Cleanup

Reviewed-on: atridad/OpenClimb#5

.github/workflows/deploy.yml

@@ -0,0 +1,38 @@
+name: OpenClimb Docker Deploy
+on:
+  push:
+    branches: [main]
+    paths:
+      - "sync/**"
+      - ".github/workflows/deploy.yml"
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ secrets.REPO_HOST }}
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.DEPLOY_TOKEN }}
+
+      - name: Build and push sync-server
+        uses: docker/build-push-action@v4
+        with:
+          context: ./sync
+          file: ./sync/Dockerfile
+          platforms: linux/amd64
+          push: true
+          tags: |
+            ${{ secrets.REPO_HOST }}/${{ github.repository_owner }}/openclimb-sync:${{ github.sha }}
+            ${{ secrets.REPO_HOST }}/${{ github.repository_owner }}/openclimb-sync:latest

.gitignore

@@ -0,0 +1,36 @@
+# Gradle files
+.gradle/
+build/
+release/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Log/OS Files
+*.log
+.DS_Store
+
+# Android Studio generated files and folders
+captures/
+.externalNativeBuild/
+.cxx/
+*.aab
+*.apk
+output-metadata.json
+
+# IntelliJ
+*.iml
+.idea/
+misc.xml
+deploymentTargetDropDown.xml
+render.experimental.xml
+
+# Keystore files
+*.jks
+*.keystore
+
+# Google Services (e.g. APIs or Firebase)
+google-services.json
+
+# Android Profiling
+*.hprof

PRIVACY.md

@@ -0,0 +1,21 @@
+# Privacy Policy
+
+**Last updated: September 29, 2025**
+
+This Privacy Policy describes our policies and procedures regarding the collection, use, and disclosure of your information when you use my software.
+
+## No Data Collection
+
+I do not collect any personal information, analytics, or data of any kind. This software is designed to be self-hosted or run entirely offline.
+
+All data generated by or used with this software remains on your local machine or self-hosted environment under your control. I have no access to it.
+
+## No Tracking or Analytics
+
+This software does not use cookies, tracking pixels, or any other analytics or tracking mechanisms. Your usage of the software is completely private.
+
+## Contact Us
+
+If you have any questions about this Privacy Policy, you can contact me:
+
+*   **By email:** me@atri.dad

README.md

@@ -1,2 +1,46 @@
 # OpenClimb
 
+This is a FOSS app meant to help climbers track their sessions, routes/problems, and overall progress. This app is offline-only and requires no special permissions to run. Its built using Jetpack Compose with Material You support on Android and SwiftUI on iOS.
+
+## Download
+
+For Android do one of the following:
+
+1. Download the latest APK from the Releases page
+2. [<img src="https://github.com/ImranR98/Obtainium/blob/main/assets/graphics/badge_obtainium.png?raw=true" alt="Obtainium" height="41">](https://apps.obtainium.imranr.dev/redirect?r=obtainium://app/%7B%22id%22%3A%22com.atridad.openclimb%22%2C%22url%22%3A%22https%3A%2F%2Fgit.atri.dad%2Fatridad%2FOpenClimb%2Freleases%22%2C%22author%22%3A%22git.atri.dad%22%2C%22name%22%3A%22OpenClimb%22%2C%22preferredApkIndex%22%3A0%2C%22additionalSettings%22%3A%22%7B%5C%22intermediateLink%5C%22%3A%5B%5D%2C%5C%22customLinkFilterRegex%5C%22%3A%5C%22%5C%22%2C%5C%22filterByLinkText%5C%22%3Afalse%2C%5C%22skipSort%5C%22%3Afalse%2C%5C%22reverseSort%5C%22%3Afalse%2C%5C%22sortByLastLinkSegment%5C%22%3Afalse%2C%5C%22versionExtractWholePage%5C%22%3Afalse%2C%5C%22requestHeader%5C%22%3A%5B%7B%5C%22requestHeader%5C%22%3A%5C%22User-Agent%3A%20Mozilla%2F5.0%20(Linux%3B%20Android%2010%3B%20K)%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F114.0.0.0%20Mobile%20Safari%2F537.36%5C%22%7D%5D%2C%5C%22defaultPseudoVersioningMethod%5C%22%3A%5C%22partialAPKHash%5C%22%2C%5C%22trackOnly%5C%22%3Afalse%2C%5C%22versionExtractionRegEx%5C%22%3A%5C%22%5C%22%2C%5C%22matchGroupToUse%5C%22%3A%5C%22%5C%22%2C%5C%22versionDetection%5C%22%3Afalse%2C%5C%22useVersionCodeAsOSVersion%5C%22%3Afalse%2C%5C%22apkFilterRegEx%5C%22%3A%5C%22%5C%22%2C%5C%22invertAPKFilter%5C%22%3Afalse%2C%5C%22autoApkFilterByArch%5C%22%3Atrue%2C%5C%22appName%5C%22%3A%5C%22OpenClimb%5C%22%2C%5C%22appAuthor%5C%22%3A%5C%22%5C%22%2C%5C%22shizukuPretendToBeGooglePlay%5C%22%3Afalse%2C%5C%22allowInsecure%5C%22%3Afalse%2C%5C%22exemptFromBackgroundUpdates%5C%22%3Afalse%2C%5C%22skipUpdateNotifications%5C%22%3Afalse%2C%5C%22about%5C%22%3A%5C%22%5C%22%2C%5C%22refreshBeforeDownload%5C%22%3Afalse%7D%22%2C%22overrideSource%22%3Anull%7D)
+
+For iOS:
+
+Download from the AppStore [here](https://apps.apple.com/ca/app/openclimb/id6752592783)!
+
+## Self-Hosted Sync Server
+
+You can run your own sync server to keep your data in sync across devices. The server is lightweight and easy to set up using Docker.
+
+### Quick Start with Docker Compose
+
+1. Create a `.env` file with your configuration:
+```
+IMAGE=git.atri.dad/atridad/openclimb-sync:latest
+APP_PORT=8080
+AUTH_TOKEN=your-secure-auth-token-here
+DATA_FILE=/data/openclimb.json
+IMAGES_DIR=/data/images
+ROOT_DIR=./openclimb-data
+```
+
+2. Use the provided `docker-compose.yml` in the `sync/` directory:
+```bash
+cd sync/
+docker-compose up -d
+```
+
+The server will be available at `http://localhost:8080`. Configure your clients with your server URL and auth token to start syncing.
+
+## Requirements
+
+- Android 12+ or iOS 17+
+
+## Contribution
+
+As this is on my private git this will be difficult to do easily. Get in touch and I can figure something out.

android/app/.gitignore

@@ -0,0 +1 @@
+/build

android/app/build.gradle.kts

@@ -0,0 +1,97 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.android)
+    alias(libs.plugins.kotlin.compose)
+    alias(libs.plugins.kotlin.serialization)
+    alias(libs.plugins.ksp)
+}
+
+android {
+    namespace = "com.atridad.openclimb"
+    compileSdk = 36
+
+    defaultConfig {
+        applicationId = "com.atridad.openclimb"
+        minSdk = 31
+        targetSdk = 36
+        versionCode = 29
+        versionName = "1.7.1"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = true
+            proguardFiles(
+                    getDefaultProguardFile("proguard-android-optimize.txt"),
+                    "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    java { toolchain { languageVersion.set(JavaLanguageVersion.of(17)) } }
+
+    buildFeatures { compose = true }
+}
+
+kotlin { compilerOptions { jvmTarget.set(JvmTarget.JVM_17) } }
+
+dependencies {
+    // Core Android libraries
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.lifecycle.runtime.ktx)
+    implementation(libs.androidx.activity.compose)
+
+    // Compose BOM and UI
+    implementation(platform(libs.androidx.compose.bom))
+    implementation(libs.androidx.ui)
+    implementation(libs.androidx.ui.graphics)
+    implementation(libs.androidx.ui.tooling.preview)
+    implementation(libs.androidx.material3)
+    implementation(libs.androidx.material.icons.extended)
+
+    // Room Database
+    implementation(libs.androidx.room.runtime)
+    implementation(libs.androidx.room.ktx)
+
+    ksp(libs.androidx.room.compiler)
+
+    // Navigation
+    implementation(libs.androidx.navigation.compose)
+
+    // ViewModel
+    implementation(libs.androidx.lifecycle.viewmodel.compose)
+
+    // Serialization
+    implementation(libs.kotlinx.serialization.json)
+
+    // Coroutines
+    implementation(libs.kotlinx.coroutines.android)
+
+    // Image Loading
+    implementation(libs.coil.compose)
+
+    // Testing
+    testImplementation(libs.junit)
+    testImplementation(libs.mockk)
+    testImplementation(libs.kotlinx.coroutines.test)
+    androidTestImplementation(libs.androidx.junit)
+    androidTestImplementation(libs.androidx.espresso.core)
+    androidTestImplementation(libs.androidx.test.core)
+    androidTestImplementation(libs.androidx.test.ext)
+    androidTestImplementation(libs.androidx.test.runner)
+    androidTestImplementation(libs.androidx.test.rules)
+    androidTestImplementation(platform(libs.androidx.compose.bom))
+    androidTestImplementation(libs.androidx.ui.test.junit4)
+    debugImplementation(libs.androidx.ui.tooling)
+    debugImplementation(libs.androidx.ui.test.manifest)
+    debugImplementation(libs.androidx.ui.tooling)
+    debugImplementation(libs.androidx.ui.test.manifest)
+}

android/app/build.gradle.kts.backup

@@ -0,0 +1,98 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.android)
+    alias(libs.plugins.kotlin.compose)
+    alias(libs.plugins.kotlin.serialization)
+    alias(libs.plugins.ksp)
+}
+
+android {
+    namespace = "com.atridad.openclimb"
+    compileSdk = 36
+
+    defaultConfig {
+        applicationId = "com.atridad.openclimb"
+        minSdk = 31
+        targetSdk = 36
+        versionCode = 27
+        versionName = "1.6.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = true
+            proguardFiles(
+                    getDefaultProguardFile("proguard-android-optimize.txt"),
+                    "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    java { toolchain { languageVersion.set(JavaLanguageVersion.of(17)) } }
+
+    buildFeatures { compose = true }
+}
+
+kotlin { compilerOptions { jvmTarget.set(JvmTarget.JVM_17) } }
+
+dependencies {
+    // Core Android libraries
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.lifecycle.runtime.ktx)
+    implementation(libs.androidx.activity.compose)
+
+    // Compose BOM and UI
+    implementation(platform(libs.androidx.compose.bom))
+    implementation(libs.androidx.ui)
+    implementation(libs.androidx.ui.graphics)
+    implementation(libs.androidx.ui.tooling.preview)
+    implementation(libs.androidx.material3)
+    implementation(libs.androidx.material.icons.extended)
+
+    // Room Database
+    implementation(libs.androidx.room.runtime)
+    implementation(libs.androidx.room.ktx)
+
+    ksp(libs.androidx.room.compiler)
+
+    // Navigation
+    implementation(libs.androidx.navigation.compose)
+
+    // ViewModel
+    implementation(libs.androidx.lifecycle.viewmodel.compose)
+
+    // Serialization
+    implementation(libs.kotlinx.serialization.json)
+
+    // Coroutines
+    implementation(libs.kotlinx.coroutines.android)
+
+    // Image Loading
+    implementation(libs.coil.compose)
+
+    // Testing
+    testImplementation(libs.junit)
+    testImplementation(libs.mockk)
+    testImplementation(libs.kotlinx.coroutines.test)
+    androidTestImplementation(libs.androidx.junit)
+    androidTestImplementation(libs.androidx.espresso.core)
+    androidTestImplementation(libs.androidx.test.core)
+    androidTestImplementation(libs.androidx.test.ext)
+    androidTestImplementation(libs.androidx.test.runner)
+    androidTestImplementation(libs.androidx.test.rules)
+    androidTestImplementation(platform(libs.androidx.compose.bom))
+    androidTestImplementation(libs.androidx.ui.test.junit4)
+    debugImplementation(libs.androidx.ui.tooling)
+    debugImplementation(libs.androidx.ui.test.manifest)
+}
+    debugImplementation(libs.androidx.ui.tooling)
+    debugImplementation(libs.androidx.ui.test.manifest)
+}

android/app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,82 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <!-- Permissions for file access and camera -->
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
+        android:maxSdkVersion="28" />
+    <uses-permission android:name="android.permission.CAMERA" />
+
+    <!-- Permission for sync functionality -->
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <!-- Hardware features -->
+    <uses-feature android:name="android.hardware.camera" android:required="false" />
+
+    <!-- Permissions for notifications and foreground service -->
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SPECIAL_USE" />
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.OpenClimb"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:label="@string/app_name"
+            android:theme="@style/Theme.OpenClimb.Splash">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+
+
+        </activity>
+
+        <!-- FileProvider for sharing images -->
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_provider_paths" />
+        </provider>
+
+        <!-- Session tracking service -->
+        <service
+            android:name=".service.SessionTrackingService"
+            android:enabled="true"
+            android:exported="false"
+            android:foregroundServiceType="specialUse"
+            android:description="@string/session_tracking_service_description">
+            <meta-data
+                android:name="android.app.foreground_service_type"
+                android:value="specialUse" />
+        </service>
+
+        <!-- Widget Provider -->
+        <receiver
+            android:name=".widget.ClimbStatsWidgetProvider"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+            </intent-filter>
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/widget_climb_stats_info" />
+        </receiver>
+    </application>
+
+</manifest>

android/app/src/main/java/com/atridad/openclimb/MainActivity.kt

@@ -0,0 +1,52 @@
+package com.atridad.openclimb
+
+import android.content.Intent
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.activity.enableEdgeToEdge
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.material3.Surface
+import androidx.compose.runtime.*
+import androidx.compose.ui.Modifier
+import com.atridad.openclimb.ui.OpenClimbApp
+import com.atridad.openclimb.ui.theme.OpenClimbTheme
+
+class MainActivity : ComponentActivity() {
+    private var shortcutAction by mutableStateOf<String?>(null)
+    private var lastUsedGymId by mutableStateOf<String?>(null)
+
+    fun clearShortcutAction() {
+        shortcutAction = null
+        lastUsedGymId = null
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setTheme(R.style.Theme_OpenClimb)
+        enableEdgeToEdge()
+
+        shortcutAction = intent?.action
+        lastUsedGymId = intent?.getStringExtra("LAST_USED_GYM_ID")
+
+        setContent {
+            OpenClimbTheme {
+                Surface(modifier = Modifier.fillMaxSize()) {
+                    OpenClimbApp(
+                            shortcutAction = shortcutAction,
+                            lastUsedGymId = lastUsedGymId,
+                            onShortcutActionProcessed = { clearShortcutAction() }
+                    )
+                }
+            }
+        }
+    }
+
+    override fun onNewIntent(intent: Intent) {
+        super.onNewIntent(intent)
+        setIntent(intent)
+
+        shortcutAction = intent.action
+        lastUsedGymId = intent.getStringExtra("LAST_USED_GYM_ID")
+    }
+}

android/app/src/main/java/com/atridad/openclimb/data/database/Converters.kt

@@ -0,0 +1,80 @@
+package com.atridad.openclimb.data.database
+
+import androidx.room.TypeConverter
+import com.atridad.openclimb.data.model.*
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+
+class Converters {
+    
+    @TypeConverter
+    fun fromClimbTypeList(value: List<ClimbType>): String {
+        return Json.encodeToString(value)
+    }
+    
+    @TypeConverter
+    fun toClimbTypeList(value: String): List<ClimbType> {
+        return Json.decodeFromString(value)
+    }
+    
+    @TypeConverter
+    fun fromDifficultySystemList(value: List<DifficultySystem>): String {
+        return Json.encodeToString(value)
+    }
+    
+    @TypeConverter
+    fun toDifficultySystemList(value: String): List<DifficultySystem> {
+        return Json.decodeFromString(value)
+    }
+    
+    @TypeConverter
+    fun fromStringList(value: List<String>): String {
+        return Json.encodeToString(value)
+    }
+    
+    @TypeConverter
+    fun toStringList(value: String): List<String> {
+        return Json.decodeFromString(value)
+    }
+    
+    @TypeConverter
+    fun fromDifficultyGrade(value: DifficultyGrade): String {
+        return Json.encodeToString(value)
+    }
+    
+    @TypeConverter
+    fun toDifficultyGrade(value: String): DifficultyGrade {
+        return Json.decodeFromString(value)
+    }
+    
+    @TypeConverter
+    fun fromClimbType(value: ClimbType): String {
+        return value.name
+    }
+    
+    @TypeConverter
+    fun toClimbType(value: String): ClimbType {
+        return ClimbType.valueOf(value)
+    }
+    
+    @TypeConverter
+    fun fromAttemptResult(value: AttemptResult): String {
+        return value.name
+    }
+    
+    @TypeConverter
+    fun toAttemptResult(value: String): AttemptResult {
+        return AttemptResult.valueOf(value)
+    }
+    
+    @TypeConverter
+    fun fromSessionStatus(value: SessionStatus): String {
+        return value.name
+    }
+    
+    @TypeConverter
+    fun toSessionStatus(value: String): SessionStatus {
+        return SessionStatus.valueOf(value)
+    }
+
+}

android/app/src/main/java/com/atridad/openclimb/data/database/OpenClimbDatabase.kt

@@ -0,0 +1,82 @@
+package com.atridad.openclimb.data.database
+
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+import androidx.room.TypeConverters
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+import android.content.Context
+import com.atridad.openclimb.data.database.dao.*
+import com.atridad.openclimb.data.model.*
+
+@Database(
+    entities = [
+        Gym::class,
+        Problem::class,
+        ClimbSession::class,
+        Attempt::class
+    ],
+    version = 5,
+    exportSchema = false
+)
+@TypeConverters(Converters::class)
+abstract class OpenClimbDatabase : RoomDatabase() {
+    
+    abstract fun gymDao(): GymDao
+    abstract fun problemDao(): ProblemDao
+    abstract fun climbSessionDao(): ClimbSessionDao
+    abstract fun attemptDao(): AttemptDao
+    
+    companion object {
+        @Volatile
+        private var INSTANCE: OpenClimbDatabase? = null
+        
+        val MIGRATION_4_5 = object : Migration(4, 5) {
+            override fun migrate(database: SupportSQLiteDatabase) {
+                val cursor = database.query("PRAGMA table_info(climb_sessions)")
+                val existingColumns = mutableSetOf<String>()
+                
+                while (cursor.moveToNext()) {
+                    val columnName = cursor.getString(cursor.getColumnIndexOrThrow("name"))
+                    existingColumns.add(columnName)
+                }
+                cursor.close()
+                
+                if (!existingColumns.contains("startTime")) {
+                    database.execSQL("ALTER TABLE climb_sessions ADD COLUMN startTime TEXT")
+                }
+                if (!existingColumns.contains("endTime")) {
+                    database.execSQL("ALTER TABLE climb_sessions ADD COLUMN endTime TEXT")
+                }
+                if (!existingColumns.contains("status")) {
+                    database.execSQL("ALTER TABLE climb_sessions ADD COLUMN status TEXT NOT NULL DEFAULT 'COMPLETED'")
+                }
+                
+                database.execSQL("UPDATE climb_sessions SET startTime = createdAt WHERE startTime IS NULL")
+                database.execSQL("UPDATE climb_sessions SET status = 'COMPLETED' WHERE status IS NULL OR status = ''")
+            }
+        }
+        
+        val MIGRATION_5_6 = object : Migration(5, 6) {
+            override fun migrate(database: SupportSQLiteDatabase) {
+            }
+        }
+        
+        fun getDatabase(context: Context): OpenClimbDatabase {
+            return INSTANCE ?: synchronized(this) {
+                val instance = Room.databaseBuilder(
+                    context.applicationContext,
+                    OpenClimbDatabase::class.java,
+                    "openclimb_database"
+                )
+                    .addMigrations(MIGRATION_4_5, MIGRATION_5_6)
+                    .enableMultiInstanceInvalidation()
+                    .fallbackToDestructiveMigration()
+                    .build()
+                INSTANCE = instance
+                instance
+            }
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/data/database/dao/AttemptDao.kt

@@ -0,0 +1,76 @@
+package com.atridad.openclimb.data.database.dao
+
+import androidx.room.*
+import com.atridad.openclimb.data.model.Attempt
+import com.atridad.openclimb.data.model.AttemptResult
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface AttemptDao {
+    
+    @Query("SELECT * FROM attempts ORDER BY timestamp DESC")
+    fun getAllAttempts(): Flow<List<Attempt>>
+    
+    @Query("SELECT * FROM attempts WHERE id = :id")
+    suspend fun getAttemptById(id: String): Attempt?
+    
+    @Query("SELECT * FROM attempts WHERE sessionId = :sessionId ORDER BY timestamp ASC")
+    fun getAttemptsBySession(sessionId: String): Flow<List<Attempt>>
+    
+    @Query("SELECT * FROM attempts WHERE problemId = :problemId ORDER BY timestamp DESC")
+    fun getAttemptsByProblem(problemId: String): Flow<List<Attempt>>
+    
+    @Query("SELECT * FROM attempts WHERE sessionId = :sessionId AND problemId = :problemId ORDER BY timestamp ASC")
+    fun getAttemptsBySessionAndProblem(sessionId: String, problemId: String): Flow<List<Attempt>>
+    
+    @Query("SELECT * FROM attempts WHERE result = :result ORDER BY timestamp DESC")
+    fun getAttemptsByResult(result: AttemptResult): Flow<List<Attempt>>
+    
+    @Query("SELECT * FROM attempts WHERE timestamp BETWEEN :startDate AND :endDate ORDER BY timestamp DESC")
+    fun getAttemptsInDateRange(startDate: String, endDate: String): Flow<List<Attempt>>
+    
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertAttempt(attempt: Attempt)
+    
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertAttempts(attempts: List<Attempt>)
+    
+    @Update
+    suspend fun updateAttempt(attempt: Attempt)
+    
+    @Delete
+    suspend fun deleteAttempt(attempt: Attempt)
+    
+    @Query("DELETE FROM attempts WHERE id = :id")
+    suspend fun deleteAttemptById(id: String)
+    
+    @Query("DELETE FROM attempts WHERE sessionId = :sessionId")
+    suspend fun deleteAttemptsBySession(sessionId: String)
+    
+    @Query("DELETE FROM attempts WHERE problemId = :problemId")
+    suspend fun deleteAttemptsByProblem(problemId: String)
+    
+    @Query("SELECT COUNT(*) FROM attempts")
+    suspend fun getAttemptsCount(): Int
+    
+    @Query("DELETE FROM attempts")
+    suspend fun deleteAllAttempts()
+    
+    @Query("SELECT COUNT(*) FROM attempts WHERE sessionId = :sessionId")
+    suspend fun getAttemptsCountBySession(sessionId: String): Int
+    
+    @Query("SELECT COUNT(*) FROM attempts WHERE problemId = :problemId")
+    suspend fun getAttemptsCountByProblem(problemId: String): Int
+    
+    @Query("SELECT COUNT(*) FROM attempts WHERE result = :result")
+    suspend fun getAttemptsCountByResult(result: AttemptResult): Int
+    
+    @Query("SELECT COUNT(*) FROM attempts WHERE problemId = :problemId AND result IN ('SUCCESS', 'FLASH', 'REDPOINT', 'ONSIGHT')")
+    suspend fun getSuccessfulAttemptsCountByProblem(problemId: String): Int
+    
+    @Query("SELECT * FROM attempts WHERE problemId = :problemId AND result IN ('SUCCESS', 'FLASH', 'REDPOINT', 'ONSIGHT') ORDER BY timestamp ASC LIMIT 1")
+    suspend fun getFirstSuccessfulAttempt(problemId: String): Attempt?
+    
+    @Query("SELECT * FROM attempts WHERE problemId = :problemId ORDER BY timestamp DESC LIMIT 1")
+    suspend fun getLatestAttemptForProblem(problemId: String): Attempt?
+}

android/app/src/main/java/com/atridad/openclimb/data/database/dao/ClimbSessionDao.kt

@@ -0,0 +1,67 @@
+package com.atridad.openclimb.data.database.dao
+
+import androidx.room.*
+import com.atridad.openclimb.data.model.ClimbSession
+import com.atridad.openclimb.data.model.SessionStatus
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface ClimbSessionDao {
+    
+    @Query("SELECT * FROM climb_sessions ORDER BY date DESC")
+    fun getAllSessions(): Flow<List<ClimbSession>>
+    
+    @Query("SELECT * FROM climb_sessions WHERE id = :id")
+    suspend fun getSessionById(id: String): ClimbSession?
+    
+    @Query("SELECT * FROM climb_sessions WHERE gymId = :gymId ORDER BY date DESC")
+    fun getSessionsByGym(gymId: String): Flow<List<ClimbSession>>
+    
+    @Query("SELECT * FROM climb_sessions WHERE date = :date ORDER BY createdAt DESC")
+    fun getSessionsByDate(date: String): Flow<List<ClimbSession>>
+    
+    @Query("SELECT * FROM climb_sessions WHERE date BETWEEN :startDate AND :endDate ORDER BY date DESC")
+    fun getSessionsInDateRange(startDate: String, endDate: String): Flow<List<ClimbSession>>
+    
+    @Query("SELECT * FROM climb_sessions ORDER BY date DESC LIMIT :limit")
+    fun getRecentSessions(limit: Int = 10): Flow<List<ClimbSession>>
+    
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertSession(session: ClimbSession)
+    
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertSessions(sessions: List<ClimbSession>)
+    
+    @Update
+    suspend fun updateSession(session: ClimbSession)
+    
+    @Delete
+    suspend fun deleteSession(session: ClimbSession)
+    
+    @Query("DELETE FROM climb_sessions WHERE id = :id")
+    suspend fun deleteSessionById(id: String)
+    
+    @Query("SELECT COUNT(*) FROM climb_sessions")
+    suspend fun getSessionsCount(): Int
+    
+    @Query("SELECT COUNT(*) FROM climb_sessions WHERE gymId = :gymId")
+    suspend fun getSessionsCountByGym(gymId: String): Int
+    
+    @Query("SELECT COUNT(*) FROM climb_sessions WHERE date BETWEEN :startDate AND :endDate")
+    suspend fun getSessionsCountInDateRange(startDate: String, endDate: String): Int
+    
+    @Query("SELECT DISTINCT date FROM climb_sessions ORDER BY date DESC")
+    suspend fun getUniqueDates(): List<String>
+    
+    @Query("SELECT * FROM climb_sessions WHERE status = :status ORDER BY date DESC")
+    fun getSessionsByStatus(status: SessionStatus): Flow<List<ClimbSession>>
+    
+    @Query("SELECT * FROM climb_sessions WHERE status = 'ACTIVE' ORDER BY date DESC LIMIT 1")
+    suspend fun getActiveSession(): ClimbSession?
+    
+    @Query("DELETE FROM climb_sessions")
+    suspend fun deleteAllSessions()
+    
+    @Query("SELECT * FROM climb_sessions WHERE status = 'ACTIVE' ORDER BY date DESC LIMIT 1")
+    fun getActiveSessionFlow(): Flow<ClimbSession?>
+}

android/app/src/main/java/com/atridad/openclimb/data/database/dao/GymDao.kt

@@ -0,0 +1,43 @@
+package com.atridad.openclimb.data.database.dao
+
+import androidx.room.*
+import com.atridad.openclimb.data.model.ClimbType
+import com.atridad.openclimb.data.model.Gym
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface GymDao {
+    
+    @Query("SELECT * FROM gyms ORDER BY name ASC")
+    fun getAllGyms(): Flow<List<Gym>>
+    
+    @Query("SELECT * FROM gyms WHERE id = :id")
+    suspend fun getGymById(id: String): Gym?
+    
+    @Query("SELECT * FROM gyms WHERE :climbType IN (supportedClimbTypes)")
+    fun getGymsByClimbType(climbType: ClimbType): Flow<List<Gym>>
+    
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertGym(gym: Gym)
+    
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertGyms(gyms: List<Gym>)
+    
+    @Update
+    suspend fun updateGym(gym: Gym)
+    
+    @Delete
+    suspend fun deleteGym(gym: Gym)
+    
+    @Query("DELETE FROM gyms WHERE id = :id")
+    suspend fun deleteGymById(id: String)
+    
+    @Query("SELECT COUNT(*) FROM gyms")
+    suspend fun getGymsCount(): Int
+    
+    @Query("SELECT * FROM gyms WHERE name LIKE '%' || :searchQuery || '%' OR location LIKE '%' || :searchQuery || '%'")
+    fun searchGyms(searchQuery: String): Flow<List<Gym>>
+    
+    @Query("DELETE FROM gyms")
+    suspend fun deleteAllGyms()
+}

android/app/src/main/java/com/atridad/openclimb/data/database/dao/ProblemDao.kt

@@ -0,0 +1,64 @@
+package com.atridad.openclimb.data.database.dao
+
+import androidx.room.*
+import com.atridad.openclimb.data.model.ClimbType
+import com.atridad.openclimb.data.model.Problem
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface ProblemDao {
+
+    @Query("SELECT * FROM problems ORDER BY updatedAt DESC")
+    fun getAllProblems(): Flow<List<Problem>>
+
+    @Query("SELECT * FROM problems WHERE id = :id") suspend fun getProblemById(id: String): Problem?
+
+    @Query("SELECT * FROM problems WHERE gymId = :gymId ORDER BY updatedAt DESC")
+    fun getProblemsByGym(gymId: String): Flow<List<Problem>>
+
+    @Query("SELECT * FROM problems WHERE climbType = :climbType ORDER BY updatedAt DESC")
+    fun getProblemsByClimbType(climbType: ClimbType): Flow<List<Problem>>
+
+    @Query(
+            "SELECT * FROM problems WHERE gymId = :gymId AND climbType = :climbType ORDER BY updatedAt DESC"
+    )
+    fun getProblemsByGymAndType(gymId: String, climbType: ClimbType): Flow<List<Problem>>
+
+    @Query("SELECT * FROM problems WHERE isActive = 1 ORDER BY updatedAt DESC")
+    fun getActiveProblems(): Flow<List<Problem>>
+
+    @Query("SELECT * FROM problems WHERE gymId = :gymId AND isActive = 1 ORDER BY updatedAt DESC")
+    fun getActiveProblemsByGym(gymId: String): Flow<List<Problem>>
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE) suspend fun insertProblem(problem: Problem)
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertProblems(problems: List<Problem>)
+
+    @Update suspend fun updateProblem(problem: Problem)
+
+    @Delete suspend fun deleteProblem(problem: Problem)
+
+    @Query("DELETE FROM problems WHERE id = :id") suspend fun deleteProblemById(id: String)
+
+    @Query("SELECT COUNT(*) FROM problems WHERE gymId = :gymId")
+    suspend fun getProblemsCountByGym(gymId: String): Int
+
+    @Query("SELECT COUNT(*) FROM problems WHERE isActive = 1")
+    suspend fun getActiveProblemsCount(): Int
+
+    @Query(
+            """
+        SELECT * FROM problems
+        WHERE (name LIKE '%' || :searchQuery || '%'
+        OR description LIKE '%' || :searchQuery || '%'
+        OR location LIKE '%' || :searchQuery || '%')
+        ORDER BY updatedAt DESC
+    """
+    )
+    fun searchProblems(searchQuery: String): Flow<List<Problem>>
+
+    @Query("SELECT COUNT(*) FROM problems") suspend fun getProblemsCount(): Int
+
+    @Query("DELETE FROM problems") suspend fun deleteAllProblems()
+}

android/app/src/main/java/com/atridad/openclimb/data/format/BackupFormat.kt

@@ -0,0 +1,230 @@
+package com.atridad.openclimb.data.format
+
+import com.atridad.openclimb.data.model.*
+import kotlinx.serialization.Serializable
+
+// Root structure for OpenClimb backup data
+@Serializable
+data class ClimbDataBackup(
+        val exportedAt: String,
+        val version: String = "2.0",
+        val formatVersion: String = "2.0",
+        val gyms: List<BackupGym>,
+        val problems: List<BackupProblem>,
+        val sessions: List<BackupClimbSession>,
+        val attempts: List<BackupAttempt>
+)
+
+// Platform-neutral gym representation for backup/restore
+@Serializable
+data class BackupGym(
+        val id: String,
+        val name: String,
+        val location: String? = null,
+        val supportedClimbTypes: List<ClimbType>,
+        val difficultySystems: List<DifficultySystem>,
+        @kotlinx.serialization.SerialName("customDifficultyGrades")
+        val customDifficultyGrades: List<String> = emptyList(),
+        val notes: String? = null,
+        val createdAt: String,
+        val updatedAt: String
+) {
+    companion object {
+        /** Create BackupGym from native Android Gym model */
+        fun fromGym(gym: Gym): BackupGym {
+            return BackupGym(
+                    id = gym.id,
+                    name = gym.name,
+                    location = gym.location,
+                    supportedClimbTypes = gym.supportedClimbTypes,
+                    difficultySystems = gym.difficultySystems,
+                    customDifficultyGrades = gym.customDifficultyGrades,
+                    notes = gym.notes,
+                    createdAt = gym.createdAt,
+                    updatedAt = gym.updatedAt
+            )
+        }
+    }
+
+    /** Convert to native Android Gym model */
+    fun toGym(): Gym {
+        return Gym(
+                id = id,
+                name = name,
+                location = location,
+                supportedClimbTypes = supportedClimbTypes,
+                difficultySystems = difficultySystems,
+                customDifficultyGrades = customDifficultyGrades,
+                notes = notes,
+                createdAt = createdAt,
+                updatedAt = updatedAt
+        )
+    }
+}
+
+// Platform-neutral problem representation for backup/restore
+@Serializable
+data class BackupProblem(
+        val id: String,
+        val gymId: String,
+        val name: String? = null,
+        val description: String? = null,
+        val climbType: ClimbType,
+        val difficulty: DifficultyGrade,
+        val tags: List<String> = emptyList(),
+        val location: String? = null,
+        val imagePaths: List<String>? = null,
+        val isActive: Boolean = true,
+        val dateSet: String? = null,
+        val notes: String? = null,
+        val createdAt: String,
+        val updatedAt: String
+) {
+    companion object {
+        /** Create BackupProblem from native Android Problem model */
+        fun fromProblem(problem: Problem): BackupProblem {
+            return BackupProblem(
+                    id = problem.id,
+                    gymId = problem.gymId,
+                    name = problem.name,
+                    description = problem.description,
+                    climbType = problem.climbType,
+                    difficulty = problem.difficulty,
+                    tags = problem.tags,
+                    location = problem.location,
+                    imagePaths =
+                            if (problem.imagePaths.isEmpty()) null
+                            else problem.imagePaths.map { path -> path.substringAfterLast('/') },
+                    isActive = problem.isActive,
+                    dateSet = problem.dateSet,
+                    notes = problem.notes,
+                    createdAt = problem.createdAt,
+                    updatedAt = problem.updatedAt
+            )
+        }
+    }
+
+    /** Convert to native Android Problem model */
+    fun toProblem(): Problem {
+        return Problem(
+                id = id,
+                gymId = gymId,
+                name = name,
+                description = description,
+                climbType = climbType,
+                difficulty = difficulty,
+                tags = tags,
+                location = location,
+                imagePaths = imagePaths ?: emptyList(),
+                isActive = isActive,
+                dateSet = dateSet,
+                notes = notes,
+                createdAt = createdAt,
+                updatedAt = updatedAt
+        )
+    }
+
+    /** Create a copy with updated image paths for import processing */
+    fun withUpdatedImagePaths(newImagePaths: List<String>): BackupProblem {
+        return copy(imagePaths = newImagePaths.ifEmpty { null })
+    }
+}
+
+// Platform-neutral climb session representation for backup/restore
+@Serializable
+data class BackupClimbSession(
+        val id: String,
+        val gymId: String,
+        val date: String,
+        val startTime: String? = null,
+        val endTime: String? = null,
+        val duration: Long? = null,
+        val status: SessionStatus,
+        val notes: String? = null,
+        val createdAt: String,
+        val updatedAt: String
+) {
+    companion object {
+        /** Create BackupClimbSession from native Android ClimbSession model */
+        fun fromClimbSession(session: ClimbSession): BackupClimbSession {
+            return BackupClimbSession(
+                    id = session.id,
+                    gymId = session.gymId,
+                    date = session.date,
+                    startTime = session.startTime,
+                    endTime = session.endTime,
+                    duration = session.duration,
+                    status = session.status,
+                    notes = session.notes,
+                    createdAt = session.createdAt,
+                    updatedAt = session.updatedAt
+            )
+        }
+    }
+
+    /** Convert to native Android ClimbSession model */
+    fun toClimbSession(): ClimbSession {
+        return ClimbSession(
+                id = id,
+                gymId = gymId,
+                date = date,
+                startTime = startTime,
+                endTime = endTime,
+                duration = duration,
+                status = status,
+                notes = notes,
+                createdAt = createdAt,
+                updatedAt = updatedAt
+        )
+    }
+}
+
+// Platform-neutral attempt representation for backup/restore
+@Serializable
+data class BackupAttempt(
+        val id: String,
+        val sessionId: String,
+        val problemId: String,
+        val result: AttemptResult,
+        val highestHold: String? = null,
+        val notes: String? = null,
+        val duration: Long? = null,
+        val restTime: Long? = null,
+        val timestamp: String,
+        val createdAt: String,
+        val updatedAt: String
+) {
+    companion object {
+        /** Create BackupAttempt from native Android Attempt model */
+        fun fromAttempt(attempt: Attempt): BackupAttempt {
+            return BackupAttempt(
+                    id = attempt.id,
+                    sessionId = attempt.sessionId,
+                    problemId = attempt.problemId,
+                    result = attempt.result,
+                    highestHold = attempt.highestHold,
+                    notes = attempt.notes,
+                    duration = attempt.duration,
+                    restTime = attempt.restTime,
+                    timestamp = attempt.timestamp,
+                    createdAt = attempt.createdAt
+            )
+        }
+    }
+
+    /** Convert to native Android Attempt model */
+    fun toAttempt(): Attempt {
+        return Attempt(
+                id = id,
+                sessionId = sessionId,
+                problemId = problemId,
+                result = result,
+                highestHold = highestHold,
+                notes = notes,
+                duration = duration,
+                restTime = restTime,
+                timestamp = timestamp,
+                createdAt = createdAt
+        )
+    }
+}

android/app/src/main/java/com/atridad/openclimb/data/migration/ImageMigrationService.kt

@@ -0,0 +1,205 @@
+package com.atridad.openclimb.data.migration
+
+import android.content.Context
+import android.util.Log
+import com.atridad.openclimb.data.repository.ClimbRepository
+import com.atridad.openclimb.utils.ImageNamingUtils
+import com.atridad.openclimb.utils.ImageUtils
+import kotlinx.coroutines.flow.first
+
+/**
+ * Service responsible for migrating images to use consistent naming convention across platforms.
+ * This ensures that iOS and Android use the same image filenames for sync compatibility.
+ */
+class ImageMigrationService(private val context: Context, private val repository: ClimbRepository) {
+    companion object {
+        private const val TAG = "ImageMigrationService"
+        private const val MIGRATION_PREF_KEY = "image_naming_migration_completed"
+    }
+
+    /**
+     * Performs a complete migration of all images in the system to use consistent naming. This
+     * should be called once during app startup after the naming convention is implemented.
+     */
+    suspend fun performFullMigration(): ImageMigrationResult {
+        Log.i(TAG, "Starting full image naming migration")
+
+        val prefs = context.getSharedPreferences("openclimb_migration", Context.MODE_PRIVATE)
+        if (prefs.getBoolean(MIGRATION_PREF_KEY, false)) {
+            Log.i(TAG, "Image migration already completed, skipping")
+            return ImageMigrationResult.AlreadyCompleted
+        }
+
+        try {
+            val allProblems = repository.getAllProblems().first()
+            val migrationResults = mutableMapOf<String, String>()
+            var migratedCount = 0
+            var errorCount = 0
+
+            Log.i(TAG, "Found ${allProblems.size} problems to check for image migration")
+
+            for (problem in allProblems) {
+                if (problem.imagePaths.isNotEmpty()) {
+                    Log.d(
+                            TAG,
+                            "Migrating images for problem '${problem.name}': ${problem.imagePaths}"
+                    )
+
+                    try {
+                        val problemMigrations =
+                                ImageUtils.migrateImageNaming(
+                                        context = context,
+                                        problemId = problem.id,
+                                        currentImagePaths = problem.imagePaths
+                                )
+
+                        if (problemMigrations.isNotEmpty()) {
+                            migrationResults.putAll(problemMigrations)
+                            migratedCount += problemMigrations.size
+
+                            // Update image paths
+                            val newImagePaths =
+                                    problem.imagePaths.map { oldPath ->
+                                        problemMigrations[oldPath] ?: oldPath
+                                    }
+
+                            val updatedProblem = problem.copy(imagePaths = newImagePaths)
+                            repository.insertProblem(updatedProblem)
+
+                            Log.d(
+                                    TAG,
+                                    "Updated problem '${problem.name}' with ${problemMigrations.size} migrated images"
+                            )
+                        }
+                    } catch (e: Exception) {
+                        Log.e(
+                                TAG,
+                                "Failed to migrate images for problem '${problem.name}': ${e.message}",
+                                e
+                        )
+                        errorCount++
+                    }
+                }
+            }
+
+            // Mark migration as completed
+            prefs.edit().putBoolean(MIGRATION_PREF_KEY, true).apply()
+
+            Log.i(
+                    TAG,
+                    "Image migration completed: $migratedCount images migrated, $errorCount errors"
+            )
+
+            return ImageMigrationResult.Success(
+                    totalMigrated = migratedCount,
+                    errors = errorCount,
+                    migrations = migrationResults
+            )
+        } catch (e: Exception) {
+            Log.e(TAG, "Image migration failed: ${e.message}", e)
+            return ImageMigrationResult.Failed(e.message ?: "Unknown error")
+        }
+    }
+
+    /** Validates that all images in the system follow the consistent naming convention. */
+    suspend fun validateImageNaming(): ValidationResult {
+        try {
+            val allProblems = repository.getAllProblems().first()
+            val validImages = mutableListOf<String>()
+            val invalidImages = mutableListOf<String>()
+            val missingImages = mutableListOf<String>()
+
+            for (problem in allProblems) {
+                for (imagePath in problem.imagePaths) {
+                    val filename = imagePath.substringAfterLast('/')
+
+                    // Check if file exists
+                    val imageFile = ImageUtils.getImageFile(context, imagePath)
+                    if (!imageFile.exists()) {
+                        missingImages.add(imagePath)
+                        continue
+                    }
+
+                    // Check if filename follows convention
+                    if (ImageNamingUtils.isValidImageFilename(filename)) {
+                        validImages.add(imagePath)
+                    } else {
+                        invalidImages.add(imagePath)
+                    }
+                }
+            }
+
+            return ValidationResult(
+                    totalImages = validImages.size + invalidImages.size + missingImages.size,
+                    validImages = validImages,
+                    invalidImages = invalidImages,
+                    missingImages = missingImages
+            )
+        } catch (e: Exception) {
+            Log.e(TAG, "Image validation failed: ${e.message}", e)
+            return ValidationResult(
+                    totalImages = 0,
+                    validImages = emptyList(),
+                    invalidImages = emptyList(),
+                    missingImages = emptyList()
+            )
+        }
+    }
+
+    /** Migrates images for a specific problem during sync operations. */
+    suspend fun migrateProblemImages(
+            problemId: String,
+            currentImagePaths: List<String>
+    ): Map<String, String> {
+        return try {
+            ImageUtils.migrateImageNaming(context, problemId, currentImagePaths)
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to migrate images for problem $problemId: ${e.message}", e)
+            emptyMap()
+        }
+    }
+
+    /**
+     * Cleans up any orphaned image files that don't follow our naming convention and aren't
+     * referenced by any problems.
+     */
+    suspend fun cleanupOrphanedImages() {
+        try {
+            val allProblems = repository.getAllProblems().first()
+            val referencedPaths = allProblems.flatMap { it.imagePaths }.toSet()
+
+            ImageUtils.cleanupOrphanedImages(context, referencedPaths)
+
+            Log.i(TAG, "Orphaned image cleanup completed")
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to cleanup orphaned images: ${e.message}", e)
+        }
+    }
+}
+
+/** Result of an image migration operation */
+sealed class ImageMigrationResult {
+    object AlreadyCompleted : ImageMigrationResult()
+
+    data class Success(
+            val totalMigrated: Int,
+            val errors: Int,
+            val migrations: Map<String, String>
+    ) : ImageMigrationResult()
+
+    data class Failed(val error: String) : ImageMigrationResult()
+}
+
+/** Result of image naming validation */
+data class ValidationResult(
+        val totalImages: Int,
+        val validImages: List<String>,
+        val invalidImages: List<String>,
+        val missingImages: List<String>
+) {
+    val isAllValid: Boolean
+        get() = invalidImages.isEmpty() && missingImages.isEmpty()
+
+    val validPercentage: Double
+        get() = if (totalImages == 0) 100.0 else (validImages.size.toDouble() / totalImages) * 100
+}

android/app/src/main/java/com/atridad/openclimb/data/model/Attempt.kt

@@ -0,0 +1,75 @@
+package com.atridad.openclimb.data.model
+
+import androidx.room.Entity
+import androidx.room.ForeignKey
+import androidx.room.Index
+import androidx.room.PrimaryKey
+import com.atridad.openclimb.utils.DateFormatUtils
+import kotlinx.serialization.Serializable
+
+@Serializable
+enum class AttemptResult {
+    SUCCESS,
+    FALL,
+    NO_PROGRESS,
+    FLASH,
+}
+
+@Entity(
+        tableName = "attempts",
+        foreignKeys =
+                [
+                        ForeignKey(
+                                entity = ClimbSession::class,
+                                parentColumns = ["id"],
+                                childColumns = ["sessionId"],
+                                onDelete = ForeignKey.CASCADE
+                        ),
+                        ForeignKey(
+                                entity = Problem::class,
+                                parentColumns = ["id"],
+                                childColumns = ["problemId"],
+                                onDelete = ForeignKey.CASCADE
+                        )],
+        indices = [Index(value = ["sessionId"]), Index(value = ["problemId"])]
+)
+@Serializable
+data class Attempt(
+        @PrimaryKey val id: String,
+        val sessionId: String,
+        val problemId: String,
+        val result: AttemptResult,
+        val highestHold: String? = null,
+        val notes: String? = null,
+        val duration: Long? = null,
+        val restTime: Long? = null,
+        val timestamp: String,
+        val createdAt: String
+) {
+    companion object {
+        fun create(
+                sessionId: String,
+                problemId: String,
+                result: AttemptResult,
+                highestHold: String? = null,
+                notes: String? = null,
+                duration: Long? = null,
+                restTime: Long? = null,
+                timestamp: String = DateFormatUtils.nowISO8601()
+        ): Attempt {
+            val now = DateFormatUtils.nowISO8601()
+            return Attempt(
+                    id = java.util.UUID.randomUUID().toString(),
+                    sessionId = sessionId,
+                    problemId = problemId,
+                    result = result,
+                    highestHold = highestHold,
+                    notes = notes,
+                    duration = duration,
+                    restTime = restTime,
+                    timestamp = timestamp,
+                    createdAt = now
+            )
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/data/model/ClimbSession.kt

@@ -0,0 +1,80 @@
+package com.atridad.openclimb.data.model
+
+import androidx.room.Entity
+import androidx.room.ForeignKey
+import androidx.room.Index
+import androidx.room.PrimaryKey
+import com.atridad.openclimb.utils.DateFormatUtils
+import kotlinx.serialization.Serializable
+
+@Serializable
+enum class SessionStatus {
+    ACTIVE,
+    COMPLETED,
+    PAUSED
+}
+
+@Entity(
+        tableName = "climb_sessions",
+        foreignKeys =
+                [
+                        ForeignKey(
+                                entity = Gym::class,
+                                parentColumns = ["id"],
+                                childColumns = ["gymId"],
+                                onDelete = ForeignKey.CASCADE
+                        )],
+        indices = [Index(value = ["gymId"])]
+)
+@Serializable
+data class ClimbSession(
+        @PrimaryKey val id: String,
+        val gymId: String,
+        val date: String,
+        val startTime: String? = null,
+        val endTime: String? = null,
+        val duration: Long? = null,
+        val status: SessionStatus = SessionStatus.ACTIVE,
+        val notes: String? = null,
+        val createdAt: String,
+        val updatedAt: String
+) {
+    companion object {
+        fun create(gymId: String, notes: String? = null): ClimbSession {
+            val now = DateFormatUtils.nowISO8601()
+            return ClimbSession(
+                    id = java.util.UUID.randomUUID().toString(),
+                    gymId = gymId,
+                    date = now,
+                    startTime = now,
+                    status = SessionStatus.ACTIVE,
+                    notes = notes,
+                    createdAt = now,
+                    updatedAt = now
+            )
+        }
+
+        fun ClimbSession.complete(): ClimbSession {
+            val endTime = DateFormatUtils.nowISO8601()
+            val durationMinutes =
+                    if (startTime != null) {
+                        try {
+                            val start = DateFormatUtils.parseISO8601(startTime)
+                            val end = DateFormatUtils.parseISO8601(endTime)
+                            if (start != null && end != null) {
+                                java.time.Duration.between(start, end).toMinutes()
+                            } else null
+                        } catch (_: Exception) {
+                            null
+                        }
+                    } else null
+
+            return this.copy(
+                    endTime = endTime,
+                    duration = durationMinutes,
+                    status = SessionStatus.COMPLETED,
+                    updatedAt = DateFormatUtils.nowISO8601()
+            )
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/data/model/ClimbType.kt

@@ -0,0 +1,17 @@
+package com.atridad.openclimb.data.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+enum class ClimbType {
+    ROPE,
+    BOULDER;
+    
+    /**
+     * Get the display name
+     */
+    fun getDisplayName(): String = when (this) {
+        ROPE -> "Rope"
+        BOULDER -> "Bouldering"
+    }
+}

android/app/src/main/java/com/atridad/openclimb/data/model/DifficultySystem.kt

@@ -0,0 +1,224 @@
+package com.atridad.openclimb.data.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+enum class DifficultySystem {
+    // Bouldering
+    V_SCALE,
+    FONT,
+
+    // Rope
+    YDS,
+    CUSTOM;
+
+    /** Get the display name for the UI */
+    fun getDisplayName(): String =
+            when (this) {
+                V_SCALE -> "V Scale"
+                FONT -> "Font Scale"
+                YDS -> "YDS (Yosemite)"
+                CUSTOM -> "Custom"
+            }
+
+    /** Check if this system is for bouldering */
+    fun isBoulderingSystem(): Boolean =
+            when (this) {
+                V_SCALE, FONT -> true
+                YDS -> false
+                CUSTOM -> true
+            }
+
+    /** Check if this system is for rope climbing */
+    fun isRopeSystem(): Boolean =
+            when (this) {
+                YDS -> true
+                V_SCALE, FONT -> false
+                CUSTOM -> true
+            }
+
+    /** Get available grades for this system */
+    fun getAvailableGrades(): List<String> =
+            when (this) {
+                V_SCALE ->
+                        listOf(
+                                "VB",
+                                "V0",
+                                "V1",
+                                "V2",
+                                "V3",
+                                "V4",
+                                "V5",
+                                "V6",
+                                "V7",
+                                "V8",
+                                "V9",
+                                "V10",
+                                "V11",
+                                "V12",
+                                "V13",
+                                "V14",
+                                "V15",
+                                "V16",
+                                "V17"
+                        )
+                FONT ->
+                        listOf(
+                                "3",
+                                "4A",
+                                "4B",
+                                "4C",
+                                "5A",
+                                "5B",
+                                "5C",
+                                "6A",
+                                "6A+",
+                                "6B",
+                                "6B+",
+                                "6C",
+                                "6C+",
+                                "7A",
+                                "7A+",
+                                "7B",
+                                "7B+",
+                                "7C",
+                                "7C+",
+                                "8A",
+                                "8A+",
+                                "8B",
+                                "8B+",
+                                "8C",
+                                "8C+"
+                        )
+                YDS ->
+                        listOf(
+                                "5.0",
+                                "5.1",
+                                "5.2",
+                                "5.3",
+                                "5.4",
+                                "5.5",
+                                "5.6",
+                                "5.7",
+                                "5.8",
+                                "5.9",
+                                "5.10a",
+                                "5.10b",
+                                "5.10c",
+                                "5.10d",
+                                "5.11a",
+                                "5.11b",
+                                "5.11c",
+                                "5.11d",
+                                "5.12a",
+                                "5.12b",
+                                "5.12c",
+                                "5.12d",
+                                "5.13a",
+                                "5.13b",
+                                "5.13c",
+                                "5.13d",
+                                "5.14a",
+                                "5.14b",
+                                "5.14c",
+                                "5.14d",
+                                "5.15a",
+                                "5.15b",
+                                "5.15c",
+                                "5.15d"
+                        )
+                CUSTOM -> emptyList()
+            }
+
+    companion object {
+        /** Get all difficulty systems based on type */
+        fun getSystemsForClimbType(climbType: ClimbType): List<DifficultySystem> =
+                when (climbType) {
+                    ClimbType.BOULDER -> entries.filter { it.isBoulderingSystem() }
+                    ClimbType.ROPE -> entries.filter { it.isRopeSystem() }
+                }
+    }
+}
+
+@Serializable
+data class DifficultyGrade(val system: DifficultySystem, val grade: String, val numericValue: Int) {
+
+    constructor(
+            system: DifficultySystem,
+            grade: String
+    ) : this(system = system, grade = grade, numericValue = calculateNumericValue(system, grade))
+
+    companion object {
+        private fun calculateNumericValue(system: DifficultySystem, grade: String): Int {
+            return when (system) {
+                DifficultySystem.V_SCALE -> {
+                    if (grade == "VB") 0 else grade.removePrefix("V").toIntOrNull() ?: 0
+                }
+                DifficultySystem.YDS -> {
+                    when {
+                        grade.startsWith("5.10") ->
+                                10 + (grade.getOrNull(4)?.toString()?.hashCode()?.rem(4) ?: 0)
+                        grade.startsWith("5.11") ->
+                                14 + (grade.getOrNull(4)?.toString()?.hashCode()?.rem(4) ?: 0)
+                        grade.startsWith("5.12") ->
+                                18 + (grade.getOrNull(4)?.toString()?.hashCode()?.rem(4) ?: 0)
+                        grade.startsWith("5.13") ->
+                                22 + (grade.getOrNull(4)?.toString()?.hashCode()?.rem(4) ?: 0)
+                        grade.startsWith("5.14") ->
+                                26 + (grade.getOrNull(4)?.toString()?.hashCode()?.rem(4) ?: 0)
+                        grade.startsWith("5.15") ->
+                                30 + (grade.getOrNull(4)?.toString()?.hashCode()?.rem(4) ?: 0)
+                        else -> grade.removePrefix("5.").toIntOrNull() ?: 0
+                    }
+                }
+                DifficultySystem.FONT -> {
+                    when {
+                        grade.startsWith("6A") -> 6
+                        grade.startsWith("6B") -> 7
+                        grade.startsWith("6C") -> 8
+                        grade.startsWith("7A") -> 9
+                        grade.startsWith("7B") -> 10
+                        grade.startsWith("7C") -> 11
+                        grade.startsWith("8A") -> 12
+                        grade.startsWith("8B") -> 13
+                        grade.startsWith("8C") -> 14
+                        else -> grade.toIntOrNull() ?: 0
+                    }
+                }
+                DifficultySystem.CUSTOM -> grade.hashCode().rem(100)
+            }
+        }
+    }
+    /**
+     * Compare this grade with another grade of the same system Returns negative if this grade is
+     * easier, positive if harder, 0 if equal
+     */
+    fun compareTo(other: DifficultyGrade): Int {
+        if (system != other.system) return 0
+
+        return when (system) {
+            DifficultySystem.V_SCALE -> compareVScaleGrades(grade, other.grade)
+            DifficultySystem.FONT -> compareFontGrades(grade, other.grade)
+            DifficultySystem.YDS -> compareYDSGrades(grade, other.grade)
+            DifficultySystem.CUSTOM -> grade.compareTo(other.grade)
+        }
+    }
+
+    private fun compareVScaleGrades(grade1: String, grade2: String): Int {
+        if (grade1 == "VB" && grade2 != "VB") return -1
+        if (grade2 == "VB" && grade1 != "VB") return 1
+        if (grade1 == "VB" && grade2 == "VB") return 0
+
+        val num1 = grade1.removePrefix("V").toIntOrNull() ?: 0
+        val num2 = grade2.removePrefix("V").toIntOrNull() ?: 0
+        return num1.compareTo(num2)
+    }
+
+    private fun compareFontGrades(grade1: String, grade2: String): Int {
+        return grade1.compareTo(grade2)
+    }
+
+    private fun compareYDSGrades(grade1: String, grade2: String): Int {
+        return grade1.compareTo(grade2)
+    }
+}

android/app/src/main/java/com/atridad/openclimb/data/model/Gym.kt

@@ -0,0 +1,44 @@
+package com.atridad.openclimb.data.model
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+import com.atridad.openclimb.utils.DateFormatUtils
+import kotlinx.serialization.Serializable
+
+@Entity(tableName = "gyms")
+@Serializable
+data class Gym(
+        @PrimaryKey val id: String,
+        val name: String,
+        val location: String? = null,
+        val supportedClimbTypes: List<ClimbType>,
+        val difficultySystems: List<DifficultySystem>,
+        val customDifficultyGrades: List<String> = emptyList(),
+        val notes: String? = null,
+        val createdAt: String,
+        val updatedAt: String
+) {
+    companion object {
+        fun create(
+                name: String,
+                location: String? = null,
+                supportedClimbTypes: List<ClimbType>,
+                difficultySystems: List<DifficultySystem>,
+                customDifficultyGrades: List<String> = emptyList(),
+                notes: String? = null
+        ): Gym {
+            val now = DateFormatUtils.nowISO8601()
+            return Gym(
+                    id = java.util.UUID.randomUUID().toString(),
+                    name = name,
+                    location = location,
+                    supportedClimbTypes = supportedClimbTypes,
+                    difficultySystems = difficultySystems,
+                    customDifficultyGrades = customDifficultyGrades,
+                    notes = notes,
+                    createdAt = now,
+                    updatedAt = now
+            )
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/data/model/Problem.kt

@@ -0,0 +1,71 @@
+package com.atridad.openclimb.data.model
+
+import androidx.room.Entity
+import androidx.room.ForeignKey
+import androidx.room.Index
+import androidx.room.PrimaryKey
+import com.atridad.openclimb.utils.DateFormatUtils
+import kotlinx.serialization.Serializable
+
+@Entity(
+        tableName = "problems",
+        foreignKeys =
+                [
+                        ForeignKey(
+                                entity = Gym::class,
+                                parentColumns = ["id"],
+                                childColumns = ["gymId"],
+                                onDelete = ForeignKey.CASCADE
+                        )],
+        indices = [Index(value = ["gymId"])]
+)
+@Serializable
+data class Problem(
+        @PrimaryKey val id: String,
+        val gymId: String,
+        val name: String? = null,
+        val description: String? = null,
+        val climbType: ClimbType,
+        val difficulty: DifficultyGrade,
+        val tags: List<String> = emptyList(),
+        val location: String? = null,
+        val imagePaths: List<String> = emptyList(),
+        val isActive: Boolean = true,
+        val dateSet: String? = null,
+        val notes: String? = null,
+        val createdAt: String,
+        val updatedAt: String
+) {
+    companion object {
+        fun create(
+                gymId: String,
+                name: String? = null,
+                description: String? = null,
+                climbType: ClimbType,
+                difficulty: DifficultyGrade,
+                tags: List<String> = emptyList(),
+                location: String? = null,
+                imagePaths: List<String> = emptyList(),
+                dateSet: String? = null,
+                notes: String? = null
+        ): Problem {
+            val now = DateFormatUtils.nowISO8601()
+            return Problem(
+                    id = java.util.UUID.randomUUID().toString(),
+                    gymId = gymId,
+                    name = name,
+                    description = description,
+                    climbType = climbType,
+                    difficulty = difficulty,
+                    tags = tags,
+                    location = location,
+                    imagePaths = imagePaths,
+                    isActive = true,
+                    dateSet = dateSet,
+                    notes = notes,
+                    createdAt = now,
+                    updatedAt = now
+            )
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/data/repository/ClimbRepository.kt

@@ -0,0 +1,362 @@
+package com.atridad.openclimb.data.repository
+
+import android.content.Context
+import com.atridad.openclimb.data.database.OpenClimbDatabase
+import com.atridad.openclimb.data.format.BackupAttempt
+import com.atridad.openclimb.data.format.BackupClimbSession
+import com.atridad.openclimb.data.format.BackupGym
+import com.atridad.openclimb.data.format.BackupProblem
+import com.atridad.openclimb.data.format.ClimbDataBackup
+import com.atridad.openclimb.data.model.*
+import com.atridad.openclimb.data.state.DataStateManager
+import com.atridad.openclimb.utils.DateFormatUtils
+import com.atridad.openclimb.utils.ZipExportImportUtils
+import java.io.File
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.first
+import kotlinx.serialization.json.Json
+
+class ClimbRepository(database: OpenClimbDatabase, private val context: Context) {
+    private val gymDao = database.gymDao()
+    private val problemDao = database.problemDao()
+    private val sessionDao = database.climbSessionDao()
+    private val attemptDao = database.attemptDao()
+    private val dataStateManager = DataStateManager(context)
+
+    private var autoSyncCallback: (() -> Unit)? = null
+
+    private val json = Json {
+        prettyPrint = true
+        ignoreUnknownKeys = true
+    }
+
+    // Gym operations
+    fun getAllGyms(): Flow<List<Gym>> = gymDao.getAllGyms()
+    suspend fun getGymById(id: String): Gym? = gymDao.getGymById(id)
+    suspend fun insertGym(gym: Gym) {
+        gymDao.insertGym(gym)
+        dataStateManager.updateDataState()
+        triggerAutoSync()
+    }
+    suspend fun updateGym(gym: Gym) {
+        gymDao.updateGym(gym)
+        dataStateManager.updateDataState()
+        triggerAutoSync()
+    }
+    suspend fun deleteGym(gym: Gym) {
+        gymDao.deleteGym(gym)
+        dataStateManager.updateDataState()
+        triggerAutoSync()
+    }
+
+    // Problem operations
+    fun getAllProblems(): Flow<List<Problem>> = problemDao.getAllProblems()
+    suspend fun getProblemById(id: String): Problem? = problemDao.getProblemById(id)
+    fun getProblemsByGym(gymId: String): Flow<List<Problem>> = problemDao.getProblemsByGym(gymId)
+    suspend fun insertProblem(problem: Problem) {
+        problemDao.insertProblem(problem)
+        dataStateManager.updateDataState()
+        triggerAutoSync()
+    }
+    suspend fun updateProblem(problem: Problem) {
+        problemDao.updateProblem(problem)
+        dataStateManager.updateDataState()
+        triggerAutoSync()
+    }
+    suspend fun deleteProblem(problem: Problem) {
+        problemDao.deleteProblem(problem)
+        dataStateManager.updateDataState()
+        triggerAutoSync()
+    }
+
+    // Session operations
+    fun getAllSessions(): Flow<List<ClimbSession>> = sessionDao.getAllSessions()
+    suspend fun getSessionById(id: String): ClimbSession? = sessionDao.getSessionById(id)
+    fun getSessionsByGym(gymId: String): Flow<List<ClimbSession>> =
+            sessionDao.getSessionsByGym(gymId)
+    suspend fun getActiveSession(): ClimbSession? = sessionDao.getActiveSession()
+    fun getActiveSessionFlow(): Flow<ClimbSession?> = sessionDao.getActiveSessionFlow()
+    suspend fun insertSession(session: ClimbSession) {
+        sessionDao.insertSession(session)
+        dataStateManager.updateDataState()
+        triggerAutoSync()
+    }
+    suspend fun updateSession(session: ClimbSession) {
+        sessionDao.updateSession(session)
+        dataStateManager.updateDataState()
+        triggerAutoSync()
+    }
+    suspend fun deleteSession(session: ClimbSession) {
+        sessionDao.deleteSession(session)
+        dataStateManager.updateDataState()
+        triggerAutoSync()
+    }
+    suspend fun getLastUsedGym(): Gym? {
+        val recentSessions = sessionDao.getRecentSessions(1).first()
+        return if (recentSessions.isNotEmpty()) {
+            getGymById(recentSessions.first().gymId)
+        } else {
+            null
+        }
+    }
+
+    // Attempt operations
+    fun getAllAttempts(): Flow<List<Attempt>> = attemptDao.getAllAttempts()
+    fun getAttemptsBySession(sessionId: String): Flow<List<Attempt>> =
+            attemptDao.getAttemptsBySession(sessionId)
+    fun getAttemptsByProblem(problemId: String): Flow<List<Attempt>> =
+            attemptDao.getAttemptsByProblem(problemId)
+    suspend fun insertAttempt(attempt: Attempt) {
+        attemptDao.insertAttempt(attempt)
+        dataStateManager.updateDataState()
+        triggerAutoSync()
+    }
+    suspend fun updateAttempt(attempt: Attempt) {
+        attemptDao.updateAttempt(attempt)
+        dataStateManager.updateDataState()
+        triggerAutoSync()
+    }
+    suspend fun deleteAttempt(attempt: Attempt) {
+        attemptDao.deleteAttempt(attempt)
+        dataStateManager.updateDataState()
+        triggerAutoSync()
+    }
+
+    suspend fun exportAllDataToZipUri(context: Context, uri: android.net.Uri) {
+        try {
+            val allGyms = gymDao.getAllGyms().first()
+            val allProblems = problemDao.getAllProblems().first()
+            val allSessions = sessionDao.getAllSessions().first()
+            val allAttempts = attemptDao.getAllAttempts().first()
+
+            validateDataIntegrity(allGyms, allProblems, allSessions, allAttempts)
+
+            val backupData =
+                    ClimbDataBackup(
+                            exportedAt = DateFormatUtils.nowISO8601(),
+                            version = "2.0",
+                            formatVersion = "2.0",
+                            gyms = allGyms.map { BackupGym.fromGym(it) },
+                            problems = allProblems.map { BackupProblem.fromProblem(it) },
+                            sessions = allSessions.map { BackupClimbSession.fromClimbSession(it) },
+                            attempts = allAttempts.map { BackupAttempt.fromAttempt(it) }
+                    )
+
+            val referencedImagePaths = allProblems.flatMap { it.imagePaths }.toSet()
+            val validImagePaths =
+                    referencedImagePaths
+                            .filter { imagePath ->
+                                try {
+                                    val imageFile =
+                                            com.atridad.openclimb.utils.ImageUtils.getImageFile(
+                                                    context,
+                                                    imagePath
+                                            )
+                                    imageFile.exists() && imageFile.length() > 0
+                                } catch (_: Exception) {
+                                    false
+                                }
+                            }
+                            .toSet()
+
+            ZipExportImportUtils.createExportZipToUri(
+                    context = context,
+                    uri = uri,
+                    exportData = backupData,
+                    referencedImagePaths = validImagePaths
+            )
+        } catch (e: Exception) {
+            throw Exception("Export failed: ${e.message}")
+        }
+    }
+
+    suspend fun importDataFromZip(file: File) {
+        try {
+            if (!file.exists() || file.length() == 0L) {
+                throw Exception("Invalid ZIP file: file is empty or doesn't exist")
+            }
+
+            val importResult = ZipExportImportUtils.extractImportZip(context, file)
+
+            if (importResult.jsonContent.isBlank()) {
+                throw Exception("Invalid ZIP file: no data.json found or empty content")
+            }
+
+            val importData =
+                    try {
+                        json.decodeFromString<ClimbDataBackup>(importResult.jsonContent)
+                    } catch (e: Exception) {
+                        throw Exception("Invalid data format: ${e.message}")
+                    }
+
+            validateImportData(importData)
+
+            attemptDao.deleteAllAttempts()
+            sessionDao.deleteAllSessions()
+            problemDao.deleteAllProblems()
+            gymDao.deleteAllGyms()
+
+            importData.gyms.forEach { backupGym ->
+                try {
+                    gymDao.insertGym(backupGym.toGym())
+                } catch (e: Exception) {
+                    throw Exception("Failed to import gym '${backupGym.name}': ${e.message}")
+                }
+            }
+
+            val updatedBackupProblems =
+                    ZipExportImportUtils.updateProblemImagePaths(
+                            importData.problems,
+                            importResult.importedImagePaths
+                    )
+
+            updatedBackupProblems.forEach { backupProblem ->
+                try {
+                    problemDao.insertProblem(backupProblem.toProblem())
+                } catch (e: Exception) {
+                    throw Exception(
+                            "Failed to import problem '${backupProblem.name}': ${e.message}"
+                    )
+                }
+            }
+
+            importData.sessions.forEach { backupSession ->
+                try {
+                    sessionDao.insertSession(backupSession.toClimbSession())
+                } catch (e: Exception) {
+                    throw Exception("Failed to import session '${backupSession.id}': ${e.message}")
+                }
+            }
+
+            importData.attempts.forEach { backupAttempt ->
+                try {
+                    attemptDao.insertAttempt(backupAttempt.toAttempt())
+                } catch (e: Exception) {
+                    throw Exception("Failed to import attempt '${backupAttempt.id}': ${e.message}")
+                }
+            }
+
+            dataStateManager.updateDataState()
+        } catch (e: Exception) {
+            throw Exception("Import failed: ${e.message}")
+        }
+    }
+
+    /**
+     * Sets the callback for auto-sync functionality. This should be called by the SyncService to
+     * register itself for auto-sync triggers.
+     */
+    fun setAutoSyncCallback(callback: (() -> Unit)?) {
+        autoSyncCallback = callback
+    }
+
+    /**
+     * Triggers auto-sync if enabled. This is called after any data modification to keep data
+     * synchronized across devices automatically.
+     */
+    private fun triggerAutoSync() {
+        autoSyncCallback?.invoke()
+    }
+
+    private fun validateDataIntegrity(
+            gyms: List<Gym>,
+            problems: List<Problem>,
+            sessions: List<ClimbSession>,
+            attempts: List<Attempt>
+    ) {
+        val gymIds = gyms.map { it.id }.toSet()
+        val invalidProblems = problems.filter { it.gymId !in gymIds }
+        if (invalidProblems.isNotEmpty()) {
+            throw Exception(
+                    "Data integrity error: ${invalidProblems.size} problems reference non-existent gyms"
+            )
+        }
+
+        val invalidSessions = sessions.filter { it.gymId !in gymIds }
+        if (invalidSessions.isNotEmpty()) {
+            throw Exception(
+                    "Data integrity error: ${invalidSessions.size} sessions reference non-existent gyms"
+            )
+        }
+
+        val problemIds = problems.map { it.id }.toSet()
+        val sessionIds = sessions.map { it.id }.toSet()
+
+        val invalidAttempts =
+                attempts.filter { it.problemId !in problemIds || it.sessionId !in sessionIds }
+        if (invalidAttempts.isNotEmpty()) {
+            throw Exception(
+                    "Data integrity error: ${invalidAttempts.size} attempts reference non-existent problems or sessions"
+            )
+        }
+    }
+
+    private fun validateImportData(importData: ClimbDataBackup) {
+        if (importData.gyms.isEmpty()) {
+            throw Exception("Import data is invalid: no gyms found")
+        }
+
+        if (importData.version.isBlank()) {
+            throw Exception("Import data is invalid: no version information")
+        }
+
+        if (importData.gyms.size > 1000 ||
+                        importData.problems.size > 10000 ||
+                        importData.sessions.size > 10000 ||
+                        importData.attempts.size > 100000
+        ) {
+            throw Exception("Import data is too large: possible corruption or malicious file")
+        }
+    }
+
+    suspend fun resetAllData() {
+        try {
+            val originalCallback = autoSyncCallback
+            autoSyncCallback = null
+
+            attemptDao.deleteAllAttempts()
+            sessionDao.deleteAllSessions()
+            problemDao.deleteAllProblems()
+            gymDao.deleteAllGyms()
+
+            clearAllImages()
+
+            autoSyncCallback = originalCallback
+        } catch (e: Exception) {
+            throw Exception("Reset failed: ${e.message}")
+        }
+    }
+
+    suspend fun insertGymWithoutSync(gym: Gym) {
+        gymDao.insertGym(gym)
+        dataStateManager.updateDataState()
+    }
+
+    suspend fun insertProblemWithoutSync(problem: Problem) {
+        problemDao.insertProblem(problem)
+        dataStateManager.updateDataState()
+    }
+
+    suspend fun insertSessionWithoutSync(session: ClimbSession) {
+        sessionDao.insertSession(session)
+        dataStateManager.updateDataState()
+    }
+
+    suspend fun insertAttemptWithoutSync(attempt: Attempt) {
+        attemptDao.insertAttempt(attempt)
+        dataStateManager.updateDataState()
+    }
+
+    private fun clearAllImages() {
+        try {
+            val imagesDir = File(context.filesDir, "images")
+            if (imagesDir.exists() && imagesDir.isDirectory) {
+                val deletedCount = imagesDir.listFiles()?.size ?: 0
+                imagesDir.deleteRecursively()
+                android.util.Log.i("ClimbRepository", "Cleared $deletedCount image files")
+            }
+        } catch (e: Exception) {
+            android.util.Log.w("ClimbRepository", "Failed to clear some images: ${e.message}")
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/data/state/DataStateManager.kt

@@ -0,0 +1,80 @@
+package com.atridad.openclimb.data.state
+
+import android.content.Context
+import android.content.SharedPreferences
+import android.util.Log
+import com.atridad.openclimb.utils.DateFormatUtils
+
+/**
+ * Manages the overall data state timestamp for sync purposes. This tracks when any data in the
+ * local database was last modified, independent of individual entity timestamps.
+ */
+class DataStateManager(context: Context) {
+
+    companion object {
+        private const val TAG = "DataStateManager"
+        private const val PREFS_NAME = "openclimb_data_state"
+        private const val KEY_LAST_MODIFIED = "last_modified_timestamp"
+        private const val KEY_INITIALIZED = "state_initialized"
+    }
+
+    private val prefs: SharedPreferences =
+            context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
+
+    init {
+        if (!isInitialized()) {
+            updateDataState()
+            markAsInitialized()
+            Log.d(TAG, "DataStateManager initialized with timestamp: ${getLastModified()}")
+        }
+    }
+
+    /**
+     * Updates the data state timestamp to the current time. Call this whenever any data is modified
+     * (create, update, delete).
+     */
+    fun updateDataState() {
+        val now = DateFormatUtils.nowISO8601()
+        prefs.edit().putString(KEY_LAST_MODIFIED, now).apply()
+        Log.d(TAG, "Data state updated to: $now")
+    }
+
+    /**
+     * Gets the current data state timestamp. This represents when any data was last modified
+     * locally.
+     */
+    fun getLastModified(): String {
+        return prefs.getString(KEY_LAST_MODIFIED, DateFormatUtils.nowISO8601())
+                ?: DateFormatUtils.nowISO8601()
+    }
+
+    /**
+     * Sets the data state timestamp to a specific value. Used when importing data from server to
+     * sync the state.
+     */
+    fun setLastModified(timestamp: String) {
+        prefs.edit().putString(KEY_LAST_MODIFIED, timestamp).apply()
+        Log.d(TAG, "Data state set to: $timestamp")
+    }
+
+    /** Resets the data state (for testing or complete data wipe). */
+    fun reset() {
+        prefs.edit().clear().apply()
+        Log.d(TAG, "Data state reset")
+    }
+
+    /** Checks if the data state has been initialized. */
+    private fun isInitialized(): Boolean {
+        return prefs.getBoolean(KEY_INITIALIZED, false)
+    }
+
+    /** Marks the data state as initialized. */
+    private fun markAsInitialized() {
+        prefs.edit().putBoolean(KEY_INITIALIZED, true).apply()
+    }
+
+    /** Gets debug information about the current state. */
+    fun getDebugInfo(): String {
+        return "DataState(lastModified=${getLastModified()}, initialized=${isInitialized()})"
+    }
+}

android/app/src/main/java/com/atridad/openclimb/data/sync/SyncService.kt

@@ -0,0 +1,801 @@
+package com.atridad.openclimb.data.sync
+
+import android.content.Context
+import android.content.SharedPreferences
+import android.util.Log
+import androidx.core.content.edit
+import com.atridad.openclimb.data.format.BackupAttempt
+import com.atridad.openclimb.data.format.BackupClimbSession
+import com.atridad.openclimb.data.format.BackupGym
+import com.atridad.openclimb.data.format.BackupProblem
+import com.atridad.openclimb.data.format.ClimbDataBackup
+import com.atridad.openclimb.data.migration.ImageMigrationService
+import com.atridad.openclimb.data.repository.ClimbRepository
+import com.atridad.openclimb.data.state.DataStateManager
+import com.atridad.openclimb.utils.DateFormatUtils
+import com.atridad.openclimb.utils.ImageNamingUtils
+import com.atridad.openclimb.utils.ImageUtils
+import java.io.IOException
+import java.time.Instant
+import java.util.concurrent.TimeUnit
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import kotlinx.coroutines.withContext
+import kotlinx.serialization.json.Json
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.RequestBody.Companion.toRequestBody
+
+class SyncService(private val context: Context, private val repository: ClimbRepository) {
+
+    private val migrationService = ImageMigrationService(context, repository)
+    private val dataStateManager = DataStateManager(context)
+    private val syncMutex = Mutex()
+
+    companion object {
+        private const val TAG = "SyncService"
+    }
+
+    private val sharedPreferences: SharedPreferences =
+            context.getSharedPreferences("sync_preferences", Context.MODE_PRIVATE)
+
+    private val httpClient =
+            OkHttpClient.Builder()
+                    .connectTimeout(30, TimeUnit.SECONDS)
+                    .readTimeout(60, TimeUnit.SECONDS)
+                    .writeTimeout(60, TimeUnit.SECONDS)
+                    .build()
+
+    private val json = Json {
+        prettyPrint = true
+        ignoreUnknownKeys = true
+        explicitNulls = false
+        encodeDefaults = true
+        coerceInputValues = true
+    }
+
+    // State
+    private val _isSyncing = MutableStateFlow(false)
+    val isSyncing: StateFlow<Boolean> = _isSyncing.asStateFlow()
+
+    private val _lastSyncTime = MutableStateFlow<String?>(null)
+    val lastSyncTime: StateFlow<String?> = _lastSyncTime.asStateFlow()
+
+    private val _syncError = MutableStateFlow<String?>(null)
+    val syncError: StateFlow<String?> = _syncError.asStateFlow()
+
+    private val _isConnected = MutableStateFlow(false)
+    val isConnected: StateFlow<Boolean> = _isConnected.asStateFlow()
+
+    private val _isTesting = MutableStateFlow(false)
+    val isTesting: StateFlow<Boolean> = _isTesting.asStateFlow()
+
+    // Configuration keys
+    private object Keys {
+        const val SERVER_URL = "sync_server_url"
+        const val AUTH_TOKEN = "sync_auth_token"
+        const val LAST_SYNC_TIME = "last_sync_time"
+        const val IS_CONNECTED = "sync_is_connected"
+        const val AUTO_SYNC_ENABLED = "auto_sync_enabled"
+    }
+
+    // Configuration properties
+    var serverURL: String
+        get() = sharedPreferences.getString(Keys.SERVER_URL, "") ?: ""
+        set(value) {
+            sharedPreferences.edit { putString(Keys.SERVER_URL, value) }
+        }
+
+    var authToken: String
+        get() = sharedPreferences.getString(Keys.AUTH_TOKEN, "") ?: ""
+        set(value) {
+            sharedPreferences.edit { putString(Keys.AUTH_TOKEN, value) }
+        }
+
+    val isConfigured: Boolean
+        get() = serverURL.isNotEmpty() && authToken.isNotEmpty()
+
+    var isAutoSyncEnabled: Boolean
+        get() = sharedPreferences.getBoolean(Keys.AUTO_SYNC_ENABLED, true)
+        set(value) {
+            sharedPreferences.edit().putBoolean(Keys.AUTO_SYNC_ENABLED, value).apply()
+        }
+
+    init {
+        _isConnected.value = sharedPreferences.getBoolean(Keys.IS_CONNECTED, false)
+        _lastSyncTime.value = sharedPreferences.getString(Keys.LAST_SYNC_TIME, null)
+
+        repository.setAutoSyncCallback {
+            kotlinx.coroutines.CoroutineScope(Dispatchers.IO).launch { triggerAutoSync() }
+        }
+    }
+
+    suspend fun downloadData(): ClimbDataBackup =
+            withContext(Dispatchers.IO) {
+                if (!isConfigured) {
+                    throw SyncException.NotConfigured
+                }
+
+                val request =
+                        Request.Builder()
+                                .url("$serverURL/sync")
+                                .get()
+                                .addHeader("Authorization", "Bearer $authToken")
+                                .addHeader("Accept", "application/json")
+                                .build()
+
+                try {
+                    val response = httpClient.newCall(request).execute()
+
+                    when (response.code) {
+                        200 -> {
+                            val responseBody =
+                                    response.body?.string()
+                                            ?: throw SyncException.InvalidResponse(
+                                                    "Empty response body"
+                                            )
+                            Log.d(TAG, "Downloaded data from server: ${responseBody.take(500)}...")
+                            try {
+                                val backup = json.decodeFromString<ClimbDataBackup>(responseBody)
+                                Log.d(
+                                        TAG,
+                                        "Server backup contains: gyms=${backup.gyms.size}, problems=${backup.problems.size}, sessions=${backup.sessions.size}, attempts=${backup.attempts.size}"
+                                )
+
+                                backup.problems.forEach { problem ->
+                                    val imageCount = problem.imagePaths?.size ?: 0
+                                    if (imageCount > 0) {
+                                        Log.d(
+                                                TAG,
+                                                "Server problem '${problem.name}' has images: ${problem.imagePaths}"
+                                        )
+                                    }
+                                }
+
+                                backup
+                            } catch (e: Exception) {
+                                Log.e(TAG, "Failed to decode download response: ${e.message}")
+                                throw SyncException.DecodingError(
+                                        e.message ?: "Failed to decode response"
+                                )
+                            }
+                        }
+                        401 -> throw SyncException.Unauthorized
+                        else -> throw SyncException.ServerError(response.code)
+                    }
+                } catch (e: IOException) {
+                    throw SyncException.NetworkError(e.message ?: "Network error")
+                }
+            }
+
+    suspend fun uploadData(backup: ClimbDataBackup): ClimbDataBackup =
+            withContext(Dispatchers.IO) {
+                if (!isConfigured) {
+                    throw SyncException.NotConfigured
+                }
+
+                val jsonBody = json.encodeToString(backup)
+                Log.d(TAG, "Uploading JSON to server: $jsonBody")
+                val requestBody = jsonBody.toRequestBody("application/json".toMediaType())
+
+                val request =
+                        Request.Builder()
+                                .url("$serverURL/sync")
+                                .put(requestBody)
+                                .addHeader("Authorization", "Bearer $authToken")
+                                .addHeader("Content-Type", "application/json")
+                                .build()
+
+                try {
+                    val response = httpClient.newCall(request).execute()
+                    Log.d(TAG, "Upload response code: ${response.code}")
+
+                    when (response.code) {
+                        200 -> {
+                            val responseBody =
+                                    response.body?.string()
+                                            ?: throw SyncException.InvalidResponse(
+                                                    "Empty response body"
+                                            )
+                            try {
+                                json.decodeFromString<ClimbDataBackup>(responseBody)
+                            } catch (e: Exception) {
+                                Log.e(TAG, "Failed to decode upload response: ${e.message}")
+                                throw SyncException.DecodingError(
+                                        e.message ?: "Failed to decode response"
+                                )
+                            }
+                        }
+                        401 -> throw SyncException.Unauthorized
+                        else -> {
+                            val errorBody = response.body?.string() ?: "No error details"
+                            Log.e(TAG, "Server error ${response.code}: $errorBody")
+                            throw SyncException.ServerError(response.code)
+                        }
+                    }
+                } catch (e: IOException) {
+                    throw SyncException.NetworkError(e.message ?: "Network error")
+                }
+            }
+
+    suspend fun uploadImage(filename: String, imageData: ByteArray) =
+            withContext(Dispatchers.IO) {
+                if (!isConfigured) {
+                    throw SyncException.NotConfigured
+                }
+
+                val justFilename = filename.substringAfterLast('/')
+                val requestBody = imageData.toRequestBody("image/*".toMediaType())
+
+                val request =
+                        Request.Builder()
+                                .url("$serverURL/images/upload?filename=$justFilename")
+                                .post(requestBody)
+                                .addHeader("Authorization", "Bearer $authToken")
+                                .build()
+
+                try {
+                    val response = httpClient.newCall(request).execute()
+
+                    when (response.code) {
+                        200 -> Unit
+                        401 -> throw SyncException.Unauthorized
+                        else -> {
+                            val errorBody = response.body?.string() ?: "No error details"
+                            Log.e(TAG, "Image upload error ${response.code}: $errorBody")
+                            throw SyncException.ServerError(response.code)
+                        }
+                    }
+                } catch (e: IOException) {
+                    throw SyncException.NetworkError(e.message ?: "Network error")
+                }
+            }
+
+    suspend fun downloadImage(filename: String): ByteArray =
+            withContext(Dispatchers.IO) {
+                if (!isConfigured) {
+                    throw SyncException.NotConfigured
+                }
+
+                Log.d(TAG, "Downloading image from server: $filename")
+                val request =
+                        Request.Builder()
+                                .url("$serverURL/images/download?filename=$filename")
+                                .get()
+                                .addHeader("Authorization", "Bearer $authToken")
+                                .build()
+
+                try {
+                    val response = httpClient.newCall(request).execute()
+                    Log.d(TAG, "Image download response for $filename: ${response.code}")
+
+                    when (response.code) {
+                        200 -> {
+                            val imageBytes =
+                                    response.body?.bytes()
+                                            ?: throw SyncException.InvalidResponse(
+                                                    "Empty image response"
+                                            )
+                            Log.d(
+                                    TAG,
+                                    "Successfully downloaded image $filename: ${imageBytes.size} bytes"
+                            )
+                            imageBytes
+                        }
+                        401 -> throw SyncException.Unauthorized
+                        404 -> {
+                            Log.w(TAG, "Image not found on server: $filename")
+                            throw SyncException.ImageNotFound(filename)
+                        }
+                        else -> {
+                            val errorBody = response.body?.string() ?: "No error details"
+                            Log.e(
+                                    TAG,
+                                    "Image download error ${response.code} for $filename: $errorBody"
+                            )
+                            throw SyncException.ServerError(response.code)
+                        }
+                    }
+                } catch (e: IOException) {
+                    Log.e(TAG, "Network error downloading image $filename: ${e.message}")
+                    throw SyncException.NetworkError(e.message ?: "Network error")
+                }
+            }
+
+    suspend fun syncWithServer() {
+        if (!isConfigured) {
+            throw SyncException.NotConfigured
+        }
+
+        if (!_isConnected.value) {
+            throw SyncException.NotConnected
+        }
+
+        syncMutex.withLock {
+            _isSyncing.value = true
+            _syncError.value = null
+
+            try {
+                Log.d(TAG, "Fixing existing image paths before sync")
+                val pathFixSuccess = fixImagePaths()
+                if (!pathFixSuccess) {
+                    Log.w(TAG, "Image path fix failed, but continuing with sync")
+                }
+
+                Log.d(TAG, "Performing image migration before sync")
+                val migrationSuccess = migrateImagesForSync()
+                if (!migrationSuccess) {
+                    Log.w(TAG, "Image migration failed, but continuing with sync")
+                }
+
+                val localBackup = createBackupFromRepository()
+
+                val serverBackup = downloadData()
+
+                val hasLocalData =
+                        localBackup.gyms.isNotEmpty() ||
+                                localBackup.problems.isNotEmpty() ||
+                                localBackup.sessions.isNotEmpty() ||
+                                localBackup.attempts.isNotEmpty()
+
+                val hasServerData =
+                        serverBackup.gyms.isNotEmpty() ||
+                                serverBackup.problems.isNotEmpty() ||
+                                serverBackup.sessions.isNotEmpty() ||
+                                serverBackup.attempts.isNotEmpty()
+
+                when {
+                    !hasLocalData && hasServerData -> {
+                        Log.d(TAG, "No local data found, performing full restore from server")
+                        val imagePathMapping = syncImagesFromServer(serverBackup)
+                        importBackupToRepository(serverBackup, imagePathMapping)
+                        Log.d(TAG, "Full restore completed")
+                    }
+                    hasLocalData && !hasServerData -> {
+                        Log.d(TAG, "No server data found, uploading local data to server")
+                        uploadData(localBackup)
+                        syncImagesForBackup(localBackup)
+                        Log.d(TAG, "Initial upload completed")
+                    }
+                    hasLocalData && hasServerData -> {
+                        val localTimestamp = parseISO8601ToMillis(localBackup.exportedAt)
+                        val serverTimestamp = parseISO8601ToMillis(serverBackup.exportedAt)
+
+                        Log.d(
+                                TAG,
+                                "Comparing timestamps: local=$localTimestamp, server=$serverTimestamp"
+                        )
+
+                        if (localTimestamp > serverTimestamp) {
+                            Log.d(TAG, "Local data is newer, replacing server content")
+                            uploadData(localBackup)
+                            syncImagesForBackup(localBackup)
+                            Log.d(TAG, "Server replaced with local data")
+                        } else if (serverTimestamp > localTimestamp) {
+                            Log.d(TAG, "Server data is newer, replacing local content")
+                            val imagePathMapping = syncImagesFromServer(serverBackup)
+                            importBackupToRepository(serverBackup, imagePathMapping)
+                            Log.d(TAG, "Local data replaced with server data")
+                        } else {
+                            Log.d(TAG, "Data is in sync (timestamps equal), no action needed")
+                        }
+                    }
+                    else -> {
+                        Log.d(TAG, "No data to sync")
+                    }
+                }
+
+                val now = DateFormatUtils.nowISO8601()
+                _lastSyncTime.value = now
+                sharedPreferences.edit().putString(Keys.LAST_SYNC_TIME, now).apply()
+            } catch (e: Exception) {
+                _syncError.value = e.message
+                throw e
+            } finally {
+                _isSyncing.value = false
+            }
+        }
+    }
+
+    private suspend fun syncImagesFromServer(backup: ClimbDataBackup): Map<String, String> {
+        val imagePathMapping = mutableMapOf<String, String>()
+
+        Log.d(TAG, "Starting to download images from server")
+        var totalImages = 0
+        var downloadedImages = 0
+        var failedImages = 0
+
+        for (problem in backup.problems) {
+            val imageCount = problem.imagePaths?.size ?: 0
+            if (imageCount > 0) {
+                Log.d(
+                        TAG,
+                        "Problem '${problem.name}' has $imageCount images: ${problem.imagePaths}"
+                )
+                totalImages += imageCount
+            }
+
+            problem.imagePaths?.forEachIndexed { index, imagePath ->
+                try {
+                    Log.d(TAG, "Attempting to download image: $imagePath")
+                    val imageData = downloadImage(imagePath)
+
+                    val serverFilename = imagePath.substringAfterLast('/')
+                    val consistentFilename =
+                            if (ImageNamingUtils.isValidImageFilename(serverFilename)) {
+                                serverFilename
+                            } else {
+                                ImageNamingUtils.generateImageFilename(problem.id, index)
+                            }
+
+                    val localImagePath =
+                            ImageUtils.saveImageFromBytesWithFilename(
+                                    context,
+                                    imageData,
+                                    consistentFilename
+                            )
+
+                    if (localImagePath != null) {
+                        imagePathMapping[serverFilename] = localImagePath
+                        downloadedImages++
+                        Log.d(
+                                TAG,
+                                "Downloaded and mapped image: $serverFilename -> $localImagePath"
+                        )
+                    } else {
+                        Log.w(TAG, "Failed to save downloaded image locally: $imagePath")
+                        failedImages++
+                    }
+                } catch (e: Exception) {
+                    Log.w(TAG, "Failed to download image $imagePath: ${e.message}")
+                    failedImages++
+                }
+            }
+        }
+
+        Log.d(
+                TAG,
+                "Image download completed: $downloadedImages downloaded, $failedImages failed, $totalImages total"
+        )
+        return imagePathMapping
+    }
+
+    private suspend fun syncImagesForBackup(backup: ClimbDataBackup) {
+        Log.d(TAG, "Starting image sync for backup with ${backup.problems.size} problems")
+
+        var totalImages = 0
+        var uploadedImages = 0
+        var failedImages = 0
+
+        for (problem in backup.problems) {
+            val imageCount = problem.imagePaths?.size ?: 0
+            totalImages += imageCount
+
+            Log.d(TAG, "Problem '${problem.name}' has $imageCount images: ${problem.imagePaths}")
+
+            problem.imagePaths?.forEachIndexed { index, imagePath ->
+                try {
+                    val imageFile = ImageUtils.getImageFile(context, imagePath)
+                    Log.d(TAG, "Checking image file: $imagePath -> ${imageFile.absolutePath}")
+                    Log.d(
+                            TAG,
+                            "Image file exists: ${imageFile.exists()}, size: ${if (imageFile.exists()) imageFile.length() else 0} bytes"
+                    )
+
+                    if (imageFile.exists() && imageFile.length() > 0) {
+                        val imageData = imageFile.readBytes()
+                        val filename = imagePath.substringAfterLast('/')
+
+                        val consistentFilename =
+                                if (ImageNamingUtils.isValidImageFilename(filename)) {
+                                    filename
+                                } else {
+                                    val newFilename =
+                                            ImageNamingUtils.generateImageFilename(
+                                                    problem.id,
+                                                    index
+                                            )
+                                    val newFile = java.io.File(imageFile.parent, newFilename)
+                                    if (imageFile.renameTo(newFile)) {
+                                        Log.d(
+                                                TAG,
+                                                "Renamed local image file: $filename -> $newFilename"
+                                        )
+                                        newFilename
+                                    } else {
+                                        Log.w(
+                                                TAG,
+                                                "Failed to rename local image file, using original"
+                                        )
+                                        filename
+                                    }
+                                }
+
+                        Log.d(TAG, "Uploading image: $consistentFilename (${imageData.size} bytes)")
+                        uploadImage(consistentFilename, imageData)
+                        uploadedImages++
+                        Log.d(TAG, "Successfully uploaded image: $consistentFilename")
+                    } else {
+                        Log.w(
+                                TAG,
+                                "Image file not found or empty: $imagePath at ${imageFile.absolutePath}"
+                        )
+                        failedImages++
+                    }
+                } catch (e: Exception) {
+                    Log.e(TAG, "Failed to upload image $imagePath: ${e.message}", e)
+                    failedImages++
+                }
+            }
+        }
+
+        Log.d(
+                TAG,
+                "Image sync completed: $uploadedImages uploaded, $failedImages failed, $totalImages total"
+        )
+    }
+
+    private suspend fun createBackupFromRepository(): ClimbDataBackup {
+        val allGyms = repository.getAllGyms().first()
+        val allProblems = repository.getAllProblems().first()
+        val allSessions = repository.getAllSessions().first()
+        val allAttempts = repository.getAllAttempts().first()
+
+        return ClimbDataBackup(
+                exportedAt = dataStateManager.getLastModified(),
+                version = "2.0",
+                formatVersion = "2.0",
+                gyms = allGyms.map { BackupGym.fromGym(it) },
+                problems = allProblems.map { BackupProblem.fromProblem(it) },
+                sessions = allSessions.map { BackupClimbSession.fromClimbSession(it) },
+                attempts = allAttempts.map { BackupAttempt.fromAttempt(it) }
+        )
+    }
+
+    private suspend fun importBackupToRepository(
+            backup: ClimbDataBackup,
+            imagePathMapping: Map<String, String> = emptyMap()
+    ) {
+        repository.resetAllData()
+
+        backup.gyms.forEach { backupGym ->
+            try {
+                val gym = backupGym.toGym()
+                Log.d(TAG, "Importing gym: ${gym.name} (ID: ${gym.id})")
+                repository.insertGymWithoutSync(gym)
+            } catch (e: Exception) {
+                Log.e(TAG, "Failed to import gym '${backupGym.name}': ${e.message}")
+                throw e
+            }
+        }
+
+        backup.problems.forEach { backupProblem ->
+            try {
+                val updatedProblem =
+                        if (imagePathMapping.isNotEmpty()) {
+                            val newImagePaths =
+                                    backupProblem.imagePaths?.map { oldPath ->
+                                        val filename = oldPath.substringAfterLast('/')
+
+                                        imagePathMapping[filename]
+                                                ?: if (ImageNamingUtils.isValidImageFilename(
+                                                                filename
+                                                        )
+                                                ) {
+                                                    "problem_images/$filename"
+                                                } else {
+                                                    val index =
+                                                            backupProblem.imagePaths.indexOf(
+                                                                    oldPath
+                                                            )
+                                                    val consistentFilename =
+                                                            ImageNamingUtils.generateImageFilename(
+                                                                    backupProblem.id,
+                                                                    index
+                                                            )
+                                                    "problem_images/$consistentFilename"
+                                                }
+                                    }
+                                            ?: emptyList()
+                            backupProblem.withUpdatedImagePaths(newImagePaths)
+                        } else {
+                            backupProblem
+                        }
+                repository.insertProblemWithoutSync(updatedProblem.toProblem())
+            } catch (e: Exception) {
+                Log.e(TAG, "Failed to import problem '${backupProblem.name}': ${e.message}")
+            }
+        }
+
+        backup.sessions.forEach { backupSession ->
+            try {
+                repository.insertSessionWithoutSync(backupSession.toClimbSession())
+            } catch (e: Exception) {
+                Log.e(TAG, "Failed to import session '${backupSession.id}': ${e.message}")
+            }
+        }
+
+        backup.attempts.forEach { backupAttempt ->
+            try {
+                repository.insertAttemptWithoutSync(backupAttempt.toAttempt())
+            } catch (e: Exception) {
+                Log.e(TAG, "Failed to import attempt '${backupAttempt.id}': ${e.message}")
+            }
+        }
+
+        dataStateManager.setLastModified(backup.exportedAt)
+        Log.d(TAG, "Data state synchronized to imported timestamp: ${backup.exportedAt}")
+    }
+
+    /** Parses ISO8601 timestamp to milliseconds for comparison */
+    private fun parseISO8601ToMillis(timestamp: String): Long {
+        return try {
+            Instant.parse(timestamp).toEpochMilli()
+        } catch (e: Exception) {
+            Log.w(TAG, "Failed to parse timestamp: $timestamp, using 0", e)
+            0L
+        }
+    }
+
+    /**
+     * Fixes existing image paths in the database to include the proper directory structure. This
+     * corrects paths like "problem_abc_0.jpg" to "problem_images/problem_abc_0.jpg"
+     */
+    suspend fun fixImagePaths(): Boolean {
+        return try {
+            Log.d(TAG, "Fixing existing image paths in database")
+
+            val allProblems = repository.getAllProblems().first()
+            var fixedCount = 0
+
+            for (problem in allProblems) {
+                if (problem.imagePaths.isNotEmpty()) {
+                    val originalPaths = problem.imagePaths
+                    val fixedPaths =
+                            problem.imagePaths.map { path ->
+                                if (!path.startsWith("problem_images/") && !path.contains("/")) {
+                                    val fixedPath = "problem_images/$path"
+                                    Log.d(TAG, "Fixed path: $path -> $fixedPath")
+                                    fixedCount++
+                                    fixedPath
+                                } else {
+                                    path
+                                }
+                            }
+
+                    if (originalPaths != fixedPaths) {
+                        val updatedProblem = problem.copy(imagePaths = fixedPaths)
+                        repository.insertProblem(updatedProblem)
+                    }
+                }
+            }
+
+            Log.i(TAG, "Fixed $fixedCount image paths in database")
+            true
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to fix image paths: ${e.message}", e)
+            false
+        }
+    }
+
+    /**
+     * Performs image migration to ensure all images use consistent naming convention before sync
+     * operations. This should be called before any sync to avoid filename conflicts.
+     */
+    suspend fun migrateImagesForSync(): Boolean {
+        return try {
+            Log.d(TAG, "Starting image migration for sync compatibility")
+            val result = migrationService.performFullMigration()
+
+            when (result) {
+                is com.atridad.openclimb.data.migration.ImageMigrationResult.AlreadyCompleted -> {
+                    Log.d(TAG, "Image migration already completed")
+                    true
+                }
+                is com.atridad.openclimb.data.migration.ImageMigrationResult.Success -> {
+                    Log.i(
+                            TAG,
+                            "Image migration completed: ${result.totalMigrated} images migrated, ${result.errors} errors"
+                    )
+                    true
+                }
+                is com.atridad.openclimb.data.migration.ImageMigrationResult.Failed -> {
+                    Log.e(TAG, "Image migration failed: ${result.error}")
+                    false
+                }
+            }
+        } catch (e: Exception) {
+            Log.e(TAG, "Image migration error: ${e.message}", e)
+            false
+        }
+    }
+
+    suspend fun testConnection() {
+        if (!isConfigured) {
+            throw SyncException.NotConfigured
+        }
+
+        _isTesting.value = true
+        _syncError.value = null
+
+        try {
+            withContext(Dispatchers.IO) {
+                val request =
+                        Request.Builder()
+                                .url("$serverURL/sync")
+                                .get()
+                                .addHeader("Authorization", "Bearer $authToken")
+                                .addHeader("Accept", "application/json")
+                                .build()
+
+                val response = httpClient.newCall(request).execute()
+
+                when (response.code) {
+                    200 -> {
+                        _isConnected.value = true
+                        sharedPreferences.edit().putBoolean(Keys.IS_CONNECTED, true).apply()
+                    }
+                    401 -> throw SyncException.Unauthorized
+                    else -> throw SyncException.ServerError(response.code)
+                }
+            }
+        } catch (e: Exception) {
+            _isConnected.value = false
+            sharedPreferences.edit().putBoolean(Keys.IS_CONNECTED, false).apply()
+            _syncError.value = e.message
+            throw e
+        } finally {
+            _isTesting.value = false
+        }
+    }
+
+    suspend fun triggerAutoSync() {
+        if (!isConfigured || !_isConnected.value || !isAutoSyncEnabled) {
+            return
+        }
+
+        if (_isSyncing.value) {
+            Log.d(TAG, "Sync already in progress, skipping auto-sync")
+            return
+        }
+
+        try {
+            syncWithServer()
+        } catch (e: Exception) {
+            Log.e(TAG, "Auto-sync failed: ${e.message}")
+            _syncError.value = e.message
+        }
+    }
+
+    fun clearConfiguration() {
+        serverURL = ""
+        authToken = ""
+        isAutoSyncEnabled = true
+        _lastSyncTime.value = null
+        _isConnected.value = false
+        _syncError.value = null
+
+        sharedPreferences.edit().clear().apply()
+    }
+}
+
+sealed class SyncException(message: String) : Exception(message) {
+    object NotConfigured :
+            SyncException("Sync is not configured. Please set server URL and auth token.")
+    object NotConnected : SyncException("Not connected to server. Please test connection first.")
+    object Unauthorized : SyncException("Unauthorized. Please check your auth token.")
+    data class ServerError(val code: Int) : SyncException("Server error: HTTP $code")
+    data class InvalidResponse(val details: String) :
+            SyncException("Invalid server response: $details")
+    data class DecodingError(val details: String) :
+            SyncException("Failed to decode server response: $details")
+    data class ImageNotFound(val filename: String) : SyncException("Image not found: $filename")
+    data class NetworkError(val details: String) : SyncException("Network error: $details")
+}

android/app/src/main/java/com/atridad/openclimb/navigation/BottomNavigationItem.kt

@@ -0,0 +1,36 @@
+package com.atridad.openclimb.navigation
+
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.*
+import androidx.compose.ui.graphics.vector.ImageVector
+
+data class BottomNavigationItem(val screen: Screen, val icon: ImageVector, val label: String)
+
+val bottomNavigationItems =
+        listOf(
+                BottomNavigationItem(
+                        screen = Screen.Sessions,
+                        icon = Icons.Default.PlayArrow,
+                        label = "Sessions"
+                ),
+                BottomNavigationItem(
+                        screen = Screen.Problems,
+                        icon = Icons.Default.Star,
+                        label = "Problems"
+                ),
+                BottomNavigationItem(
+                        screen = Screen.Analytics,
+                        icon = Icons.Default.Info,
+                        label = "Analytics"
+                ),
+                BottomNavigationItem(
+                        screen = Screen.Gyms,
+                        icon = Icons.Default.LocationOn,
+                        label = "Gyms"
+                ),
+                BottomNavigationItem(
+                        screen = Screen.Settings,
+                        icon = Icons.Default.Settings,
+                        label = "Settings"
+                )
+        )

android/app/src/main/java/com/atridad/openclimb/navigation/Screen.kt

@@ -0,0 +1,30 @@
+package com.atridad.openclimb.navigation
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+sealed class Screen {
+    @Serializable data object Sessions : Screen()
+
+    @Serializable data object Problems : Screen()
+
+    @Serializable data object Analytics : Screen()
+
+    @Serializable data object Gyms : Screen()
+
+    @Serializable data object Settings : Screen()
+
+    @Serializable data class SessionDetail(val sessionId: String) : Screen()
+
+    @Serializable data class ProblemDetail(val problemId: String) : Screen()
+
+    @Serializable data class GymDetail(val gymId: String) : Screen()
+
+    @Serializable data class AddEditGym(val gymId: String? = null) : Screen()
+
+    @Serializable
+    data class AddEditProblem(val problemId: String? = null, val gymId: String? = null) : Screen()
+
+    @Serializable
+    data class AddEditSession(val sessionId: String? = null, val gymId: String? = null) : Screen()
+}

android/app/src/main/java/com/atridad/openclimb/service/SessionTrackingService.kt

@@ -0,0 +1,292 @@
+package com.atridad.openclimb.service
+
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.app.Service
+import android.content.Context
+import android.content.Intent
+import android.os.IBinder
+import androidx.core.app.NotificationCompat
+import com.atridad.openclimb.MainActivity
+import com.atridad.openclimb.R
+import com.atridad.openclimb.data.database.OpenClimbDatabase
+import com.atridad.openclimb.data.repository.ClimbRepository
+import kotlinx.coroutines.*
+import kotlinx.coroutines.flow.firstOrNull
+import java.time.LocalDateTime
+import java.time.temporal.ChronoUnit
+import kotlinx.coroutines.runBlocking
+
+class SessionTrackingService : Service() {
+    
+    private val serviceScope = CoroutineScope(Dispatchers.IO + SupervisorJob())
+    private var notificationJob: Job? = null
+    private var monitoringJob: Job? = null
+    
+    private lateinit var repository: ClimbRepository
+    private lateinit var notificationManager: NotificationManager
+    
+    companion object {
+        const val NOTIFICATION_ID = 1001
+        const val CHANNEL_ID = "session_tracking_channel"
+        const val ACTION_START_SESSION = "start_session"
+        const val ACTION_STOP_SESSION = "stop_session"
+        const val EXTRA_SESSION_ID = "session_id"
+        
+        fun createStartIntent(context: Context, sessionId: String): Intent {
+            return Intent(context, SessionTrackingService::class.java).apply {
+                action = ACTION_START_SESSION
+                putExtra(EXTRA_SESSION_ID, sessionId)
+            }
+        }
+        
+        fun createStopIntent(context: Context, sessionId: String): Intent {
+            return Intent(context, SessionTrackingService::class.java).apply {
+                action = ACTION_STOP_SESSION
+                putExtra(EXTRA_SESSION_ID, sessionId)
+            }
+        }
+    }
+    
+    override fun onCreate() {
+        super.onCreate()
+        
+        val database = OpenClimbDatabase.getDatabase(this)
+        repository = ClimbRepository(database, this)
+        notificationManager = getSystemService(NOTIFICATION_SERVICE) as NotificationManager
+        
+        createNotificationChannel()
+    }
+    
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        when (intent?.action) {
+            ACTION_START_SESSION -> {
+                val sessionId = intent.getStringExtra(EXTRA_SESSION_ID)
+                if (sessionId != null) {
+                    startSessionTracking(sessionId)
+                }
+            }
+            ACTION_STOP_SESSION -> {
+                val sessionId = intent.getStringExtra(EXTRA_SESSION_ID)
+                serviceScope.launch {
+                    try {
+                        val targetSession = when {
+                            sessionId != null -> repository.getSessionById(sessionId)
+                            else -> repository.getActiveSession()
+                        }
+                        if (targetSession != null && targetSession.status == com.atridad.openclimb.data.model.SessionStatus.ACTIVE) {
+                            val completed = with(com.atridad.openclimb.data.model.ClimbSession) { targetSession.complete() }
+                            repository.updateSession(completed)
+                        }
+                    } finally {
+                        stopSessionTracking()
+                    }
+                }
+            }
+        }
+
+        return START_REDELIVER_INTENT
+    }
+    
+    override fun onTaskRemoved(rootIntent: Intent?) {
+        super.onTaskRemoved(rootIntent)
+    }
+    
+    override fun onBind(intent: Intent?): IBinder? = null
+    
+    private fun startSessionTracking(sessionId: String) {
+        notificationJob?.cancel()
+        monitoringJob?.cancel()
+        
+        try {
+            createAndShowNotification(sessionId)
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+        
+        notificationJob = serviceScope.launch {
+            try {
+                if (!isNotificationActive()) {
+                    delay(1000L)
+                    createAndShowNotification(sessionId)
+                }
+                
+                while (isActive) {
+                    delay(5000L)
+                    updateNotification(sessionId)
+                }
+            } catch (e: Exception) {
+                e.printStackTrace()
+            }
+        }
+        
+        monitoringJob = serviceScope.launch {
+            try {
+                while (isActive) {
+                    delay(10000L)
+                    
+                    if (!isNotificationActive()) {
+                        updateNotification(sessionId)
+                    }
+                    
+                    val session = repository.getSessionById(sessionId)
+                    if (session == null || session.status != com.atridad.openclimb.data.model.SessionStatus.ACTIVE) {
+                        stopSessionTracking()
+                        break
+                    }
+                }
+            } catch (e: Exception) {
+                e.printStackTrace()
+            }
+        }
+    }
+    
+    private fun stopSessionTracking() {
+        notificationJob?.cancel()
+        monitoringJob?.cancel()
+        stopForeground(STOP_FOREGROUND_REMOVE)
+        stopSelf()
+    }
+    
+    private fun isNotificationActive(): Boolean {
+        return try {
+            val activeNotifications = notificationManager.activeNotifications
+            activeNotifications.any { it.id == NOTIFICATION_ID }
+        } catch (e: Exception) {
+            false
+        }
+    }
+    
+    private suspend fun updateNotification(sessionId: String) {
+        try {
+            createAndShowNotification(sessionId)
+        } catch (e: Exception) {
+            e.printStackTrace()
+
+            try {
+                delay(10000L)
+                createAndShowNotification(sessionId)
+            } catch (retryException: Exception) {
+                retryException.printStackTrace()
+                stopSessionTracking()
+            }
+        }
+    }
+    
+    private fun createAndShowNotification(sessionId: String) {
+        try {
+            val session = runBlocking {
+                repository.getSessionById(sessionId)
+            }
+            if (session == null || session.status != com.atridad.openclimb.data.model.SessionStatus.ACTIVE) {
+                stopSessionTracking()
+                return
+            }
+            
+            val gym = runBlocking {
+                repository.getGymById(session.gymId)
+            }
+            
+            val attempts = runBlocking {
+                repository.getAttemptsBySession(sessionId).firstOrNull() ?: emptyList()
+            }
+            
+            val duration = session.startTime?.let { startTime ->
+                try {
+                    val start = LocalDateTime.parse(startTime)
+                    val now = LocalDateTime.now()
+                    val totalSeconds = ChronoUnit.SECONDS.between(start, now)
+                    val hours = totalSeconds / 3600
+                    val minutes = (totalSeconds % 3600) / 60
+                    val seconds = totalSeconds % 60
+                    
+                    when {
+                        hours > 0 -> "${hours}h ${minutes}m ${seconds}s"
+                        minutes > 0 -> "${minutes}m ${seconds}s"
+                        else -> "${totalSeconds}s"
+                    }
+                } catch (_: Exception) {
+                    "Active"
+                }
+            } ?: "Active"
+            
+            val notification = NotificationCompat.Builder(this, CHANNEL_ID)
+                .setContentTitle("Climbing Session Active")
+                .setContentText("${gym?.name ?: "Gym"} • $duration • ${attempts.size} attempts")
+                .setSmallIcon(R.drawable.ic_mountains)
+                .setOngoing(true)
+                .setAutoCancel(false)
+                .setPriority(NotificationCompat.PRIORITY_DEFAULT)
+                .setCategory(NotificationCompat.CATEGORY_SERVICE)
+                .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
+                .setContentIntent(createOpenAppIntent())
+                .addAction(
+                    R.drawable.ic_mountains,
+                    "Open Session",
+                    createOpenAppIntent()
+                )
+                .addAction(
+                    android.R.drawable.ic_menu_close_clear_cancel,
+                    "End Session",
+                    createStopPendingIntent(sessionId)
+                )
+                .build()
+            
+            startForeground(NOTIFICATION_ID, notification)
+            
+            notificationManager.notify(NOTIFICATION_ID, notification)
+            
+        } catch (e: Exception) {
+            e.printStackTrace()
+            throw e
+        }
+    }
+    
+    private fun createOpenAppIntent(): PendingIntent {
+        val intent = Intent(this, MainActivity::class.java).apply {
+            flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TOP
+            action = "OPEN_SESSION"
+        }
+        return PendingIntent.getActivity(
+            this,
+            0,
+            intent,
+            PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
+        )
+    }
+    
+    private fun createStopPendingIntent(sessionId: String): PendingIntent {
+        val intent = createStopIntent(this, sessionId)
+        return PendingIntent.getService(
+            this,
+            1,
+            intent,
+            PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
+        )
+    }
+    
+    private fun createNotificationChannel() {
+        val channel = NotificationChannel(
+            CHANNEL_ID,
+            "Session Tracking",
+            NotificationManager.IMPORTANCE_DEFAULT
+        ).apply {
+            description = "Shows active climbing session information"
+            setShowBadge(false)
+            lockscreenVisibility = NotificationCompat.VISIBILITY_PUBLIC
+            enableLights(false)
+            enableVibration(false)
+            setSound(null, null)
+        }
+
+        notificationManager.createNotificationChannel(channel)
+    }
+    
+    override fun onDestroy() {
+        super.onDestroy()
+        notificationJob?.cancel()
+        monitoringJob?.cancel()
+        serviceScope.cancel()
+    }
+}

android/app/src/main/java/com/atridad/openclimb/ui/OpenClimbApp.kt

@@ -0,0 +1,407 @@
+package com.atridad.openclimb.ui
+
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Add
+import androidx.compose.material.icons.filled.PlayArrow
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.NavHostController
+import androidx.navigation.compose.NavHost
+import androidx.navigation.compose.composable
+import androidx.navigation.compose.currentBackStackEntryAsState
+import androidx.navigation.compose.rememberNavController
+import androidx.navigation.toRoute
+import com.atridad.openclimb.data.database.OpenClimbDatabase
+import com.atridad.openclimb.data.repository.ClimbRepository
+import com.atridad.openclimb.data.sync.SyncService
+import com.atridad.openclimb.navigation.Screen
+import com.atridad.openclimb.navigation.bottomNavigationItems
+import com.atridad.openclimb.ui.components.NotificationPermissionDialog
+import com.atridad.openclimb.ui.screens.*
+import com.atridad.openclimb.ui.viewmodel.ClimbViewModel
+import com.atridad.openclimb.ui.viewmodel.ClimbViewModelFactory
+import com.atridad.openclimb.utils.AppShortcutManager
+import com.atridad.openclimb.utils.NotificationPermissionUtils
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun OpenClimbApp(
+        shortcutAction: String? = null,
+        lastUsedGymId: String? = null,
+        onShortcutActionProcessed: () -> Unit = {}
+) {
+    val navController = rememberNavController()
+    val context = LocalContext.current
+
+    var lastUsedGym by remember { mutableStateOf<com.atridad.openclimb.data.model.Gym?>(null) }
+
+    val database = remember { OpenClimbDatabase.getDatabase(context) }
+    val repository = remember { ClimbRepository(database, context) }
+    val syncService = remember { SyncService(context, repository) }
+    val viewModel: ClimbViewModel =
+            viewModel(factory = ClimbViewModelFactory(repository, syncService))
+
+    var showNotificationPermissionDialog by remember { mutableStateOf(false) }
+    var hasCheckedNotificationPermission by remember { mutableStateOf(false) }
+
+    val permissionLauncher =
+            rememberLauncherForActivityResult(
+                    contract = ActivityResultContracts.RequestPermission()
+            ) { isGranted: Boolean ->
+                if (!isGranted) {
+                    showNotificationPermissionDialog = false
+                }
+            }
+
+    LaunchedEffect(Unit) {
+        if (!hasCheckedNotificationPermission) {
+            hasCheckedNotificationPermission = true
+
+            if (NotificationPermissionUtils.shouldRequestNotificationPermission() &&
+                            !NotificationPermissionUtils.isNotificationPermissionGranted(context)
+            ) {
+                showNotificationPermissionDialog = true
+            }
+        }
+    }
+
+    LaunchedEffect(Unit) { viewModel.ensureSessionTrackingServiceRunning(context) }
+
+    LaunchedEffect(Unit) { syncService.triggerAutoSync() }
+
+    val activeSession by viewModel.activeSession.collectAsState()
+    val gyms by viewModel.gyms.collectAsState()
+
+    LaunchedEffect(gyms) {
+        if (gyms.isNotEmpty() && lastUsedGym == null) {
+            lastUsedGym = viewModel.getLastUsedGym()
+        }
+    }
+
+    LaunchedEffect(activeSession, gyms, lastUsedGym) {
+        AppShortcutManager.updateShortcuts(
+                context = context,
+                hasActiveSession = activeSession != null,
+                hasGyms = gyms.isNotEmpty(),
+                lastUsedGym = if (activeSession == null && gyms.size > 1) lastUsedGym else null
+        )
+    }
+
+    LaunchedEffect(shortcutAction) {
+        when (shortcutAction) {
+            AppShortcutManager.ACTION_START_SESSION -> {
+                navController.navigate(Screen.Sessions) {
+                    popUpTo(0) { inclusive = true }
+                    launchSingleTop = true
+                }
+            }
+            AppShortcutManager.ACTION_END_SESSION -> {
+                navController.navigate(Screen.Sessions) {
+                    popUpTo(0) { inclusive = true }
+                    launchSingleTop = true
+                }
+
+                activeSession?.let { session -> viewModel.endSession(context, session.id) }
+            }
+        }
+    }
+
+    LaunchedEffect(shortcutAction, activeSession, gyms, lastUsedGym) {
+        if (shortcutAction == AppShortcutManager.ACTION_START_SESSION && gyms.isNotEmpty()) {
+            android.util.Log.d(
+                    "OpenClimbApp",
+                    "Processing shortcut action: activeSession=$activeSession, gyms.size=${gyms.size}, lastUsedGymId=$lastUsedGymId, lastUsedGym=${lastUsedGym?.name}"
+            )
+
+            if (activeSession == null) {
+                if (NotificationPermissionUtils.shouldRequestNotificationPermission() &&
+                                !NotificationPermissionUtils.isNotificationPermissionGranted(
+                                        context
+                                )
+                ) {
+                    android.util.Log.d("OpenClimbApp", "Showing notification permission dialog")
+                    showNotificationPermissionDialog = true
+                } else {
+                    if (gyms.size == 1) {
+                        android.util.Log.d(
+                                "OpenClimbApp",
+                                "Starting session with single gym: ${gyms.first().name}"
+                        )
+                        viewModel.startSession(context, gyms.first().id)
+                    } else {
+                        val targetGym =
+                                lastUsedGymId?.let { gymId -> gyms.find { it.id == gymId } }
+                                        ?: lastUsedGym
+
+                        if (targetGym != null) {
+                            android.util.Log.d(
+                                    "OpenClimbApp",
+                                    "Starting session with target gym: ${targetGym.name}"
+                            )
+                            viewModel.startSession(context, targetGym.id)
+                        } else {
+                            android.util.Log.d(
+                                    "OpenClimbApp",
+                                    "No target gym found, navigating to selection"
+                            )
+                            navController.navigate(Screen.AddEditSession())
+                        }
+                    }
+                }
+            } else {
+                android.util.Log.d(
+                        "OpenClimbApp",
+                        "Active session already exists: ${activeSession?.id}"
+                )
+            }
+
+            onShortcutActionProcessed()
+        }
+    }
+
+    var fabConfig by remember { mutableStateOf<FabConfig?>(null) }
+
+    Scaffold(
+            bottomBar = { OpenClimbBottomNavigation(navController = navController) },
+            floatingActionButton = {
+                fabConfig?.let { config ->
+                    FloatingActionButton(
+                            onClick = config.onClick,
+                            containerColor = MaterialTheme.colorScheme.primary
+                    ) {
+                        Icon(
+                                imageVector = config.icon,
+                                contentDescription = config.contentDescription
+                        )
+                    }
+                }
+            }
+    ) { innerPadding ->
+        NavHost(
+                navController = navController,
+                startDestination = Screen.Sessions,
+                modifier = Modifier.padding(innerPadding)
+        ) {
+            composable<Screen.Sessions> {
+                LaunchedEffect(gyms, activeSession) {
+                    fabConfig =
+                            if (gyms.isNotEmpty() && activeSession == null) {
+                                FabConfig(
+                                        icon = Icons.Default.PlayArrow,
+                                        contentDescription = "Start Session",
+                                        onClick = {
+                                            if (NotificationPermissionUtils
+                                                            .shouldRequestNotificationPermission() &&
+                                                            !NotificationPermissionUtils
+                                                                    .isNotificationPermissionGranted(
+                                                                            context
+                                                                    )
+                                            ) {
+                                                showNotificationPermissionDialog = true
+                                            } else {
+                                                if (gyms.size == 1) {
+                                                    viewModel.startSession(context, gyms.first().id)
+                                                } else {
+                                                    navController.navigate(Screen.AddEditSession())
+                                                }
+                                            }
+                                        }
+                                )
+                            } else {
+                                null
+                            }
+                }
+                SessionsScreen(
+                        viewModel = viewModel,
+                        onNavigateToSessionDetail = { sessionId ->
+                            navController.navigate(Screen.SessionDetail(sessionId))
+                        }
+                )
+            }
+
+            composable<Screen.Problems> {
+                LaunchedEffect(gyms) {
+                    fabConfig =
+                            if (gyms.isNotEmpty()) {
+                                FabConfig(
+                                        icon = Icons.Default.Add,
+                                        contentDescription = "Add Problem",
+                                        onClick = {
+                                            navController.navigate(Screen.AddEditProblem())
+                                        }
+                                )
+                            } else {
+                                null
+                            }
+                }
+                ProblemsScreen(
+                        viewModel = viewModel,
+                        onNavigateToProblemDetail = { problemId ->
+                            navController.navigate(Screen.ProblemDetail(problemId))
+                        }
+                )
+            }
+
+            composable<Screen.Analytics> {
+                LaunchedEffect(Unit) { fabConfig = null }
+                AnalyticsScreen(viewModel = viewModel)
+            }
+
+            composable<Screen.Gyms> {
+                LaunchedEffect(Unit) {
+                    fabConfig =
+                            FabConfig(
+                                    icon = Icons.Default.Add,
+                                    contentDescription = "Add Gym",
+                                    onClick = { navController.navigate(Screen.AddEditGym()) }
+                            )
+                }
+                GymsScreen(
+                        viewModel = viewModel,
+                        onNavigateToGymDetail = { gymId ->
+                            navController.navigate(Screen.GymDetail(gymId))
+                        }
+                )
+            }
+
+            composable<Screen.Settings> {
+                LaunchedEffect(Unit) { fabConfig = null }
+                SettingsScreen(viewModel = viewModel)
+            }
+
+            composable<Screen.SessionDetail> { backStackEntry ->
+                val args = backStackEntry.toRoute<Screen.SessionDetail>()
+                LaunchedEffect(Unit) { fabConfig = null }
+                SessionDetailScreen(
+                        sessionId = args.sessionId,
+                        viewModel = viewModel,
+                        onNavigateBack = { navController.popBackStack() },
+                        onNavigateToProblemDetail = { problemId ->
+                            navController.navigate(Screen.ProblemDetail(problemId))
+                        }
+                )
+            }
+
+            composable<Screen.ProblemDetail> { backStackEntry ->
+                val args = backStackEntry.toRoute<Screen.ProblemDetail>()
+                LaunchedEffect(Unit) { fabConfig = null }
+                ProblemDetailScreen(
+                        problemId = args.problemId,
+                        viewModel = viewModel,
+                        onNavigateBack = { navController.popBackStack() },
+                        onNavigateToEdit = { problemId ->
+                            navController.navigate(Screen.AddEditProblem(problemId = problemId))
+                        }
+                )
+            }
+
+            composable<Screen.GymDetail> { backStackEntry ->
+                val args = backStackEntry.toRoute<Screen.GymDetail>()
+                LaunchedEffect(Unit) { fabConfig = null }
+                GymDetailScreen(
+                        gymId = args.gymId,
+                        viewModel = viewModel,
+                        onNavigateBack = { navController.popBackStack() },
+                        onNavigateToEdit = { gymId ->
+                            navController.navigate(Screen.AddEditGym(gymId = gymId))
+                        },
+                        onNavigateToSessionDetail = { sessionId ->
+                            navController.navigate(Screen.SessionDetail(sessionId))
+                        },
+                        onNavigateToProblemDetail = { problemId ->
+                            navController.navigate(Screen.ProblemDetail(problemId))
+                        }
+                )
+            }
+
+            composable<Screen.AddEditGym> { backStackEntry ->
+                val args = backStackEntry.toRoute<Screen.AddEditGym>()
+                LaunchedEffect(Unit) { fabConfig = null }
+                AddEditGymScreen(
+                        gymId = args.gymId,
+                        viewModel = viewModel,
+                        onNavigateBack = { navController.popBackStack() }
+                )
+            }
+
+            composable<Screen.AddEditProblem> { backStackEntry ->
+                val args = backStackEntry.toRoute<Screen.AddEditProblem>()
+                LaunchedEffect(Unit) { fabConfig = null }
+                AddEditProblemScreen(
+                        problemId = args.problemId,
+                        gymId = args.gymId,
+                        viewModel = viewModel,
+                        onNavigateBack = { navController.popBackStack() }
+                )
+            }
+
+            composable<Screen.AddEditSession> { backStackEntry ->
+                val args = backStackEntry.toRoute<Screen.AddEditSession>()
+                LaunchedEffect(Unit) { fabConfig = null }
+                AddEditSessionScreen(
+                        sessionId = args.sessionId,
+                        gymId = args.gymId,
+                        viewModel = viewModel,
+                        onNavigateBack = { navController.popBackStack() }
+                )
+            }
+        }
+
+        if (showNotificationPermissionDialog) {
+            NotificationPermissionDialog(
+                    onDismiss = { showNotificationPermissionDialog = false },
+                    onRequestPermission = {
+                        permissionLauncher.launch(
+                                NotificationPermissionUtils.getNotificationPermissionString()
+                        )
+                    }
+            )
+        }
+    }
+}
+
+@Composable
+fun OpenClimbBottomNavigation(navController: NavHostController) {
+    val navBackStackEntry by navController.currentBackStackEntryAsState()
+    val currentRoute = navBackStackEntry?.destination?.route
+
+    NavigationBar {
+        bottomNavigationItems.forEach { item ->
+            val isSelected =
+                    when (item.screen) {
+                        is Screen.Sessions -> currentRoute?.contains("Session") == true
+                        is Screen.Problems -> currentRoute?.contains("Problem") == true
+                        is Screen.Gyms -> currentRoute?.contains("Gym") == true
+                        is Screen.Analytics -> currentRoute?.contains("Analytics") == true
+                        is Screen.Settings -> currentRoute?.contains("Settings") == true
+                        else -> currentRoute?.contains(item.screen::class.simpleName ?: "") == true
+                    }
+
+            NavigationBarItem(
+                    icon = { Icon(item.icon, contentDescription = item.label) },
+                    label = { Text(item.label) },
+                    selected = isSelected,
+                    onClick = {
+                        navController.navigate(item.screen) {
+                            popUpTo(0) { inclusive = true }
+                            launchSingleTop = true
+                            // Don't restore state - always start fresh when switching tabs
+                            restoreState = false
+                        }
+                    }
+            )
+        }
+    }
+}
+
+data class FabConfig(
+        val icon: androidx.compose.ui.graphics.vector.ImageVector,
+        val contentDescription: String,
+        val onClick: () -> Unit
+)

android/app/src/main/java/com/atridad/openclimb/ui/components/ActiveSessionBanner.kt

@@ -0,0 +1,123 @@
+package com.atridad.openclimb.ui.components
+
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.*
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.PlayArrow
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import com.atridad.openclimb.data.model.ClimbSession
+import com.atridad.openclimb.data.model.Gym
+import com.atridad.openclimb.ui.theme.CustomIcons
+import kotlinx.coroutines.delay
+import java.time.LocalDateTime
+import java.time.temporal.ChronoUnit
+
+@Composable
+fun ActiveSessionBanner(
+    activeSession: ClimbSession?,
+    gym: Gym?,
+    onSessionClick: () -> Unit,
+    onEndSession: () -> Unit
+) {    
+    if (activeSession != null) {
+        // Add a timer that updates every second for real-time duration counting
+        var currentTime by remember { mutableStateOf(LocalDateTime.now()) }
+        
+        LaunchedEffect(Unit) {
+            while (true) {
+                delay(1000) // Update every second
+                currentTime = LocalDateTime.now()
+            }
+        }
+        
+        Card(
+            modifier = Modifier
+                .fillMaxWidth()
+                .clickable { onSessionClick() },
+            colors = CardDefaults.cardColors(
+                containerColor = MaterialTheme.colorScheme.primaryContainer
+            )
+        ) {
+            Row(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(16.dp),
+                horizontalArrangement = Arrangement.SpaceBetween,
+                verticalAlignment = Alignment.CenterVertically
+            ) {
+                Column(modifier = Modifier.weight(1f)) {
+                    Row(
+                        verticalAlignment = Alignment.CenterVertically
+                    ) {
+                        Icon(
+                            Icons.Default.PlayArrow,
+                            contentDescription = "Active session",
+                            tint = MaterialTheme.colorScheme.primary,
+                            modifier = Modifier.size(16.dp)
+                        )
+                        Spacer(modifier = Modifier.width(8.dp))
+                        Text(
+                            text = "Active Session",
+                            style = MaterialTheme.typography.titleSmall,
+                            fontWeight = FontWeight.Bold,
+                            color = MaterialTheme.colorScheme.onPrimaryContainer
+                        )
+                    }
+                    
+                    Spacer(modifier = Modifier.height(4.dp))
+                    
+                    Text(
+                        text = gym?.name ?: "Unknown Gym",
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onPrimaryContainer
+                    )
+                    
+                    activeSession.startTime?.let { startTime ->
+                        val duration = calculateDuration(startTime, currentTime)
+                        Text(
+                            text = duration,
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.onPrimaryContainer.copy(alpha = 0.8f)
+                        )
+                    }
+                }
+                
+                IconButton(
+                    onClick = onEndSession,
+                    colors = IconButtonDefaults.iconButtonColors(
+                        containerColor = MaterialTheme.colorScheme.error,
+                        contentColor = MaterialTheme.colorScheme.onError
+                    )
+                ) {
+                    Icon(
+                        imageVector = CustomIcons.Stop(MaterialTheme.colorScheme.onError),
+                        contentDescription = "End session"
+                    )
+                }
+            }
+        }
+    }
+}
+
+private fun calculateDuration(startTimeString: String, currentTime: LocalDateTime): String {
+    return try {
+        val startTime = LocalDateTime.parse(startTimeString)
+        val totalSeconds = ChronoUnit.SECONDS.between(startTime, currentTime)
+        val hours = totalSeconds / 3600
+        val minutes = (totalSeconds % 3600) / 60
+        val seconds = totalSeconds % 60
+        
+        when {
+            hours > 0 -> "${hours}h ${minutes}m ${seconds}s"
+            minutes > 0 -> "${minutes}m ${seconds}s"
+            else -> "${totalSeconds}s"
+        }
+    } catch (_: Exception) {
+        "Active"
+    }
+}

android/app/src/main/java/com/atridad/openclimb/ui/components/BarChart.kt

@@ -0,0 +1,208 @@
+package com.atridad.openclimb.ui.components
+
+import androidx.compose.foundation.Canvas
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.*
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.graphics.*
+import androidx.compose.ui.graphics.drawscope.DrawScope
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.text.TextMeasurer
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.drawText
+import androidx.compose.ui.text.rememberTextMeasurer
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+
+/** Data point for the bar chart */
+data class BarChartDataPoint(val label: String, val value: Int, val gradeNumeric: Int)
+
+/** Configuration for bar chart styling */
+data class BarChartStyle(
+        val barColor: Color,
+        val gridColor: Color,
+        val textColor: Color,
+        val backgroundColor: Color
+)
+
+/** Custom Bar Chart for displaying grade distribution */
+@Composable
+fun BarChart(
+        data: List<BarChartDataPoint>,
+        modifier: Modifier = Modifier,
+        style: BarChartStyle =
+                BarChartStyle(
+                        barColor = MaterialTheme.colorScheme.primary,
+                        gridColor = MaterialTheme.colorScheme.outline.copy(alpha = 0.3f),
+                        textColor = MaterialTheme.colorScheme.onSurfaceVariant,
+                        backgroundColor = MaterialTheme.colorScheme.surface
+                ),
+        showGrid: Boolean = true
+) {
+    val textMeasurer = rememberTextMeasurer()
+    val density = LocalDensity.current
+
+    Box(modifier = modifier) {
+        Canvas(modifier = Modifier.fillMaxSize().padding(16.dp)) {
+            if (data.isEmpty()) return@Canvas
+
+            val padding = with(density) { 32.dp.toPx() }
+            val chartWidth = size.width - padding * 2
+            val chartHeight = size.height - padding * 2
+
+            // Sort data by grade numeric value
+            val sortedData = data.sortedBy { it.gradeNumeric }
+
+            // Calculate max value
+            val maxValue = sortedData.maxOfOrNull { it.value } ?: 1
+
+            // Bar dimensions
+            val barCount = sortedData.size
+            val totalSpacing = chartWidth * 0.2f
+            val barSpacing = if (barCount > 1) totalSpacing / (barCount + 1) else totalSpacing / 2
+            val barWidth = (chartWidth - totalSpacing) / barCount
+
+            // Draw background
+            drawRect(
+                    color = style.backgroundColor,
+                    topLeft = Offset(padding, padding),
+                    size = androidx.compose.ui.geometry.Size(chartWidth, chartHeight)
+            )
+
+            // Draw grid
+            if (showGrid) {
+                drawGrid(
+                        padding = padding,
+                        chartWidth = chartWidth,
+                        chartHeight = chartHeight,
+                        gridColor = style.gridColor,
+                        maxValue = maxValue,
+                        textMeasurer = textMeasurer,
+                        textColor = style.textColor
+                )
+            }
+
+            // Draw bars and labels
+            sortedData.forEachIndexed { index, dataPoint ->
+                val barHeight =
+                        if (maxValue > 0) {
+                            (dataPoint.value.toFloat() / maxValue.toFloat()) * chartHeight * 0.8f
+                        } else 0f
+
+                val barX =
+                        padding +
+                                barSpacing +
+                                index * (barWidth + barSpacing / (barCount - 1).coerceAtLeast(1))
+                val barY = padding + chartHeight - barHeight
+
+                // Draw bar
+                drawRect(
+                        color = style.barColor,
+                        topLeft = Offset(barX, barY),
+                        size = androidx.compose.ui.geometry.Size(barWidth, barHeight)
+                )
+
+                // Draw value on bar
+                if (dataPoint.value > 0) {
+                    val valueText = dataPoint.value.toString()
+                    val textStyle = TextStyle(color = style.textColor, fontSize = 10.sp)
+                    val textSize = textMeasurer.measure(valueText, textStyle)
+
+                    // Position text
+                    val textY =
+                            if (barHeight > textSize.size.height + 8.dp.toPx()) {
+                                barY + 8.dp.toPx()
+                            } else {
+                                barY - 4.dp.toPx()
+                            }
+
+                    val textColor =
+                            if (barHeight > textSize.size.height + 8.dp.toPx()) {
+                                Color.White
+                            } else {
+                                style.textColor
+                            }
+
+                    drawText(
+                            textMeasurer = textMeasurer,
+                            text = valueText,
+                            style = textStyle.copy(color = textColor),
+                            topLeft = Offset(barX + barWidth / 2f - textSize.size.width / 2f, textY)
+                    )
+                }
+
+                // Draw grade label below bar
+                val gradeText = dataPoint.label
+                val labelTextStyle = TextStyle(color = style.textColor, fontSize = 10.sp)
+                val labelTextSize = textMeasurer.measure(gradeText, labelTextStyle)
+
+                drawText(
+                        textMeasurer = textMeasurer,
+                        text = gradeText,
+                        style = labelTextStyle,
+                        topLeft =
+                                Offset(
+                                        barX + barWidth / 2f - labelTextSize.size.width / 2f,
+                                        padding + chartHeight + 8.dp.toPx()
+                                )
+                )
+            }
+        }
+    }
+}
+
+private fun DrawScope.drawGrid(
+        padding: Float,
+        chartWidth: Float,
+        chartHeight: Float,
+        gridColor: Color,
+        maxValue: Int,
+        textMeasurer: TextMeasurer,
+        textColor: Color
+) {
+    val textStyle = TextStyle(color = textColor, fontSize = 10.sp)
+
+    // Horizontal grid lines
+    val gridLines =
+            when {
+                maxValue <= 5 -> (0..maxValue).toList()
+                maxValue <= 10 -> (0..maxValue step 2).toList()
+                maxValue <= 20 -> (0..maxValue step 5).toList()
+                else -> {
+                    val step = (maxValue / 5).coerceAtLeast(1)
+                    (0..maxValue step step).toList()
+                }
+            }
+
+    gridLines.forEach { value ->
+        val y = padding + chartHeight - (value.toFloat() / maxValue.toFloat()) * chartHeight * 0.8f
+
+        // Draw grid line
+        drawLine(
+                color = gridColor,
+                start = Offset(padding, y),
+                end = Offset(padding + chartWidth, y),
+                strokeWidth = 1.dp.toPx()
+        )
+
+        // Draw Y-axis label
+        if (value >= 0) {
+            val text = value.toString()
+            val textSize = textMeasurer.measure(text, textStyle)
+            drawText(
+                    textMeasurer = textMeasurer,
+                    text = text,
+                    style = textStyle,
+                    topLeft =
+                            Offset(
+                                    padding - textSize.size.width - 8.dp.toPx(),
+                                    y - textSize.size.height / 2f
+                            )
+            )
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/ui/components/FullscreenImageViewer.kt

@@ -0,0 +1,209 @@
+package com.atridad.openclimb.ui.components
+
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.gestures.detectTransformGestures
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyRow
+import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.foundation.pager.HorizontalPager
+import androidx.compose.foundation.pager.rememberPagerState
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Close
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.graphicsLayer
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.window.Dialog
+import androidx.compose.ui.window.DialogProperties
+import coil.compose.AsyncImage
+import com.atridad.openclimb.utils.ImageUtils
+import kotlinx.coroutines.launch
+
+@OptIn(ExperimentalFoundationApi::class)
+@Composable
+fun FullscreenImageViewer(
+    imagePaths: List<String>,
+    initialIndex: Int = 0,
+    onDismiss: () -> Unit
+) {
+    val context = LocalContext.current
+    val pagerState = rememberPagerState(
+        initialPage = initialIndex,
+        pageCount = { imagePaths.size }
+    )
+    val thumbnailListState = rememberLazyListState()
+    val coroutineScope = rememberCoroutineScope()
+    
+    // Auto-scroll thumbnail list to center current image
+    LaunchedEffect(pagerState.currentPage) {
+        thumbnailListState.animateScrollToItem(
+            index = pagerState.currentPage,
+            scrollOffset = -200
+        )
+    }
+    
+    Dialog(
+        onDismissRequest = onDismiss,
+        properties = DialogProperties(
+            usePlatformDefaultWidth = false,
+            decorFitsSystemWindows = false
+        )
+    ) {
+        Box(
+            modifier = Modifier
+                .fillMaxSize()
+                .background(Color.Black)
+        ) {
+            // Main image pager
+            HorizontalPager(
+                state = pagerState,
+                modifier = Modifier.fillMaxSize()
+            ) { page ->
+                ZoomableImage(
+                    imagePath = imagePaths[page],
+                    modifier = Modifier.fillMaxSize()
+                )
+            }
+            
+            // Close button
+            IconButton(
+                onClick = onDismiss,
+                modifier = Modifier
+                    .align(Alignment.TopEnd)
+                    .padding(16.dp)
+                    .background(
+                        Color.Black.copy(alpha = 0.5f),
+                        CircleShape
+                    )
+            ) {
+                Icon(
+                    Icons.Default.Close,
+                    contentDescription = "Close",
+                    tint = Color.White
+                )
+            }
+            
+            // Image counter
+            if (imagePaths.size > 1) {
+                Card(
+                    modifier = Modifier
+                        .align(Alignment.TopCenter)
+                        .padding(16.dp),
+                    colors = CardDefaults.cardColors(
+                        containerColor = Color.Black.copy(alpha = 0.7f)
+                    )
+                ) {
+                    Text(
+                        text = "${pagerState.currentPage + 1} / ${imagePaths.size}",
+                        color = Color.White,
+                        modifier = Modifier.padding(horizontal = 12.dp, vertical = 6.dp)
+                    )
+                }
+            }
+            
+            // Thumbnail strip (if multiple images)
+            if (imagePaths.size > 1) {
+                Card(
+                    modifier = Modifier
+                        .align(Alignment.BottomCenter)
+                        .fillMaxWidth()
+                        .padding(16.dp),
+                    colors = CardDefaults.cardColors(
+                        containerColor = Color.Black.copy(alpha = 0.7f)
+                    )
+                ) {
+                    LazyRow(
+                        state = thumbnailListState,
+                        modifier = Modifier.padding(8.dp),
+                        horizontalArrangement = Arrangement.spacedBy(8.dp),
+                        contentPadding = PaddingValues(horizontal = 8.dp)
+                    ) {
+                        itemsIndexed(imagePaths) { index, imagePath ->
+                            val imageFile = ImageUtils.getImageFile(context, imagePath)
+                            val isSelected = index == pagerState.currentPage
+                            
+                            AsyncImage(
+                                model = imageFile,
+                                contentDescription = "Thumbnail ${index + 1}",
+                                modifier = Modifier
+                                    .size(60.dp)
+                                    .clip(RoundedCornerShape(8.dp))
+                                    .clickable {
+                                        coroutineScope.launch {
+                                            pagerState.animateScrollToPage(index)
+                                        }
+                                    }
+                                    .then(
+                                        if (isSelected) {
+                                            Modifier.background(
+                                                Color.White.copy(alpha = 0.3f),
+                                                RoundedCornerShape(8.dp)
+                                            )
+                                        } else Modifier
+                                    ),
+                                contentScale = ContentScale.Crop
+                            )
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun ZoomableImage(
+    imagePath: String,
+    modifier: Modifier = Modifier
+) {
+    val context = LocalContext.current
+    val imageFile = ImageUtils.getImageFile(context, imagePath)
+    
+    var scale by remember { mutableFloatStateOf(1f) }
+    var offsetX by remember { mutableFloatStateOf(0f) }
+    var offsetY by remember { mutableFloatStateOf(0f) }
+    
+    Box(
+        modifier = modifier
+            .pointerInput(Unit) {
+                detectTransformGestures(
+                    onGesture = { _, pan, zoom, _ ->
+                        scale = (scale * zoom).coerceIn(0.5f, 5f)
+                        
+                        val maxOffsetX = (size.width * (scale - 1)) / 2
+                        val maxOffsetY = (size.height * (scale - 1)) / 2
+                        
+                        offsetX = (offsetX + pan.x).coerceIn(-maxOffsetX, maxOffsetX)
+                        offsetY = (offsetY + pan.y).coerceIn(-maxOffsetY, maxOffsetY)
+                    }
+                )
+            },
+        contentAlignment = Alignment.Center
+    ) {
+        AsyncImage(
+            model = imageFile,
+            contentDescription = "Full screen image",
+            modifier = Modifier
+                .fillMaxSize()
+                .graphicsLayer(
+                    scaleX = scale,
+                    scaleY = scale,
+                    translationX = offsetX,
+                    translationY = offsetY
+                ),
+            contentScale = ContentScale.Fit
+        )
+    }
+}

android/app/src/main/java/com/atridad/openclimb/ui/components/ImageDisplay.kt

@@ -0,0 +1,75 @@
+package com.atridad.openclimb.ui.components
+
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyRow
+import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.unit.dp
+import coil.compose.AsyncImage
+import com.atridad.openclimb.utils.ImageUtils
+
+@Composable
+fun ImageDisplay(
+    imagePaths: List<String>,
+    modifier: Modifier = Modifier,
+    imageSize: Int = 120,
+    onImageClick: ((Int) -> Unit)? = null
+) {
+    val context = LocalContext.current
+    
+    if (imagePaths.isNotEmpty()) {
+        LazyRow(
+            modifier = modifier,
+            horizontalArrangement = Arrangement.spacedBy(8.dp)
+        ) {
+            itemsIndexed(imagePaths) { index, imagePath ->
+                val imageFile = ImageUtils.getImageFile(context, imagePath)
+                
+                AsyncImage(
+                    model = imageFile,
+                    contentDescription = "Problem photo",
+                    modifier = Modifier
+                        .size(imageSize.dp)
+                        .clip(RoundedCornerShape(8.dp))
+                        .clickable(enabled = onImageClick != null) {
+                            onImageClick?.invoke(index)
+                        },
+                    contentScale = ContentScale.Crop
+                )
+            }
+        }
+    }
+}
+
+@Composable
+fun ImageDisplaySection(
+    imagePaths: List<String>,
+    modifier: Modifier = Modifier,
+    title: String = "Photos",
+    onImageClick: ((Int) -> Unit)? = null
+) {
+    if (imagePaths.isNotEmpty()) {
+        Column(modifier = modifier) {
+            Text(
+                text = title,
+                style = MaterialTheme.typography.titleMedium,
+                color = MaterialTheme.colorScheme.onSurface
+            )
+            
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            ImageDisplay(
+                imagePaths = imagePaths,
+                imageSize = 120,
+                onImageClick = onImageClick
+            )
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/ui/components/ImagePicker.kt

@@ -0,0 +1,182 @@
+package com.atridad.openclimb.ui.components
+
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyRow
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Add
+import androidx.compose.material.icons.filled.Close
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.unit.dp
+import coil.compose.AsyncImage
+import com.atridad.openclimb.utils.ImageUtils
+
+@Composable
+fun ImagePicker(
+    imageUris: List<String>,
+    onImagesChanged: (List<String>) -> Unit,
+    modifier: Modifier = Modifier,
+    maxImages: Int = 5
+) {
+    val context = LocalContext.current
+    var tempImageUris by remember { mutableStateOf(imageUris) }
+    
+    // Image picker launcher
+    val imagePickerLauncher = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.GetMultipleContents()
+    ) { uris ->
+        if (uris.isNotEmpty()) {
+            val currentCount = tempImageUris.size
+            val remainingSlots = maxImages - currentCount
+            val urisToProcess = uris.take(remainingSlots)
+            
+            // Process images
+            val newImagePaths = mutableListOf<String>()
+            urisToProcess.forEach { uri ->
+                val imagePath = ImageUtils.saveImageFromUri(context, uri)
+                if (imagePath != null) {
+                    newImagePaths.add(imagePath)
+                }
+            }
+            
+            if (newImagePaths.isNotEmpty()) {
+                val updatedUris = tempImageUris + newImagePaths
+                tempImageUris = updatedUris
+                onImagesChanged(updatedUris)
+            }
+        }
+    }
+    
+    Column(modifier = modifier) {
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.SpaceBetween,
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            Text(
+                text = "Photos (${tempImageUris.size}/$maxImages)",
+                style = MaterialTheme.typography.titleMedium
+            )
+            
+            if (tempImageUris.size < maxImages) {
+                TextButton(
+                    onClick = { 
+                        imagePickerLauncher.launch("image/*")
+                    }
+                ) {
+                    Icon(Icons.Default.Add, contentDescription = null, modifier = Modifier.size(16.dp))
+                    Spacer(modifier = Modifier.width(4.dp))
+                    Text("Add Photos")
+                }
+            }
+        }
+        
+        if (tempImageUris.isNotEmpty()) {
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            LazyRow(
+                horizontalArrangement = Arrangement.spacedBy(8.dp)
+            ) {
+                items(tempImageUris) { imagePath ->
+                    ImageItem(
+                        imagePath = imagePath,
+                        onRemove = {
+                            val updatedUris = tempImageUris.filter { it != imagePath }
+                            tempImageUris = updatedUris
+                            onImagesChanged(updatedUris)
+                            
+                            // Delete the image file
+                            ImageUtils.deleteImage(context, imagePath)
+                        }
+                    )
+                }
+            }
+        } else {
+            Spacer(modifier = Modifier.height(8.dp))
+            Card(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .height(100.dp),
+                colors = CardDefaults.cardColors(
+                    containerColor = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.3f)
+                )
+            ) {
+                Box(
+                    modifier = Modifier.fillMaxSize(),
+                    contentAlignment = Alignment.Center
+                ) {
+                    Column(
+                        horizontalAlignment = Alignment.CenterHorizontally
+                    ) {
+                        Icon(
+                            Icons.Default.Add,
+                            contentDescription = null,
+                            tint = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                        Spacer(modifier = Modifier.height(4.dp))
+                        Text(
+                            text = "Add photos of this problem",
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                    }
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun ImageItem(
+    imagePath: String,
+    onRemove: () -> Unit,
+    modifier: Modifier = Modifier
+) {
+    val context = LocalContext.current
+    val imageFile = ImageUtils.getImageFile(context, imagePath)
+    
+    Box(
+        modifier = modifier.size(80.dp)
+    ) {
+        AsyncImage(
+            model = imageFile,
+            contentDescription = "Problem photo",
+            modifier = Modifier
+                .fillMaxSize()
+                .clip(RoundedCornerShape(8.dp)),
+            contentScale = ContentScale.Crop
+        )
+        
+        IconButton(
+            onClick = onRemove,
+            modifier = Modifier
+                .align(Alignment.TopEnd)
+                .size(24.dp)
+        ) {
+            Card(
+                shape = RoundedCornerShape(12.dp),
+                colors = CardDefaults.cardColors(
+                    containerColor = MaterialTheme.colorScheme.errorContainer
+                )
+            ) {
+                Icon(
+                    Icons.Default.Close,
+                    contentDescription = "Remove photo",
+                    modifier = Modifier
+                        .fillMaxSize()
+                        .padding(2.dp),
+                    tint = MaterialTheme.colorScheme.onErrorContainer
+                )
+            }
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/ui/components/LineChart.kt

@@ -0,0 +1,302 @@
+package com.atridad.openclimb.ui.components
+
+import androidx.compose.foundation.Canvas
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.*
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.graphics.*
+import androidx.compose.ui.graphics.drawscope.DrawScope
+import androidx.compose.ui.graphics.drawscope.Stroke
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.text.TextMeasurer
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.drawText
+import androidx.compose.ui.text.rememberTextMeasurer
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+
+/**
+ * Data point for the line chart
+ */
+data class ChartDataPoint(
+    val x: Float,
+    val y: Float,
+    val label: String? = null
+)
+
+/**
+ * Configuration for chart styling
+ */
+data class ChartStyle(
+    val lineColor: Color,
+    val fillColor: Color,
+    val lineWidth: Float = 3f,
+    val gridColor: Color,
+    val textColor: Color,
+    val backgroundColor: Color
+)
+
+/**
+ * Custom Line Chart with area fill below the line
+ */
+@Composable
+fun LineChart(
+    data: List<ChartDataPoint>,
+    modifier: Modifier = Modifier,
+    style: ChartStyle = ChartStyle(
+        lineColor = MaterialTheme.colorScheme.primary,
+        fillColor = MaterialTheme.colorScheme.primary.copy(alpha = 0.2f),
+        gridColor = MaterialTheme.colorScheme.outline.copy(alpha = 0.3f),
+        textColor = MaterialTheme.colorScheme.onSurfaceVariant,
+        backgroundColor = MaterialTheme.colorScheme.surface
+    ),
+    showGrid: Boolean = true,
+    xAxisFormatter: (Float) -> String = { it.toString() },
+    yAxisFormatter: (Float) -> String = { it.toString() }
+) {
+    val textMeasurer = rememberTextMeasurer()
+    val density = LocalDensity.current
+    
+    Box(modifier = modifier) {
+        Canvas(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(16.dp)
+        ) {
+            if (data.isEmpty()) return@Canvas
+            
+            val padding = with(density) { 32.dp.toPx() }
+            val chartWidth = size.width - padding * 2
+            val chartHeight = size.height - padding * 2
+            
+            // Calculate data bounds
+            val dataMinY = data.minOf { it.y }
+            val dataMaxY = data.maxOf { it.y }
+            
+            // Add some padding to Y-axis (10% above and below the data range)
+            val yPadding = if (dataMaxY == dataMinY) 1f else (dataMaxY - dataMinY) * 0.1f
+            val minY = dataMinY - yPadding
+            val maxY = dataMaxY + yPadding
+            
+            val minX = data.minOf { it.x }
+            val maxX = data.maxOf { it.x }
+            
+            val xRange = if (maxX - minX == 0f) 1f else maxX - minX // Minimum range of 1 for single points
+            val yRange = maxY - minY
+            
+            // Ensure we have valid ranges
+            if (yRange == 0f) return@Canvas
+            
+            // Convert data points to screen coordinates
+            val screenPoints = data.map { point ->
+                val x = padding + (point.x - minX) / xRange * chartWidth
+                val y = padding + chartHeight - (point.y - minY) / yRange * chartHeight
+                Offset(x, y)
+            }
+            
+            // Draw background
+            drawRect(
+                color = style.backgroundColor,
+                topLeft = Offset(padding, padding),
+                size = androidx.compose.ui.geometry.Size(chartWidth, chartHeight)
+            )
+            
+            // Draw grid
+            if (showGrid) {
+                drawGrid(
+                    padding = padding,
+                    chartWidth = chartWidth,
+                    chartHeight = chartHeight,
+                    gridColor = style.gridColor,
+                    minX = minX,
+                    maxX = maxX,
+                    minY = minY,
+                    maxY = maxY,
+                    textMeasurer = textMeasurer,
+                    textColor = style.textColor,
+                    xAxisFormatter = xAxisFormatter,
+                    yAxisFormatter = yAxisFormatter,
+                    actualDataPoints = data
+                )
+            }
+            
+            // Draw area fill
+            if (screenPoints.size > 1) {
+                drawAreaFill(
+                    points = screenPoints,
+                    padding = padding,
+                    chartHeight = chartHeight,
+                    fillColor = style.fillColor
+                )
+            }
+            
+            // Draw line
+            if (screenPoints.size > 1) {
+                drawLine(
+                    points = screenPoints,
+                    lineColor = style.lineColor,
+                    lineWidth = style.lineWidth
+                )
+            }
+            
+            // Draw data points - more pronounced
+            screenPoints.forEach { point ->
+                // Draw outer circle (larger)
+                drawCircle(
+                    color = style.lineColor,
+                    radius = 8f,
+                    center = point
+                )
+                // Draw inner circle (white center)
+                drawCircle(
+                    color = style.backgroundColor,
+                    radius = 5f,
+                    center = point
+                )
+                // Draw border for better visibility
+                drawCircle(
+                    color = style.lineColor,
+                    radius = 8f,
+                    center = point,
+                    style = Stroke(width = 2f)
+                )
+            }
+        }
+    }
+}
+
+private fun DrawScope.drawGrid(
+    padding: Float,
+    chartWidth: Float,
+    chartHeight: Float,
+    gridColor: Color,
+    minX: Float,
+    maxX: Float,
+    minY: Float,
+    maxY: Float,
+    textMeasurer: TextMeasurer,
+    textColor: Color,
+    xAxisFormatter: (Float) -> String,
+    yAxisFormatter: (Float) -> String,
+    actualDataPoints: List<ChartDataPoint>
+) {
+    val textStyle = TextStyle(
+        color = textColor,
+        fontSize = 10.sp
+    )
+    
+    // Draw vertical grid lines (X-axis) - only at integer values for sessions
+    val xRange = maxX - minX
+    if (xRange > 0) {
+        val startX = kotlin.math.ceil(minX).toInt()
+        val endX = kotlin.math.floor(maxX).toInt()
+        
+        for (sessionNum in startX..endX) {
+            val x = padding + (sessionNum.toFloat() - minX) / xRange * chartWidth
+            
+            // Draw grid line
+            drawLine(
+                color = gridColor,
+                start = Offset(x, padding),
+                end = Offset(x, padding + chartHeight),
+                strokeWidth = 1.dp.toPx()
+            )
+            
+            // X-axis labels removed per user request
+        }
+    }
+    
+    // Draw horizontal grid lines (Y-axis) - only at actual data point values
+    val yRange = maxY - minY
+    if (yRange > 0) {
+        // Get unique Y values from actual data points
+        val actualYValues = actualDataPoints.map { kotlin.math.round(it.y).toInt() }.toSet()
+        
+        actualYValues.forEach { gradeValue ->
+            val y = padding + chartHeight - (gradeValue.toFloat() - minY) / yRange * chartHeight
+            
+            // Only draw if within chart bounds
+            if (y >= padding && y <= padding + chartHeight) {
+                // Draw grid line
+                drawLine(
+                    color = gridColor,
+                    start = Offset(padding, y),
+                    end = Offset(padding + chartWidth, y),
+                    strokeWidth = 1.dp.toPx()
+                )
+                
+                // Draw label
+                val text = yAxisFormatter(gradeValue.toFloat())
+                val textSize = textMeasurer.measure(text, textStyle)
+                drawText(
+                    textMeasurer = textMeasurer,
+                    text = text,
+                    style = textStyle,
+                    topLeft = Offset(
+                        padding - textSize.size.width - 8.dp.toPx(),
+                        y - textSize.size.height / 2f
+                    )
+                )
+            }
+        }
+    }
+}
+
+private fun DrawScope.drawAreaFill(
+    points: List<Offset>,
+    padding: Float,
+    chartHeight: Float,
+    fillColor: Color
+) {
+    val bottomY = padding + chartHeight // This represents the bottom of the chart area
+    
+    val path = Path().apply {
+        // Start from bottom-left (at chart bottom level)
+        moveTo(points.first().x, bottomY)
+        
+        // Draw to first point
+        lineTo(points.first().x, points.first().y)
+        
+        // Draw line through all points
+        for (i in 1 until points.size) {
+            lineTo(points[i].x, points[i].y)
+        }
+        
+        // Close the path by going to bottom-right (at chart bottom level) and back to start
+        lineTo(points.last().x, bottomY)
+        lineTo(points.first().x, bottomY)
+        close()
+    }
+    
+    drawPath(
+        path = path,
+        color = fillColor
+    )
+}
+
+private fun DrawScope.drawLine(
+    points: List<Offset>,
+    lineColor: Color,
+    lineWidth: Float
+) {
+    val path = Path().apply {
+        moveTo(points.first().x, points.first().y)
+        for (i in 1 until points.size) {
+            lineTo(points[i].x, points[i].y)
+        }
+    }
+    
+    drawPath(
+        path = path,
+        color = lineColor,
+        style = Stroke(
+            width = lineWidth,
+            cap = StrokeCap.Round,
+            join = StrokeJoin.Round
+        )
+    )
+}

android/app/src/main/java/com/atridad/openclimb/ui/components/NotificationPermissionDialog.kt

@@ -0,0 +1,89 @@
+package com.atridad.openclimb.ui.components
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Notifications
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.window.Dialog
+import androidx.compose.ui.window.DialogProperties
+
+@Composable
+fun NotificationPermissionDialog(
+    onDismiss: () -> Unit,
+    onRequestPermission: () -> Unit
+) {
+    Dialog(
+        onDismissRequest = onDismiss,
+        properties = DialogProperties(
+            dismissOnBackPress = false,
+            dismissOnClickOutside = false
+        )
+    ) {
+        Card(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(16.dp),
+            shape = MaterialTheme.shapes.medium
+        ) {
+            Column(
+                modifier = Modifier.padding(24.dp),
+                horizontalAlignment = Alignment.CenterHorizontally
+            ) {
+                Icon(
+                    imageVector = Icons.Default.Notifications,
+                    contentDescription = "Notifications",
+                    modifier = Modifier.size(48.dp),
+                    tint = MaterialTheme.colorScheme.primary
+                )
+                
+                Spacer(modifier = Modifier.height(16.dp))
+                
+                Text(
+                    text = "Enable Notifications",
+                    style = MaterialTheme.typography.headlineSmall,
+                    fontWeight = MaterialTheme.typography.headlineSmall.fontWeight,
+                    textAlign = TextAlign.Center
+                )
+                
+                Spacer(modifier = Modifier.height(12.dp))
+                
+                Text(
+                    text = "OpenClimb needs notification permission to show your active climbing session. This helps you track your progress and ensures the session doesn't get interrupted.",
+                    style = MaterialTheme.typography.bodyMedium,
+                    textAlign = TextAlign.Center,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+                
+                Spacer(modifier = Modifier.height(24.dp))
+                
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.spacedBy(12.dp)
+                ) {
+                    TextButton(
+                        onClick = onDismiss,
+                        modifier = Modifier.weight(1f)
+                    ) {
+                        Text("Not Now")
+                    }
+                    
+                    Button(
+                        onClick = {
+                            onRequestPermission()
+                            onDismiss()
+                        },
+                        modifier = Modifier.weight(1f)
+                    ) {
+                        Text("Enable")
+                    }
+                }
+            }
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/ui/components/SyncIndicator.kt

@@ -0,0 +1,49 @@
+package com.atridad.openclimb.ui.components
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.scaleIn
+import androidx.compose.animation.scaleOut
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.unit.dp
+import kotlinx.coroutines.flow.StateFlow
+
+@Composable
+fun SyncIndicator(isSyncing: StateFlow<Boolean>, modifier: Modifier = Modifier) {
+    val syncing by isSyncing.collectAsState()
+
+    AnimatedVisibility(
+            visible = syncing,
+            enter = scaleIn() + fadeIn(),
+            exit = scaleOut() + fadeOut(),
+            modifier = modifier
+    ) {
+        Box(
+                modifier =
+                        Modifier.size(28.dp)
+                                .clip(CircleShape)
+                                .background(MaterialTheme.colorScheme.primaryContainer, CircleShape)
+                                .padding(6.dp),
+                contentAlignment = Alignment.Center
+        ) {
+            CircularProgressIndicator(
+                    modifier = Modifier.size(16.dp),
+                    strokeWidth = 2.dp,
+                    color = MaterialTheme.colorScheme.primary
+            )
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/ui/screens/AddEditScreens.kt

@@ -0,0 +1,865 @@
+package com.atridad.openclimb.ui.screens
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.LazyRow
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.selection.selectable
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.semantics.Role
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.unit.dp
+import com.atridad.openclimb.data.model.*
+import com.atridad.openclimb.ui.components.ImagePicker
+import com.atridad.openclimb.ui.viewmodel.ClimbViewModel
+import java.time.LocalDateTime
+import kotlinx.coroutines.flow.first
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun AddEditGymScreen(gymId: String?, viewModel: ClimbViewModel, onNavigateBack: () -> Unit) {
+    var name by remember { mutableStateOf("") }
+    var location by remember { mutableStateOf("") }
+    var notes by remember { mutableStateOf("") }
+    var selectedClimbTypes by remember { mutableStateOf(setOf<ClimbType>()) }
+    var selectedDifficultySystems by remember { mutableStateOf(setOf<DifficultySystem>()) }
+
+    val isEditing = gymId != null
+
+    // Calculate available difficulty systems based on selected climb types
+    val availableDifficultySystems =
+            if (selectedClimbTypes.isEmpty()) {
+                emptyList()
+            } else {
+                selectedClimbTypes
+                        .flatMap { climbType -> DifficultySystem.getSystemsForClimbType(climbType) }
+                        .distinct()
+            }
+
+    // Reset selected difficulty systems when available systems change
+    LaunchedEffect(availableDifficultySystems) {
+        selectedDifficultySystems =
+                selectedDifficultySystems.filter { it in availableDifficultySystems }.toSet()
+    }
+
+    // Load existing gym data for editing
+    LaunchedEffect(gymId) {
+        if (gymId != null) {
+            val existingGym = viewModel.getGymById(gymId).first()
+            existingGym?.let { gym ->
+                name = gym.name
+                location = gym.location ?: ""
+                notes = gym.notes ?: ""
+                selectedClimbTypes = gym.supportedClimbTypes.toSet()
+                selectedDifficultySystems = gym.difficultySystems.toSet()
+            }
+        }
+    }
+
+    Scaffold(
+            topBar = {
+                TopAppBar(
+                        title = { Text(if (isEditing) "Edit Gym" else "Add Gym") },
+                        navigationIcon = {
+                            IconButton(onClick = onNavigateBack) {
+                                Icon(
+                                        Icons.AutoMirrored.Filled.ArrowBack,
+                                        contentDescription = "Back"
+                                )
+                            }
+                        },
+                        actions = {
+                            TextButton(
+                                    onClick = {
+                                        val gym =
+                                                Gym.create(
+                                                        name,
+                                                        location,
+                                                        selectedClimbTypes.toList(),
+                                                        selectedDifficultySystems.toList(),
+                                                        notes = notes
+                                                )
+
+                                        if (isEditing) {
+                                            viewModel.updateGym(gym.copy(id = gymId!!))
+                                        } else {
+                                            viewModel.addGym(gym)
+                                        }
+                                        onNavigateBack()
+                                    },
+                                    enabled =
+                                            name.isNotBlank() &&
+                                                    selectedClimbTypes.isNotEmpty() &&
+                                                    selectedDifficultySystems.isNotEmpty()
+                            ) { Text("Save") }
+                        }
+                )
+            }
+    ) { paddingValues ->
+        Column(
+                modifier = Modifier.fillMaxSize().padding(paddingValues).padding(16.dp),
+                verticalArrangement = Arrangement.spacedBy(16.dp)
+        ) {
+            // Name field
+            OutlinedTextField(
+                    value = name,
+                    onValueChange = { name = it },
+                    label = { Text("Gym Name") },
+                    modifier = Modifier.fillMaxWidth(),
+                    singleLine = true
+            )
+
+            // Location field
+            OutlinedTextField(
+                    value = location,
+                    onValueChange = { location = it },
+                    label = { Text("Location (Optional)") },
+                    modifier = Modifier.fillMaxWidth(),
+                    singleLine = true
+            )
+
+            // Climb Types
+            Card(modifier = Modifier.fillMaxWidth()) {
+                Column(modifier = Modifier.padding(16.dp)) {
+                    Text(
+                            text = "Supported Climb Types",
+                            style = MaterialTheme.typography.titleMedium,
+                            fontWeight = FontWeight.Bold
+                    )
+
+                    Spacer(modifier = Modifier.height(8.dp))
+
+                    ClimbType.entries.forEach { climbType ->
+                        Row(
+                                verticalAlignment = Alignment.CenterVertically,
+                                modifier =
+                                        Modifier.fillMaxWidth()
+                                                .selectable(
+                                                        selected = climbType in selectedClimbTypes,
+                                                        onClick = {
+                                                            selectedClimbTypes =
+                                                                    if (climbType in
+                                                                                    selectedClimbTypes
+                                                                    ) {
+                                                                        selectedClimbTypes -
+                                                                                climbType
+                                                                    } else {
+                                                                        selectedClimbTypes +
+                                                                                climbType
+                                                                    }
+                                                        },
+                                                        role = Role.Checkbox
+                                                )
+                        ) {
+                            Checkbox(
+                                    checked = climbType in selectedClimbTypes,
+                                    onCheckedChange = null
+                            )
+                            Spacer(modifier = Modifier.width(8.dp))
+                            Text(climbType.getDisplayName())
+                        }
+                    }
+                }
+            }
+
+            // Difficulty Systems
+            Card(modifier = Modifier.fillMaxWidth()) {
+                Column(modifier = Modifier.padding(16.dp)) {
+                    Text(
+                            text = "Difficulty Systems",
+                            style = MaterialTheme.typography.titleMedium,
+                            fontWeight = FontWeight.Bold
+                    )
+
+                    Spacer(modifier = Modifier.height(8.dp))
+
+                    if (selectedClimbTypes.isEmpty()) {
+                        Text(
+                                text =
+                                        "Select climb types first to see available difficulty systems",
+                                style = MaterialTheme.typography.bodyMedium,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                                modifier = Modifier.padding(vertical = 8.dp)
+                        )
+                    } else {
+                        availableDifficultySystems.forEach { system ->
+                            Row(
+                                    verticalAlignment = Alignment.CenterVertically,
+                                    modifier =
+                                            Modifier.fillMaxWidth()
+                                                    .selectable(
+                                                            selected =
+                                                                    system in
+                                                                            selectedDifficultySystems,
+                                                            onClick = {
+                                                                selectedDifficultySystems =
+                                                                        if (system in
+                                                                                        selectedDifficultySystems
+                                                                        ) {
+                                                                            selectedDifficultySystems -
+                                                                                    system
+                                                                        } else {
+                                                                            selectedDifficultySystems +
+                                                                                    system
+                                                                        }
+                                                            },
+                                                            role = Role.Checkbox
+                                                    )
+                            ) {
+                                Checkbox(
+                                        checked = system in selectedDifficultySystems,
+                                        onCheckedChange = null
+                                )
+                                Spacer(modifier = Modifier.width(8.dp))
+                                Text(system.getDisplayName())
+                            }
+                        }
+                    }
+                }
+            }
+
+            // Notes field
+            OutlinedTextField(
+                    value = notes,
+                    onValueChange = { notes = it },
+                    label = { Text("Notes (Optional)") },
+                    modifier = Modifier.fillMaxWidth(),
+                    minLines = 3
+            )
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun AddEditProblemScreen(
+        problemId: String?,
+        gymId: String?,
+        viewModel: ClimbViewModel,
+        onNavigateBack: () -> Unit
+) {
+    val isEditing = problemId != null
+    val gyms by viewModel.gyms.collectAsState()
+
+    // Problem form state
+    var selectedGym by remember {
+        mutableStateOf<Gym?>(gymId?.let { id -> gyms.find { it.id == id } })
+    }
+    var problemName by remember { mutableStateOf("") }
+    var description by remember { mutableStateOf("") }
+    var selectedClimbType by remember { mutableStateOf(ClimbType.BOULDER) }
+    var selectedDifficultySystem by remember { mutableStateOf(DifficultySystem.V_SCALE) }
+    var difficultyGrade by remember { mutableStateOf("") }
+
+    var location by remember { mutableStateOf("") }
+    var tags by remember { mutableStateOf("") }
+    var notes by remember { mutableStateOf("") }
+    var isActive by remember { mutableStateOf(true) }
+    var imagePaths by remember { mutableStateOf<List<String>>(emptyList()) }
+
+    // Load existing problem data for editing
+    LaunchedEffect(problemId) {
+        if (problemId != null) {
+            val existingProblem = viewModel.getProblemById(problemId).first()
+            existingProblem?.let { p ->
+                problemName = p.name ?: ""
+                description = p.description ?: ""
+                selectedClimbType = p.climbType
+                selectedDifficultySystem = p.difficulty.system
+                difficultyGrade = p.difficulty.grade
+
+                location = p.location ?: ""
+                tags = p.tags.joinToString(", ")
+                notes = p.notes ?: ""
+                isActive = p.isActive
+                imagePaths = p.imagePaths
+                selectedGym = gyms.find { it.id == p.gymId }
+            }
+        }
+    }
+
+    LaunchedEffect(gymId, gyms) {
+        if (gymId != null && selectedGym == null) {
+            selectedGym = gyms.find { it.id == gymId }
+        }
+    }
+
+    val availableClimbTypes = selectedGym?.supportedClimbTypes ?: ClimbType.entries.toList()
+    val availableDifficultySystems =
+            DifficultySystem.getSystemsForClimbType(selectedClimbType).filter { system ->
+                selectedGym?.difficultySystems?.contains(system) != false
+            }
+
+    // Auto-select climb type if there's only one available
+    LaunchedEffect(availableClimbTypes) {
+        if (availableClimbTypes.size == 1 && selectedClimbType != availableClimbTypes.first()) {
+            selectedClimbType = availableClimbTypes.first()
+        }
+    }
+
+    // Auto-select or reset difficulty system based on climb type
+    LaunchedEffect(selectedClimbType, availableDifficultySystems) {
+        when {
+            // If current system is not compatible, select the first available one
+            selectedDifficultySystem !in availableDifficultySystems -> {
+                selectedDifficultySystem =
+                        availableDifficultySystems.firstOrNull() ?: DifficultySystem.CUSTOM
+            }
+            // If there's only one available system and nothing is selected, auto-select it
+            availableDifficultySystems.size == 1 &&
+                    selectedDifficultySystem != availableDifficultySystems.first() -> {
+                selectedDifficultySystem = availableDifficultySystems.first()
+            }
+        }
+    }
+
+    // Reset grade when difficulty system changes (unless it's a valid grade for the new system)
+    LaunchedEffect(selectedDifficultySystem) {
+        val availableGrades = selectedDifficultySystem.getAvailableGrades()
+        if (availableGrades.isNotEmpty() && difficultyGrade !in availableGrades) {
+            difficultyGrade = ""
+        }
+    }
+
+    Scaffold(
+            topBar = {
+                TopAppBar(
+                        title = { Text(if (isEditing) "Edit Problem" else "Add Problem") },
+                        navigationIcon = {
+                            IconButton(onClick = onNavigateBack) {
+                                Icon(
+                                        Icons.AutoMirrored.Filled.ArrowBack,
+                                        contentDescription = "Back"
+                                )
+                            }
+                        },
+                        actions = {
+                            TextButton(
+                                    onClick = {
+                                        selectedGym?.let { gym ->
+                                            val difficulty =
+                                                    DifficultyGrade(
+                                                            system = selectedDifficultySystem,
+                                                            grade = difficultyGrade,
+                                                            numericValue =
+                                                                    when (selectedDifficultySystem
+                                                                    ) {
+                                                                        DifficultySystem.V_SCALE ->
+                                                                                difficultyGrade
+                                                                                        .removePrefix(
+                                                                                                "V"
+                                                                                        )
+                                                                                        .toIntOrNull()
+                                                                                        ?: 0
+                                                                        else ->
+                                                                                difficultyGrade
+                                                                                        .hashCode() %
+                                                                                        100 // Simple mapping for other systems
+                                                                    }
+                                                    )
+
+                                            val problem =
+                                                    Problem.create(
+                                                            gymId = gym.id,
+                                                            name = problemName.ifBlank { null },
+                                                            description =
+                                                                    description.ifBlank { null },
+                                                            climbType = selectedClimbType,
+                                                            difficulty = difficulty,
+                                                            tags =
+                                                                    tags.split(",")
+                                                                            .map { it.trim() }
+                                                                            .filter {
+                                                                                it.isNotBlank()
+                                                                            },
+                                                            location = location.ifBlank { null },
+                                                            imagePaths = imagePaths,
+                                                            notes = notes.ifBlank { null }
+                                                    )
+
+                                            if (isEditing) {
+                                                viewModel.updateProblem(
+                                                        problem.copy(id = problemId!!)
+                                                )
+                                            } else {
+                                                viewModel.addProblem(problem)
+                                            }
+                                            onNavigateBack()
+                                        }
+                                    },
+                                    enabled = selectedGym != null && difficultyGrade.isNotBlank()
+                            ) { Text("Save") }
+                        }
+                )
+            }
+    ) { paddingValues ->
+        LazyColumn(
+                modifier = Modifier.fillMaxSize().padding(paddingValues).padding(16.dp),
+                verticalArrangement = Arrangement.spacedBy(16.dp)
+        ) {
+            // Gym Selection
+            item {
+                Card(modifier = Modifier.fillMaxWidth()) {
+                    Column(modifier = Modifier.padding(16.dp)) {
+                        Text(
+                                text = "Select Gym",
+                                style = MaterialTheme.typography.titleMedium,
+                                fontWeight = FontWeight.Bold
+                        )
+
+                        Spacer(modifier = Modifier.height(8.dp))
+
+                        if (gyms.isEmpty()) {
+                            Text(
+                                    text = "No gyms available. Add a gym first.",
+                                    style = MaterialTheme.typography.bodyMedium,
+                                    color = MaterialTheme.colorScheme.error
+                            )
+                        } else {
+                            LazyRow(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                                items(gyms) { gym ->
+                                    FilterChip(
+                                            onClick = { selectedGym = gym },
+                                            label = { Text(gym.name) },
+                                            selected = selectedGym?.id == gym.id
+                                    )
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+            // Basic Problem Info
+            item {
+                Card(modifier = Modifier.fillMaxWidth()) {
+                    Column(modifier = Modifier.padding(16.dp)) {
+                        Text(
+                                text = "Problem Details",
+                                style = MaterialTheme.typography.titleMedium,
+                                fontWeight = FontWeight.Bold
+                        )
+
+                        Spacer(modifier = Modifier.height(16.dp))
+
+                        OutlinedTextField(
+                                value = problemName,
+                                onValueChange = { problemName = it },
+                                label = { Text("Problem Name (Optional)") },
+                                modifier = Modifier.fillMaxWidth(),
+                                singleLine = true,
+                                placeholder = { Text("e.g., 'The Overhang Monster', 'Yellow V4'") }
+                        )
+
+                        Spacer(modifier = Modifier.height(8.dp))
+
+                        OutlinedTextField(
+                                value = description,
+                                onValueChange = { description = it },
+                                label = { Text("Description (Optional)") },
+                                modifier = Modifier.fillMaxWidth(),
+                                minLines = 2,
+                                placeholder = { Text("Describe the problem, holds, style, etc.") }
+                        )
+
+                        Spacer(modifier = Modifier.height(8.dp))
+
+                        Spacer(modifier = Modifier.height(8.dp))
+
+                        OutlinedTextField(
+                                value = location,
+                                onValueChange = { location = it },
+                                label = { Text("Location (Optional)") },
+                                modifier = Modifier.fillMaxWidth(),
+                                singleLine = true,
+                                placeholder = { Text("e.g., 'Cave area', 'Wall 3', 'Right side'") }
+                        )
+                    }
+                }
+            }
+
+            // Climb Type
+            if (selectedGym != null) {
+                item {
+                    Card(modifier = Modifier.fillMaxWidth()) {
+                        Column(modifier = Modifier.padding(16.dp)) {
+                            Text(
+                                    text = "Climb Type",
+                                    style = MaterialTheme.typography.titleMedium,
+                                    fontWeight = FontWeight.Bold
+                            )
+
+                            Spacer(modifier = Modifier.height(8.dp))
+
+                            Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                                availableClimbTypes.forEach { climbType ->
+                                    FilterChip(
+                                            onClick = { selectedClimbType = climbType },
+                                            label = { Text(climbType.getDisplayName()) },
+                                            selected = selectedClimbType == climbType
+                                    )
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+            // Difficulty
+            if (selectedGym != null) {
+                item {
+                    Card(modifier = Modifier.fillMaxWidth()) {
+                        Column(modifier = Modifier.padding(16.dp)) {
+                            Text(
+                                    text = "Difficulty",
+                                    style = MaterialTheme.typography.titleMedium,
+                                    fontWeight = FontWeight.Bold
+                            )
+
+                            Spacer(modifier = Modifier.height(8.dp))
+
+                            Text(
+                                    text = "Difficulty System",
+                                    style = MaterialTheme.typography.bodyMedium,
+                                    fontWeight = FontWeight.Medium
+                            )
+
+                            LazyRow(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                                items(availableDifficultySystems) { system ->
+                                    FilterChip(
+                                            onClick = { selectedDifficultySystem = system },
+                                            label = { Text(system.getDisplayName()) },
+                                            selected = selectedDifficultySystem == system
+                                    )
+                                }
+                            }
+
+                            Spacer(modifier = Modifier.height(8.dp))
+
+                            if (selectedDifficultySystem == DifficultySystem.CUSTOM) {
+                                OutlinedTextField(
+                                        value = difficultyGrade,
+                                        onValueChange = { newValue ->
+                                            // Only allow integers for custom scales
+                                            if (newValue.isEmpty() || newValue.all { it.isDigit() }
+                                            ) {
+                                                difficultyGrade = newValue
+                                            }
+                                        },
+                                        label = { Text("Grade *") },
+                                        modifier = Modifier.fillMaxWidth(),
+                                        singleLine = true,
+                                        placeholder = {
+                                            Text("Enter numeric grade (e.g. 5, 10, 15)")
+                                        },
+                                        supportingText = {
+                                            Text("Custom grades must be whole numbers")
+                                        },
+                                        keyboardOptions =
+                                                KeyboardOptions(keyboardType = KeyboardType.Number)
+                                )
+                            } else {
+                                var expanded by remember { mutableStateOf(false) }
+                                val availableGrades = selectedDifficultySystem.getAvailableGrades()
+
+                                ExposedDropdownMenuBox(
+                                        expanded = expanded,
+                                        onExpandedChange = { expanded = !expanded },
+                                        modifier = Modifier.fillMaxWidth()
+                                ) {
+                                    OutlinedTextField(
+                                            value = difficultyGrade,
+                                            onValueChange = {},
+                                            readOnly = true,
+                                            label = { Text("Grade *") },
+                                            trailingIcon = {
+                                                ExposedDropdownMenuDefaults.TrailingIcon(
+                                                        expanded = expanded
+                                                )
+                                            },
+                                            colors =
+                                                    ExposedDropdownMenuDefaults
+                                                            .outlinedTextFieldColors(),
+                                            modifier =
+                                                    Modifier.menuAnchor(
+                                                                    androidx.compose.material3
+                                                                            .MenuAnchorType
+                                                                            .PrimaryNotEditable,
+                                                                    enabled = true
+                                                            )
+                                                            .fillMaxWidth()
+                                    )
+                                    ExposedDropdownMenu(
+                                            expanded = expanded,
+                                            onDismissRequest = { expanded = false }
+                                    ) {
+                                        availableGrades.forEach { grade ->
+                                            DropdownMenuItem(
+                                                    text = { Text(grade) },
+                                                    onClick = {
+                                                        difficultyGrade = grade
+                                                        expanded = false
+                                                    }
+                                            )
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+            // Images Section
+            item {
+                Card(modifier = Modifier.fillMaxWidth()) {
+                    Column(modifier = Modifier.padding(16.dp)) {
+                        Text(
+                                text = "Photos",
+                                style = MaterialTheme.typography.titleMedium,
+                                fontWeight = FontWeight.Bold
+                        )
+
+                        Spacer(modifier = Modifier.height(16.dp))
+
+                        ImagePicker(
+                                imageUris = imagePaths,
+                                onImagesChanged = { imagePaths = it },
+                                maxImages = 5
+                        )
+                    }
+                }
+            }
+
+            item {
+                Card(modifier = Modifier.fillMaxWidth()) {
+                    Column(modifier = Modifier.padding(16.dp)) {
+                        Text(
+                                text = "Additional Info",
+                                style = MaterialTheme.typography.titleMedium,
+                                fontWeight = FontWeight.Bold
+                        )
+
+                        Spacer(modifier = Modifier.height(16.dp))
+
+                        OutlinedTextField(
+                                value = tags,
+                                onValueChange = { tags = it },
+                                label = { Text("Tags (Optional)") },
+                                modifier = Modifier.fillMaxWidth(),
+                                singleLine = true,
+                                placeholder = { Text("e.g., crimpy, dynamic (comma-separated)") }
+                        )
+
+                        Spacer(modifier = Modifier.height(8.dp))
+
+                        OutlinedTextField(
+                                value = notes,
+                                onValueChange = { notes = it },
+                                label = { Text("Notes (Optional)") },
+                                modifier = Modifier.fillMaxWidth(),
+                                minLines = 3,
+                                placeholder = { Text("Any additional notes about this problem") }
+                        )
+
+                        Spacer(modifier = Modifier.height(16.dp))
+
+                        Row(
+                                verticalAlignment = Alignment.CenterVertically,
+                                modifier =
+                                        Modifier.fillMaxWidth()
+                                                .selectable(
+                                                        selected = isActive,
+                                                        onClick = { isActive = !isActive },
+                                                        role = Role.Checkbox
+                                                )
+                        ) {
+                            Checkbox(checked = isActive, onCheckedChange = null)
+                            Spacer(modifier = Modifier.width(8.dp))
+                            Text(
+                                    text = "Problem is currently active",
+                                    style = MaterialTheme.typography.bodyMedium
+                            )
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun AddEditSessionScreen(
+        sessionId: String?,
+        gymId: String?,
+        viewModel: ClimbViewModel,
+        onNavigateBack: () -> Unit
+) {
+    val isEditing = sessionId != null
+    val gyms by viewModel.gyms.collectAsState()
+    val context = LocalContext.current
+
+    // Session form state
+    var selectedGym by remember {
+        mutableStateOf<Gym?>(gymId?.let { id -> gyms.find { it.id == id } })
+    }
+    var sessionDate by remember { mutableStateOf(LocalDateTime.now().toLocalDate().toString()) }
+    var duration by remember { mutableStateOf("") }
+    var sessionNotes by remember { mutableStateOf("") }
+
+    // Load existing session data for editing
+    LaunchedEffect(sessionId) {
+        if (sessionId != null) {
+            val existingSession = viewModel.getSessionById(sessionId).first()
+            existingSession?.let { session ->
+                selectedGym = gyms.find { it.id == session.gymId }
+                sessionDate = session.date.split("T")[0] // Extract date part
+                duration = session.duration?.toString() ?: ""
+                sessionNotes = session.notes ?: ""
+            }
+        }
+    }
+
+    LaunchedEffect(gymId, gyms) {
+        if (gymId != null && selectedGym == null) {
+            selectedGym = gyms.find { it.id == gymId }
+        }
+    }
+
+    Scaffold(
+            topBar = {
+                TopAppBar(
+                        title = { Text(if (isEditing) "Edit Session" else "Add Session") },
+                        navigationIcon = {
+                            IconButton(onClick = onNavigateBack) {
+                                Icon(
+                                        Icons.AutoMirrored.Filled.ArrowBack,
+                                        contentDescription = "Back"
+                                )
+                            }
+                        },
+                        actions = {
+                            TextButton(
+                                    onClick = {
+                                        selectedGym?.let { gym ->
+                                            if (isEditing) {
+                                                val session =
+                                                        ClimbSession.create(
+                                                                gymId = gym.id,
+                                                                notes =
+                                                                        sessionNotes.ifBlank {
+                                                                            null
+                                                                        }
+                                                        )
+                                                viewModel.updateSession(
+                                                        session.copy(id = sessionId!!)
+                                                )
+                                            } else {
+                                                viewModel.startSession(
+                                                        context,
+                                                        gym.id,
+                                                        sessionNotes.ifBlank { null }
+                                                )
+                                            }
+                                            onNavigateBack()
+                                        }
+                                    },
+                                    enabled = selectedGym != null
+                            ) { Text("Save") }
+                        }
+                )
+            }
+    ) { paddingValues ->
+        LazyColumn(
+                modifier = Modifier.fillMaxSize().padding(paddingValues).padding(16.dp),
+                verticalArrangement = Arrangement.spacedBy(16.dp)
+        ) {
+            // Gym Selection
+            item {
+                Card(modifier = Modifier.fillMaxWidth()) {
+                    Column(modifier = Modifier.padding(16.dp)) {
+                        Text(
+                                text = "Select Gym",
+                                style = MaterialTheme.typography.titleMedium,
+                                fontWeight = FontWeight.Bold
+                        )
+
+                        Spacer(modifier = Modifier.height(8.dp))
+
+                        if (gyms.isEmpty()) {
+                            Text(
+                                    text = "No gyms available. Add a gym first.",
+                                    style = MaterialTheme.typography.bodyMedium,
+                                    color = MaterialTheme.colorScheme.error
+                            )
+                        } else {
+                            LazyRow(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                                items(gyms) { gym ->
+                                    FilterChip(
+                                            onClick = { selectedGym = gym },
+                                            label = { Text(gym.name) },
+                                            selected = selectedGym?.id == gym.id
+                                    )
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+            // Session Details
+            item {
+                Card(modifier = Modifier.fillMaxWidth()) {
+                    Column(modifier = Modifier.padding(16.dp)) {
+                        Text(
+                                text = "Session Details",
+                                style = MaterialTheme.typography.titleMedium,
+                                fontWeight = FontWeight.Bold
+                        )
+
+                        Spacer(modifier = Modifier.height(16.dp))
+
+                        OutlinedTextField(
+                                value = sessionDate,
+                                onValueChange = { sessionDate = it },
+                                label = { Text("Date (YYYY-MM-DD)") },
+                                modifier = Modifier.fillMaxWidth(),
+                                singleLine = true
+                        )
+
+                        Spacer(modifier = Modifier.height(8.dp))
+
+                        OutlinedTextField(
+                                value = duration,
+                                onValueChange = { duration = it },
+                                label = { Text("Duration (minutes)") },
+                                modifier = Modifier.fillMaxWidth(),
+                                singleLine = true,
+                                keyboardOptions =
+                                        KeyboardOptions(keyboardType = KeyboardType.Number)
+                        )
+
+                        Spacer(modifier = Modifier.height(8.dp))
+
+                        OutlinedTextField(
+                                value = sessionNotes,
+                                onValueChange = { sessionNotes = it },
+                                label = { Text("Session Notes (Optional)") },
+                                modifier = Modifier.fillMaxWidth(),
+                                minLines = 3
+                        )
+                    }
+                }
+            }
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/ui/screens/AnalyticsScreen.kt

@@ -0,0 +1,531 @@
+package com.atridad.openclimb.ui.screens
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import com.atridad.openclimb.R
+import com.atridad.openclimb.data.model.AttemptResult
+import com.atridad.openclimb.data.model.ClimbType
+import com.atridad.openclimb.data.model.DifficultySystem
+import com.atridad.openclimb.ui.components.BarChart
+import com.atridad.openclimb.ui.components.BarChartDataPoint
+import com.atridad.openclimb.ui.components.SyncIndicator
+import com.atridad.openclimb.ui.viewmodel.ClimbViewModel
+import java.time.LocalDateTime
+import java.time.format.DateTimeFormatter
+
+@Composable
+fun AnalyticsScreen(viewModel: ClimbViewModel) {
+    val sessions by viewModel.sessions.collectAsState()
+    val problems by viewModel.problems.collectAsState()
+    val attempts by viewModel.attempts.collectAsState()
+    val gyms by viewModel.gyms.collectAsState()
+
+    LazyColumn(
+            modifier = Modifier.fillMaxSize().padding(16.dp),
+            verticalArrangement = Arrangement.spacedBy(16.dp)
+    ) {
+        item {
+            Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.spacedBy(12.dp)
+            ) {
+                Icon(
+                        painter = painterResource(id = R.drawable.ic_mountains),
+                        contentDescription = "OpenClimb Logo",
+                        modifier = Modifier.size(32.dp),
+                        tint = MaterialTheme.colorScheme.primary
+                )
+                Text(
+                        text = "Analytics",
+                        style = MaterialTheme.typography.headlineMedium,
+                        fontWeight = FontWeight.Bold,
+                        modifier = Modifier.weight(1f)
+                )
+                SyncIndicator(isSyncing = viewModel.syncService.isSyncing)
+            }
+        }
+
+        // Overall Stats
+        item {
+            OverallStatsCard(
+                    totalSessions = sessions.size,
+                    totalProblems = problems.size,
+                    totalAttempts = attempts.size,
+                    totalGyms = gyms.size
+            )
+        }
+
+        // Grade Distribution Chart
+        item {
+            val gradeDistributionData = calculateGradeDistribution(sessions, problems, attempts)
+            GradeDistributionChartCard(gradeDistributionData = gradeDistributionData)
+        }
+
+        // Favorite Gym
+        item {
+            val favoriteGym =
+                    sessions.groupBy { it.gymId }.maxByOrNull { it.value.size }?.let {
+                            (gymId, sessions) ->
+                        gyms.find { it.id == gymId }?.name to sessions.size
+                    }
+
+            FavoriteGymCard(
+                    gymName = favoriteGym?.first ?: "No sessions yet",
+                    sessionCount = favoriteGym?.second ?: 0
+            )
+        }
+
+        // Recent Activity
+        item {
+            val recentSessions = sessions.take(5)
+            RecentActivityCard(recentSessions = recentSessions.size)
+        }
+    }
+}
+
+@Composable
+fun OverallStatsCard(totalSessions: Int, totalProblems: Int, totalAttempts: Int, totalGyms: Int) {
+    Card(modifier = Modifier.fillMaxWidth()) {
+        Column(modifier = Modifier.fillMaxWidth().padding(16.dp)) {
+            Text(
+                    text = "Overall Stats",
+                    style = MaterialTheme.typography.titleMedium,
+                    fontWeight = FontWeight.Bold
+            )
+
+            Spacer(modifier = Modifier.height(12.dp))
+
+            Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceEvenly
+            ) {
+                StatItem(label = "Sessions", value = totalSessions.toString())
+                StatItem(label = "Problems", value = totalProblems.toString())
+                StatItem(label = "Attempts", value = totalAttempts.toString())
+                StatItem(label = "Gyms", value = totalGyms.toString())
+            }
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun GradeDistributionChartCard(gradeDistributionData: List<GradeDistributionDataPoint>) {
+    // Find all grading systems that have been used in the data
+    val usedSystems =
+            remember(gradeDistributionData) {
+                gradeDistributionData.map { it.difficultySystem }.distinct()
+            }
+
+    var selectedSystem by
+            remember(usedSystems) {
+                mutableStateOf(usedSystems.firstOrNull() ?: DifficultySystem.V_SCALE)
+            }
+    var expanded by remember { mutableStateOf(false) }
+    var showAllTime by remember { mutableStateOf(true) }
+
+    Card(modifier = Modifier.fillMaxWidth()) {
+        Column(modifier = Modifier.fillMaxWidth().padding(16.dp)) {
+            Text(
+                    text = "Grade Distribution",
+                    style = MaterialTheme.typography.titleMedium,
+                    fontWeight = FontWeight.Bold
+            )
+
+            Spacer(modifier = Modifier.height(12.dp))
+
+            // Toggles section
+            Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+            ) {
+                // Time period toggle
+                Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                    // All Time button
+                    FilterChip(
+                            onClick = { showAllTime = true },
+                            label = {
+                                Text("All Time", style = MaterialTheme.typography.bodySmall)
+                            },
+                            selected = showAllTime,
+                            colors =
+                                    FilterChipDefaults.filterChipColors(
+                                            selectedContainerColor =
+                                                    MaterialTheme.colorScheme.primary,
+                                            selectedLabelColor = MaterialTheme.colorScheme.onPrimary
+                                    )
+                    )
+
+                    // 7 Days button
+                    FilterChip(
+                            onClick = { showAllTime = false },
+                            label = { Text("7 Days", style = MaterialTheme.typography.bodySmall) },
+                            selected = !showAllTime,
+                            colors =
+                                    FilterChipDefaults.filterChipColors(
+                                            selectedContainerColor =
+                                                    MaterialTheme.colorScheme.primary,
+                                            selectedLabelColor = MaterialTheme.colorScheme.onPrimary
+                                    )
+                    )
+                }
+
+                // Scale selector dropdown
+                if (usedSystems.size > 1) {
+                    ExposedDropdownMenuBox(
+                            expanded = expanded,
+                            onExpandedChange = { expanded = !expanded }
+                    ) {
+                        OutlinedTextField(
+                                value =
+                                        when (selectedSystem) {
+                                            DifficultySystem.V_SCALE -> "V-Scale"
+                                            DifficultySystem.FONT -> "Font"
+                                            DifficultySystem.YDS -> "YDS"
+                                            DifficultySystem.CUSTOM -> "Custom"
+                                        },
+                                onValueChange = {},
+                                readOnly = true,
+                                trailingIcon = {
+                                    ExposedDropdownMenuDefaults.TrailingIcon(expanded = expanded)
+                                },
+                                modifier =
+                                        Modifier.menuAnchor(
+                                                        type = ExposedDropdownMenuAnchorType.PrimaryNotEditable,
+                                                        enabled = true
+                                                )
+                                                .width(120.dp),
+                                textStyle = MaterialTheme.typography.bodyMedium
+                        )
+                        ExposedDropdownMenu(
+                                expanded = expanded,
+                                onDismissRequest = { expanded = false }
+                        ) {
+                            usedSystems.forEach { system ->
+                                DropdownMenuItem(
+                                        text = {
+                                            Text(
+                                                    when (system) {
+                                                        DifficultySystem.V_SCALE -> "V-Scale"
+                                                        DifficultySystem.FONT -> "Font"
+                                                        DifficultySystem.YDS -> "YDS"
+                                                        DifficultySystem.CUSTOM -> "Custom"
+                                                    }
+                                            )
+                                        },
+                                        onClick = {
+                                            selectedSystem = system
+                                            expanded = false
+                                        }
+                                )
+                            }
+                        }
+                    }
+                }
+            }
+
+            Spacer(modifier = Modifier.height(12.dp))
+
+            // Filter grade distribution data by selected scale and time period
+            val filteredGradeData =
+                    remember(gradeDistributionData, selectedSystem, showAllTime) {
+                        val systemFiltered =
+                                gradeDistributionData.filter {
+                                    it.difficultySystem == selectedSystem
+                                }
+
+                        if (showAllTime) {
+                            systemFiltered
+                        } else {
+                            // Filter for last 7 days
+                            val sevenDaysAgo = LocalDateTime.now().minusDays(7)
+                            systemFiltered.filter { dataPoint ->
+                                try {
+                                    val attemptDate =
+                                            LocalDateTime.parse(
+                                                    dataPoint.date,
+                                                    DateTimeFormatter.ISO_LOCAL_DATE_TIME
+                                            )
+                                    attemptDate.isAfter(sevenDaysAgo)
+                                } catch (_: Exception) {
+                                    // If date parsing fails, include the data point
+                                    true
+                                }
+                            }
+                        }
+                    }
+
+            if (filteredGradeData.isNotEmpty()) {
+                // Group by grade and sum counts
+                val gradeGroups =
+                        filteredGradeData
+                                .groupBy { it.grade }
+                                .mapValues { (_, dataPoints) -> dataPoints.sumOf { it.count } }
+                                .map { (grade, count) ->
+                                    val firstDataPoint =
+                                            filteredGradeData.first { it.grade == grade }
+                                    BarChartDataPoint(
+                                            label = grade,
+                                            value = count,
+                                            gradeNumeric = firstDataPoint.gradeNumeric
+                                    )
+                                }
+
+                BarChart(data = gradeGroups, modifier = Modifier.fillMaxWidth().height(220.dp))
+
+                Spacer(modifier = Modifier.height(8.dp))
+
+                Text(
+                        text =
+                                "Successful climbs by ${when(selectedSystem) {
+                        DifficultySystem.V_SCALE -> "V-grade"
+                        DifficultySystem.FONT -> "Font grade"
+                        DifficultySystem.YDS -> "YDS grade"
+                        DifficultySystem.CUSTOM -> "custom grade"
+                    }}",
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            } else {
+                Column(
+                        modifier = Modifier.fillMaxWidth().height(220.dp),
+                        horizontalAlignment = Alignment.CenterHorizontally,
+                        verticalArrangement = Arrangement.Center
+                ) {
+                    Icon(
+                            painter = painterResource(id = R.drawable.ic_mountains),
+                            contentDescription = "No data",
+                            modifier = Modifier.size(48.dp),
+                            tint = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f)
+                    )
+
+                    Spacer(modifier = Modifier.height(8.dp))
+
+                    Text(
+                            text = "No data available.",
+                            style = MaterialTheme.typography.bodyMedium,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+
+                    Text(
+                            text =
+                                    if (showAllTime)
+                                            "Complete some climbs to see your grade distribution!"
+                                    else "No climbs in the last 7 days",
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.7f)
+                    )
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun FavoriteGymCard(gymName: String, sessionCount: Int) {
+    Card(modifier = Modifier.fillMaxWidth()) {
+        Column(modifier = Modifier.fillMaxWidth().padding(16.dp)) {
+            Text(
+                    text = "Favorite Gym",
+                    style = MaterialTheme.typography.titleMedium,
+                    fontWeight = FontWeight.Bold
+            )
+
+            Spacer(modifier = Modifier.height(8.dp))
+
+            Text(
+                    text = gymName,
+                    style = MaterialTheme.typography.titleLarge,
+                    fontWeight = FontWeight.Medium
+            )
+
+            if (sessionCount > 0) {
+                Text(
+                        text = "$sessionCount sessions",
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            }
+        }
+    }
+}
+
+@Composable
+fun RecentActivityCard(recentSessions: Int) {
+    Card(modifier = Modifier.fillMaxWidth()) {
+        Column(modifier = Modifier.fillMaxWidth().padding(16.dp)) {
+            Text(
+                    text = "Recent Activity",
+                    style = MaterialTheme.typography.titleMedium,
+                    fontWeight = FontWeight.Bold
+            )
+
+            Spacer(modifier = Modifier.height(8.dp))
+
+            Text(
+                    text =
+                            if (recentSessions > 0) {
+                                "You've had $recentSessions recent sessions"
+                            } else {
+                                "No recent activity"
+                            },
+                    style = MaterialTheme.typography.bodyMedium
+            )
+        }
+    }
+}
+
+data class GradeDistributionDataPoint(
+        val date: String,
+        val grade: String,
+        val gradeNumeric: Int,
+        val count: Int,
+        val climbType: ClimbType,
+        val difficultySystem: DifficultySystem
+)
+
+fun calculateGradeDistribution(
+        sessions: List<com.atridad.openclimb.data.model.ClimbSession>,
+        problems: List<com.atridad.openclimb.data.model.Problem>,
+        attempts: List<com.atridad.openclimb.data.model.Attempt>
+): List<GradeDistributionDataPoint> {
+    if (sessions.isEmpty() || problems.isEmpty() || attempts.isEmpty()) {
+        return emptyList()
+    }
+
+    // Get all successful attempts
+    val successfulAttempts =
+            attempts.filter {
+                it.result == AttemptResult.SUCCESS || it.result == AttemptResult.FLASH
+            }
+
+    if (successfulAttempts.isEmpty()) {
+        return emptyList()
+    }
+
+    // Map attempts to problems and create grade distribution data
+    val gradeDistribution = mutableMapOf<String, GradeDistributionDataPoint>()
+
+    successfulAttempts.forEach { attempt ->
+        val problem = problems.find { it.id == attempt.problemId }
+        val session = sessions.find { it.id == attempt.sessionId }
+
+        if (problem != null && session != null) {
+            val key = "${problem.difficulty.system.name}-${problem.difficulty.grade}"
+
+            val existing = gradeDistribution[key]
+            if (existing != null) {
+                gradeDistribution[key] = existing.copy(count = existing.count + 1)
+            } else {
+                gradeDistribution[key] =
+                        GradeDistributionDataPoint(
+                                date = attempt.timestamp,
+                                grade = problem.difficulty.grade,
+                                gradeNumeric =
+                                        gradeToNumeric(
+                                                problem.difficulty.system,
+                                                problem.difficulty.grade
+                                        ),
+                                count = 1,
+                                climbType = problem.climbType,
+                                difficultySystem = problem.difficulty.system
+                        )
+            }
+        }
+    }
+
+    return gradeDistribution.values.toList()
+}
+
+fun gradeToNumeric(system: DifficultySystem, grade: String): Int {
+    return when (system) {
+        DifficultySystem.V_SCALE -> {
+            when (grade) {
+                "VB" -> 0
+                else -> grade.removePrefix("V").toIntOrNull() ?: 0
+            }
+        }
+        DifficultySystem.FONT -> {
+            when (grade) {
+                "3" -> 3
+                "4A" -> 4
+                "4B" -> 5
+                "4C" -> 6
+                "5A" -> 7
+                "5B" -> 8
+                "5C" -> 9
+                "6A" -> 10
+                "6A+" -> 11
+                "6B" -> 12
+                "6B+" -> 13
+                "6C" -> 14
+                "6C+" -> 15
+                "7A" -> 16
+                "7A+" -> 17
+                "7B" -> 18
+                "7B+" -> 19
+                "7C" -> 20
+                "7C+" -> 21
+                "8A" -> 22
+                "8A+" -> 23
+                "8B" -> 24
+                "8B+" -> 25
+                "8C" -> 26
+                "8C+" -> 27
+                else -> 0
+            }
+        }
+        DifficultySystem.YDS -> {
+            when (grade) {
+                "5.0" -> 50
+                "5.1" -> 51
+                "5.2" -> 52
+                "5.3" -> 53
+                "5.4" -> 54
+                "5.5" -> 55
+                "5.6" -> 56
+                "5.7" -> 57
+                "5.8" -> 58
+                "5.9" -> 59
+                "5.10a" -> 60
+                "5.10b" -> 61
+                "5.10c" -> 62
+                "5.10d" -> 63
+                "5.11a" -> 64
+                "5.11b" -> 65
+                "5.11c" -> 66
+                "5.11d" -> 67
+                "5.12a" -> 68
+                "5.12b" -> 69
+                "5.12c" -> 70
+                "5.12d" -> 71
+                "5.13a" -> 72
+                "5.13b" -> 73
+                "5.13c" -> 74
+                "5.13d" -> 75
+                "5.14a" -> 76
+                "5.14b" -> 77
+                "5.14c" -> 78
+                "5.14d" -> 79
+                "5.15a" -> 80
+                "5.15b" -> 81
+                "5.15c" -> 82
+                "5.15d" -> 83
+                else -> 0
+            }
+        }
+        DifficultySystem.CUSTOM -> {
+            // Custom grades are numeric strings, so parse them directly
+            grade.toIntOrNull() ?: 0
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/ui/screens/GymsScreen.kt

@@ -0,0 +1,119 @@
+package com.atridad.openclimb.ui.screens
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import com.atridad.openclimb.R
+import com.atridad.openclimb.data.model.Gym
+import com.atridad.openclimb.ui.components.SyncIndicator
+import com.atridad.openclimb.ui.viewmodel.ClimbViewModel
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun GymsScreen(viewModel: ClimbViewModel, onNavigateToGymDetail: (String) -> Unit) {
+    val gyms by viewModel.gyms.collectAsState()
+
+    Column(modifier = Modifier.fillMaxSize().padding(16.dp)) {
+        Row(
+                modifier = Modifier.fillMaxWidth(),
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.spacedBy(12.dp)
+        ) {
+            Icon(
+                    painter = painterResource(id = R.drawable.ic_mountains),
+                    contentDescription = "OpenClimb Logo",
+                    modifier = Modifier.size(32.dp),
+                    tint = MaterialTheme.colorScheme.primary
+            )
+            Text(
+                    text = "Climbing Gyms",
+                    style = MaterialTheme.typography.headlineMedium,
+                    fontWeight = FontWeight.Bold,
+                    modifier = Modifier.weight(1f)
+            )
+            SyncIndicator(isSyncing = viewModel.syncService.isSyncing)
+        }
+
+        Spacer(modifier = Modifier.height(16.dp))
+
+        if (gyms.isEmpty()) {
+            EmptyStateMessage(
+                    title = "No Gyms Added",
+                    message = "Add your favorite climbing gyms to start tracking your progress!",
+                    onActionClick = {},
+                    actionText = ""
+            )
+        } else {
+            LazyColumn {
+                items(gyms) { gym ->
+                    GymCard(gym = gym, onClick = { onNavigateToGymDetail(gym.id) })
+                    Spacer(modifier = Modifier.height(8.dp))
+                }
+            }
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun GymCard(gym: Gym, onClick: () -> Unit) {
+    Card(onClick = onClick, modifier = Modifier.fillMaxWidth()) {
+        Column(modifier = Modifier.fillMaxWidth().padding(16.dp)) {
+            Text(
+                    text = gym.name,
+                    style = MaterialTheme.typography.titleLarge,
+                    fontWeight = FontWeight.Bold
+            )
+
+            gym.location?.let { location ->
+                Spacer(modifier = Modifier.height(4.dp))
+                Text(
+                        text = location,
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            }
+
+            Spacer(modifier = Modifier.height(8.dp))
+
+            Row {
+                gym.supportedClimbTypes.forEach { climbType ->
+                    AssistChip(
+                            onClick = {},
+                            label = { Text(climbType.getDisplayName()) },
+                            modifier = Modifier.padding(end = 4.dp)
+                    )
+                }
+            }
+
+            if (gym.difficultySystems.isNotEmpty()) {
+                Spacer(modifier = Modifier.height(4.dp))
+                Text(
+                        text =
+                                "Systems: ${gym.difficultySystems.joinToString(", ") { it.getDisplayName() }}",
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            }
+
+            gym.notes?.let { notes ->
+                if (notes.isNotBlank()) {
+                    Spacer(modifier = Modifier.height(8.dp))
+                    Text(
+                            text = notes,
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                            maxLines = 2
+                    )
+                }
+            }
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/ui/screens/ProblemsScreen.kt

@@ -0,0 +1,322 @@
+package com.atridad.openclimb.ui.screens
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.LazyRow
+import androidx.compose.foundation.lazy.items
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import com.atridad.openclimb.R
+import com.atridad.openclimb.data.model.ClimbType
+import com.atridad.openclimb.data.model.Gym
+import com.atridad.openclimb.data.model.Problem
+import com.atridad.openclimb.ui.components.FullscreenImageViewer
+import com.atridad.openclimb.ui.components.ImageDisplay
+import com.atridad.openclimb.ui.components.SyncIndicator
+import com.atridad.openclimb.ui.viewmodel.ClimbViewModel
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun ProblemsScreen(viewModel: ClimbViewModel, onNavigateToProblemDetail: (String) -> Unit) {
+    val problems by viewModel.problems.collectAsState()
+    val gyms by viewModel.gyms.collectAsState()
+    var showImageViewer by remember { mutableStateOf(false) }
+    var selectedImagePaths by remember { mutableStateOf<List<String>>(emptyList()) }
+    var selectedImageIndex by remember { mutableIntStateOf(0) }
+
+    // Filter state
+    var selectedClimbType by remember { mutableStateOf<ClimbType?>(null) }
+    var selectedGym by remember { mutableStateOf<Gym?>(null) }
+
+    // Apply filters
+    val filteredProblems =
+            problems.filter { problem ->
+                val climbTypeMatch = selectedClimbType?.let { it == problem.climbType } != false
+                val gymMatch = selectedGym?.let { it.id == problem.gymId } != false
+                climbTypeMatch && gymMatch
+            }
+
+    // Separate active and inactive problems
+    val activeProblems = filteredProblems.filter { it.isActive }
+    val inactiveProblems = filteredProblems.filter { !it.isActive }
+    val sortedProblems = activeProblems + inactiveProblems
+
+    Column(modifier = Modifier.fillMaxSize().padding(16.dp)) {
+        Row(
+                modifier = Modifier.fillMaxWidth(),
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.spacedBy(12.dp)
+        ) {
+            Icon(
+                    painter = painterResource(id = R.drawable.ic_mountains),
+                    contentDescription = "OpenClimb Logo",
+                    modifier = Modifier.size(32.dp),
+                    tint = MaterialTheme.colorScheme.primary
+            )
+            Text(
+                    text = "Climbing Problems",
+                    style = MaterialTheme.typography.headlineMedium,
+                    fontWeight = FontWeight.Bold,
+                    modifier = Modifier.weight(1f)
+            )
+            SyncIndicator(isSyncing = viewModel.syncService.isSyncing)
+        }
+
+        Spacer(modifier = Modifier.height(16.dp))
+
+        // Filters Section
+        if (problems.isNotEmpty()) {
+            Card(modifier = Modifier.fillMaxWidth()) {
+                Column(modifier = Modifier.padding(16.dp)) {
+                    Text(
+                            text = "Filters",
+                            style = MaterialTheme.typography.titleMedium,
+                            fontWeight = FontWeight.Bold
+                    )
+
+                    Spacer(modifier = Modifier.height(12.dp))
+
+                    // Climb Type Filter
+                    Text(
+                            text = "Climb Type",
+                            style = MaterialTheme.typography.bodyMedium,
+                            fontWeight = FontWeight.Medium
+                    )
+
+                    Spacer(modifier = Modifier.height(8.dp))
+
+                    LazyRow(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                        item {
+                            FilterChip(
+                                    onClick = { selectedClimbType = null },
+                                    label = { Text("All Types") },
+                                    selected = selectedClimbType == null
+                            )
+                        }
+                        items(ClimbType.entries) { climbType ->
+                            FilterChip(
+                                    onClick = { selectedClimbType = climbType },
+                                    label = { Text(climbType.getDisplayName()) },
+                                    selected = selectedClimbType == climbType
+                            )
+                        }
+                    }
+
+                    Spacer(modifier = Modifier.height(12.dp))
+
+                    // Gym Filter
+                    Text(
+                            text = "Gym",
+                            style = MaterialTheme.typography.bodyMedium,
+                            fontWeight = FontWeight.Medium
+                    )
+
+                    Spacer(modifier = Modifier.height(8.dp))
+
+                    LazyRow(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                        item {
+                            FilterChip(
+                                    onClick = { selectedGym = null },
+                                    label = { Text("All Gyms") },
+                                    selected = selectedGym == null
+                            )
+                        }
+                        items(gyms) { gym ->
+                            FilterChip(
+                                    onClick = { selectedGym = gym },
+                                    label = { Text(gym.name) },
+                                    selected = selectedGym?.id == gym.id
+                            )
+                        }
+                    }
+
+                    // Filter result count
+                    if (selectedClimbType != null || selectedGym != null) {
+                        Spacer(modifier = Modifier.height(12.dp))
+                        Text(
+                                text =
+                                        "Showing ${filteredProblems.size} of ${problems.size} problems (${activeProblems.size} active, ${inactiveProblems.size} reset)",
+                                style = MaterialTheme.typography.bodySmall,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                    }
+                }
+            }
+
+            Spacer(modifier = Modifier.height(16.dp))
+        }
+
+        if (filteredProblems.isEmpty()) {
+            EmptyStateMessage(
+                    title =
+                            if (problems.isEmpty()) {
+                                if (gyms.isEmpty()) "No Gyms Available" else "No Problems Yet"
+                            } else {
+                                "No Problems Match Filters"
+                            },
+                    message =
+                            if (problems.isEmpty()) {
+                                if (gyms.isEmpty())
+                                        "Add a gym first to start tracking problems and routes!"
+                                else "Start tracking your favorite problems and routes!"
+                            } else {
+                                "Try adjusting your filters to see more problems."
+                            },
+                    onActionClick = {},
+                    actionText = ""
+            )
+        } else {
+            LazyColumn {
+                items(sortedProblems) { problem ->
+                    ProblemCard(
+                            problem = problem,
+                            gymName = gyms.find { it.id == problem.gymId }?.name ?: "Unknown Gym",
+                            onClick = { onNavigateToProblemDetail(problem.id) },
+                            onImageClick = { imagePaths, index ->
+                                selectedImagePaths = imagePaths
+                                selectedImageIndex = index
+                                showImageViewer = true
+                            },
+                            onToggleActive = {
+                                val updatedProblem = problem.copy(isActive = !problem.isActive)
+                                viewModel.updateProblem(updatedProblem)
+                            }
+                    )
+                    Spacer(modifier = Modifier.height(8.dp))
+                }
+            }
+        }
+    }
+
+    // Fullscreen Image Viewer
+    if (showImageViewer && selectedImagePaths.isNotEmpty()) {
+        FullscreenImageViewer(
+                imagePaths = selectedImagePaths,
+                initialIndex = selectedImageIndex,
+                onDismiss = { showImageViewer = false }
+        )
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun ProblemCard(
+        problem: Problem,
+        gymName: String,
+        onClick: () -> Unit,
+        onImageClick: ((List<String>, Int) -> Unit)? = null,
+        onToggleActive: (() -> Unit)? = null
+) {
+    Card(onClick = onClick, modifier = Modifier.fillMaxWidth()) {
+        Column(modifier = Modifier.fillMaxWidth().padding(16.dp)) {
+            Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.Top
+            ) {
+                Column(modifier = Modifier.weight(1f)) {
+                    Text(
+                            text = problem.name ?: "Unnamed Problem",
+                            style = MaterialTheme.typography.titleMedium,
+                            fontWeight = FontWeight.Bold,
+                            color =
+                                    if (problem.isActive) MaterialTheme.colorScheme.onSurface
+                                    else MaterialTheme.colorScheme.onSurface.copy(alpha = 0.6f)
+                    )
+
+                    Text(
+                            text = gymName,
+                            style = MaterialTheme.typography.bodyMedium,
+                            color =
+                                    MaterialTheme.colorScheme.onSurfaceVariant.copy(
+                                            alpha = if (problem.isActive) 1f else 0.6f
+                                    )
+                    )
+                }
+
+                Column(horizontalAlignment = Alignment.End) {
+                    Text(
+                            text = problem.difficulty.grade,
+                            style = MaterialTheme.typography.titleMedium,
+                            fontWeight = FontWeight.Bold,
+                            color = MaterialTheme.colorScheme.primary
+                    )
+
+                    Text(
+                            text = problem.climbType.getDisplayName(),
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+                }
+            }
+
+            problem.location?.let { location ->
+                Spacer(modifier = Modifier.height(4.dp))
+                Text(
+                        text = "Location: $location",
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            }
+
+            if (problem.tags.isNotEmpty()) {
+                Spacer(modifier = Modifier.height(8.dp))
+                Row {
+                    problem.tags.take(3).forEach { tag ->
+                        AssistChip(
+                                onClick = {},
+                                label = { Text(tag) },
+                                modifier = Modifier.padding(end = 4.dp)
+                        )
+                    }
+                }
+            }
+
+            // Display images if any
+            if (problem.imagePaths.isNotEmpty()) {
+                Spacer(modifier = Modifier.height(8.dp))
+                ImageDisplay(
+                        imagePaths = problem.imagePaths.take(3), // Show max 3 images in list
+                        imageSize = 60,
+                        onImageClick = { index -> onImageClick?.invoke(problem.imagePaths, index) }
+                )
+            }
+
+            if (!problem.isActive) {
+                Spacer(modifier = Modifier.height(8.dp))
+                Text(
+                        text = "Reset / No Longer Set",
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.tertiary,
+                        fontWeight = FontWeight.Medium
+                )
+            }
+
+            // Toggle active button
+            if (onToggleActive != null) {
+                Spacer(modifier = Modifier.height(8.dp))
+                OutlinedButton(
+                        onClick = onToggleActive,
+                        colors =
+                                ButtonDefaults.outlinedButtonColors(
+                                        contentColor =
+                                                if (problem.isActive)
+                                                        MaterialTheme.colorScheme.tertiary
+                                                else MaterialTheme.colorScheme.primary
+                                ),
+                        modifier = Modifier.fillMaxWidth()
+                ) {
+                    Text(
+                            text = if (problem.isActive) "Mark as Reset" else "Mark as Active",
+                            style = MaterialTheme.typography.bodySmall
+                    )
+                }
+            }
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/ui/screens/SessionsScreen.kt

@@ -0,0 +1,256 @@
+package com.atridad.openclimb.ui.screens
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.CheckCircle
+import androidx.compose.material.icons.filled.Warning
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import com.atridad.openclimb.R
+import com.atridad.openclimb.data.model.ClimbSession
+import com.atridad.openclimb.data.model.SessionStatus
+import com.atridad.openclimb.ui.components.ActiveSessionBanner
+import com.atridad.openclimb.ui.components.SyncIndicator
+import com.atridad.openclimb.ui.viewmodel.ClimbViewModel
+import java.time.LocalDateTime
+import java.time.format.DateTimeFormatter
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun SessionsScreen(viewModel: ClimbViewModel, onNavigateToSessionDetail: (String) -> Unit) {
+    val context = LocalContext.current
+    val sessions by viewModel.sessions.collectAsState()
+    val gyms by viewModel.gyms.collectAsState()
+    val activeSession by viewModel.activeSession.collectAsState()
+    val uiState by viewModel.uiState.collectAsState()
+
+    // Filter out active sessions from regular session list
+    val completedSessions = sessions.filter { it.status == SessionStatus.COMPLETED }
+    val activeSessionGym = activeSession?.let { session -> gyms.find { it.id == session.gymId } }
+
+    Column(modifier = Modifier.fillMaxSize().padding(16.dp)) {
+        Row(
+                modifier = Modifier.fillMaxWidth(),
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.spacedBy(12.dp)
+        ) {
+            Icon(
+                    painter = painterResource(id = R.drawable.ic_mountains),
+                    contentDescription = "OpenClimb Logo",
+                    modifier = Modifier.size(32.dp),
+                    tint = MaterialTheme.colorScheme.primary
+            )
+            Text(
+                    text = "Climbing Sessions",
+                    style = MaterialTheme.typography.headlineMedium,
+                    fontWeight = FontWeight.Bold,
+                    modifier = Modifier.weight(1f)
+            )
+            SyncIndicator(isSyncing = viewModel.syncService.isSyncing)
+        }
+
+        Spacer(modifier = Modifier.height(16.dp))
+
+        // Active session banner
+        ActiveSessionBanner(
+                activeSession = activeSession,
+                gym = activeSessionGym,
+                onSessionClick = { activeSession?.let { onNavigateToSessionDetail(it.id) } },
+                onEndSession = { activeSession?.let { viewModel.endSession(context, it.id) } }
+        )
+
+        if (activeSession != null) {
+            Spacer(modifier = Modifier.height(16.dp))
+        }
+
+        if (completedSessions.isEmpty() && activeSession == null) {
+            EmptyStateMessage(
+                    title = if (gyms.isEmpty()) "No Gyms Available" else "No Sessions Yet",
+                    message =
+                            if (gyms.isEmpty())
+                                    "Add a gym first to start tracking your climbing sessions!"
+                            else "Start your first climbing session!",
+                    onActionClick = {},
+                    actionText = ""
+            )
+        } else {
+            LazyColumn {
+                items(completedSessions) { session ->
+                    SessionCard(
+                            session = session,
+                            gymName = gyms.find { it.id == session.gymId }?.name ?: "Unknown Gym",
+                            onClick = { onNavigateToSessionDetail(session.id) }
+                    )
+                    Spacer(modifier = Modifier.height(8.dp))
+                }
+            }
+        }
+    }
+
+    // Show UI state messages and errors
+    uiState.message?.let { message ->
+        LaunchedEffect(message) {
+            kotlinx.coroutines.delay(5000)
+            viewModel.clearMessage()
+        }
+
+        Card(
+                modifier = Modifier.fillMaxWidth().padding(16.dp),
+                colors =
+                        CardDefaults.cardColors(
+                                containerColor = MaterialTheme.colorScheme.primaryContainer
+                        ),
+                shape = RoundedCornerShape(12.dp)
+        ) {
+            Row(
+                    modifier = Modifier.fillMaxWidth().padding(16.dp),
+                    verticalAlignment = Alignment.CenterVertically
+            ) {
+                Icon(
+                        Icons.Default.CheckCircle,
+                        contentDescription = null,
+                        tint = MaterialTheme.colorScheme.primary
+                )
+                Spacer(modifier = Modifier.width(8.dp))
+                Text(
+                        text = message,
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onPrimaryContainer
+                )
+            }
+        }
+    }
+
+    uiState.error?.let { error ->
+        LaunchedEffect(error) {
+            kotlinx.coroutines.delay(5000)
+            viewModel.clearError()
+        }
+
+        Card(
+                modifier = Modifier.fillMaxWidth().padding(16.dp),
+                colors =
+                        CardDefaults.cardColors(
+                                containerColor = MaterialTheme.colorScheme.errorContainer
+                        ),
+                shape = RoundedCornerShape(12.dp)
+        ) {
+            Row(
+                    modifier = Modifier.fillMaxWidth().padding(16.dp),
+                    verticalAlignment = Alignment.CenterVertically
+            ) {
+                Icon(
+                        Icons.Default.Warning,
+                        contentDescription = null,
+                        tint = MaterialTheme.colorScheme.error
+                )
+                Spacer(modifier = Modifier.width(8.dp))
+                Text(
+                        text = error,
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onErrorContainer
+                )
+            }
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun SessionCard(session: ClimbSession, gymName: String, onClick: () -> Unit) {
+    Card(onClick = onClick, modifier = Modifier.fillMaxWidth()) {
+        Column(modifier = Modifier.fillMaxWidth().padding(16.dp)) {
+            Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween
+            ) {
+                Text(
+                        text = gymName,
+                        style = MaterialTheme.typography.titleMedium,
+                        fontWeight = FontWeight.Bold
+                )
+                Text(
+                        text = formatDate(session.date),
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            }
+
+            Spacer(modifier = Modifier.height(4.dp))
+
+            session.duration?.let { duration ->
+                Text(
+                        text = "Duration: $duration minutes",
+                        style = MaterialTheme.typography.bodyMedium
+                )
+            }
+
+            session.notes?.let { notes ->
+                if (notes.isNotBlank()) {
+                    Spacer(modifier = Modifier.height(4.dp))
+                    Text(
+                            text = notes,
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                            maxLines = 2
+                    )
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun EmptyStateMessage(
+        title: String,
+        message: String,
+        onActionClick: () -> Unit,
+        actionText: String
+) {
+    Column(
+            modifier = Modifier.fillMaxSize(),
+            horizontalAlignment = Alignment.CenterHorizontally,
+            verticalArrangement = Arrangement.Center
+    ) {
+        Text(
+                text = title,
+                style = MaterialTheme.typography.headlineSmall,
+                fontWeight = FontWeight.Bold,
+                textAlign = TextAlign.Center
+        )
+
+        Spacer(modifier = Modifier.height(8.dp))
+
+        Text(
+                text = message,
+                style = MaterialTheme.typography.bodyLarge,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                textAlign = TextAlign.Center
+        )
+
+        if (actionText.isNotEmpty()) {
+            Spacer(modifier = Modifier.height(16.dp))
+
+            Button(onClick = onActionClick) { Text(actionText) }
+        }
+    }
+}
+
+private fun formatDate(dateString: String): String {
+    return try {
+        val date = LocalDateTime.parse(dateString.split("T")[0] + "T00:00:00")
+        date.format(DateTimeFormatter.ofPattern("MMM dd, yyyy"))
+    } catch (_: Exception) {
+        dateString
+    }
+}

android/app/src/main/java/com/atridad/openclimb/ui/screens/SettingsScreen.kt

@@ -0,0 +1,831 @@
+package com.atridad.openclimb.ui.screens
+
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.*
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import com.atridad.openclimb.R
+import com.atridad.openclimb.ui.components.SyncIndicator
+import com.atridad.openclimb.ui.viewmodel.ClimbViewModel
+import java.io.File
+import java.time.Instant
+import kotlinx.coroutines.launch
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun SettingsScreen(viewModel: ClimbViewModel) {
+    val uiState by viewModel.uiState.collectAsState()
+    val context = LocalContext.current
+    val coroutineScope = rememberCoroutineScope()
+
+    // Sync service state
+    val syncService = viewModel.syncService
+    val isSyncing by syncService.isSyncing.collectAsState()
+    val isConnected by syncService.isConnected.collectAsState()
+    val isTesting by syncService.isTesting.collectAsState()
+    val lastSyncTime by syncService.lastSyncTime.collectAsState()
+    val syncError by syncService.syncError.collectAsState()
+
+    // State for dialogs
+    var showResetDialog by remember { mutableStateOf(false) }
+    var showSyncConfigDialog by remember { mutableStateOf(false) }
+    var showDisconnectDialog by remember { mutableStateOf(false) }
+
+    // Sync configuration state
+    var serverUrl by remember { mutableStateOf(syncService.serverURL) }
+    var authToken by remember { mutableStateOf(syncService.authToken) }
+
+    val packageInfo = remember { context.packageManager.getPackageInfo(context.packageName, 0) }
+    val appVersion = packageInfo.versionName
+
+    // File picker launcher for import - only accepts ZIP files
+    val importLauncher =
+            rememberLauncherForActivityResult(contract = ActivityResultContracts.GetContent()) { uri
+                ->
+                uri?.let {
+                    try {
+                        val inputStream = context.contentResolver.openInputStream(uri)
+                        // Determine file extension from content resolver
+                        val fileName =
+                                context.contentResolver.query(uri, null, null, null, null)?.use {
+                                        cursor ->
+                                    val nameIndex =
+                                            cursor.getColumnIndex(
+                                                    android.provider.OpenableColumns.DISPLAY_NAME
+                                            )
+                                    if (nameIndex >= 0 && cursor.moveToFirst()) {
+                                        cursor.getString(nameIndex)
+                                    } else null
+                                }
+                                        ?: "import_file"
+
+                        // Only allow ZIP files
+                        if (!fileName.lowercase().endsWith(".zip")) {
+                            viewModel.setError(
+                                    "Only ZIP files are supported for import. Please use a ZIP file exported from OpenClimb."
+                            )
+                            return@let
+                        }
+
+                        val tempFile = File(context.cacheDir, "temp_import.zip")
+
+                        inputStream?.use { input ->
+                            tempFile.outputStream().use { output -> input.copyTo(output) }
+                        }
+                        viewModel.importData(tempFile)
+                    } catch (e: Exception) {
+                        viewModel.setError("Failed to read file: ${e.message}")
+                    }
+                }
+            }
+
+    // File picker launcher for export - ZIP format with images
+    val exportZipLauncher =
+            rememberLauncherForActivityResult(
+                    contract = ActivityResultContracts.CreateDocument("application/zip")
+            ) { uri ->
+                uri?.let {
+                    try {
+                        viewModel.exportDataToZipUri(context, uri)
+                    } catch (e: Exception) {
+                        viewModel.setError("Failed to save file: ${e.message}")
+                    }
+                }
+            }
+
+    LazyColumn(
+            modifier = Modifier.fillMaxSize().padding(16.dp),
+            verticalArrangement = Arrangement.spacedBy(16.dp)
+    ) {
+        item {
+            Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.spacedBy(12.dp)
+            ) {
+                Icon(
+                        painter = painterResource(id = R.drawable.ic_mountains),
+                        contentDescription = "OpenClimb Logo",
+                        modifier = Modifier.size(32.dp),
+                        tint = MaterialTheme.colorScheme.primary
+                )
+                Text(
+                        text = "Settings",
+                        style = MaterialTheme.typography.headlineMedium,
+                        fontWeight = FontWeight.Bold,
+                        modifier = Modifier.weight(1f)
+                )
+                SyncIndicator(isSyncing = viewModel.syncService.isSyncing)
+            }
+        }
+
+        // Sync Section
+        item {
+            Card(modifier = Modifier.fillMaxWidth(), shape = RoundedCornerShape(16.dp)) {
+                Column(modifier = Modifier.fillMaxWidth().padding(16.dp)) {
+                    Text(
+                            text = "Sync",
+                            style = MaterialTheme.typography.titleMedium,
+                            fontWeight = FontWeight.Bold
+                    )
+
+                    Spacer(modifier = Modifier.height(12.dp))
+
+                    if (syncService.isConfigured) {
+                        // Connected state
+                        Card(
+                                shape = RoundedCornerShape(12.dp),
+                                colors =
+                                        CardDefaults.cardColors(
+                                                containerColor =
+                                                        if (isConnected)
+                                                                MaterialTheme.colorScheme
+                                                                        .primaryContainer.copy(
+                                                                        alpha = 0.3f
+                                                                )
+                                                        else
+                                                                MaterialTheme.colorScheme
+                                                                        .surfaceVariant.copy(
+                                                                        alpha = 0.3f
+                                                                )
+                                        )
+                        ) {
+                            ListItem(
+                                    headlineContent = {
+                                        Text(
+                                                if (isConnected) "Connected to Server"
+                                                else "Server Configured"
+                                        )
+                                    },
+                                    supportingContent = {
+                                        Column {
+                                            Text("Server: ${syncService.serverURL}")
+                                            lastSyncTime?.let { time ->
+                                                Text(
+                                                        "Last sync: ${
+                                                    try {
+                                                        Instant.parse(time).toString()
+                                                    } catch (_: Exception) {
+                                                        time
+                                                    }
+                                                }",
+                                                        style = MaterialTheme.typography.bodySmall
+                                                )
+                                            }
+                                        }
+                                    },
+                                    leadingContent = {
+                                        Icon(
+                                                if (isConnected) Icons.Default.CloudDone
+                                                else Icons.Default.Cloud,
+                                                contentDescription = null,
+                                                tint =
+                                                        if (isConnected)
+                                                                MaterialTheme.colorScheme.primary
+                                                        else
+                                                                MaterialTheme.colorScheme
+                                                                        .onSurfaceVariant
+                                        )
+                                    },
+                                    trailingContent = {
+                                        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                                            // Manual Sync Button
+                                            TextButton(
+                                                    onClick = {
+                                                        coroutineScope.launch {
+                                                            viewModel.performManualSync()
+                                                        }
+                                                    },
+                                                    enabled = isConnected && !isSyncing
+                                            ) {
+                                                if (isSyncing) {
+                                                    CircularProgressIndicator(
+                                                            modifier = Modifier.size(16.dp),
+                                                            strokeWidth = 2.dp
+                                                    )
+                                                } else {
+                                                    Text("Sync")
+                                                }
+                                            }
+
+                                            // Configure Button
+                                            TextButton(onClick = { showSyncConfigDialog = true }) {
+                                                Text("Configure")
+                                            }
+                                        }
+                                    }
+                            )
+                        }
+
+                        Spacer(modifier = Modifier.height(8.dp))
+
+                        // Auto-sync settings
+                        Card(
+                                shape = RoundedCornerShape(12.dp),
+                                colors =
+                                        CardDefaults.cardColors(
+                                                containerColor =
+                                                        MaterialTheme.colorScheme.surfaceVariant
+                                                                .copy(alpha = 0.3f)
+                                        )
+                        ) {
+                            Column(modifier = Modifier.padding(16.dp)) {
+                                Text(
+                                        text = "Sync Mode",
+                                        style = MaterialTheme.typography.bodyMedium,
+                                        fontWeight = FontWeight.Medium
+                                )
+
+                                Spacer(modifier = Modifier.height(8.dp))
+
+                                Row(
+                                        modifier = Modifier.fillMaxWidth(),
+                                        verticalAlignment = Alignment.CenterVertically
+                                ) {
+                                    Column(modifier = Modifier.weight(1f)) {
+                                        Text("Auto-sync")
+                                        Text(
+                                                text =
+                                                        "Sync automatically on app launch and data changes",
+                                                style = MaterialTheme.typography.bodySmall,
+                                                color =
+                                                        MaterialTheme.colorScheme.onSurface.copy(
+                                                                alpha = 0.7f
+                                                        ),
+                                                maxLines = 2
+                                        )
+                                    }
+                                    Spacer(modifier = Modifier.width(16.dp))
+                                    Switch(
+                                            checked = syncService.isAutoSyncEnabled,
+                                            onCheckedChange = { syncService.isAutoSyncEnabled = it }
+                                    )
+                                }
+                            }
+                        }
+
+                        Spacer(modifier = Modifier.height(8.dp))
+
+                        // Disconnect option
+                        Card(
+                                shape = RoundedCornerShape(12.dp),
+                                colors =
+                                        CardDefaults.cardColors(
+                                                containerColor =
+                                                        MaterialTheme.colorScheme.errorContainer
+                                                                .copy(alpha = 0.3f)
+                                        )
+                        ) {
+                            ListItem(
+                                    headlineContent = { Text("Disconnect") },
+                                    supportingContent = { Text("Clear sync configuration") },
+                                    leadingContent = {
+                                        Icon(
+                                                Icons.Default.CloudOff,
+                                                contentDescription = null,
+                                                tint = MaterialTheme.colorScheme.error
+                                        )
+                                    },
+                                    trailingContent = {
+                                        TextButton(onClick = { showDisconnectDialog = true }) {
+                                            Text(
+                                                    "Disconnect",
+                                                    color = MaterialTheme.colorScheme.error
+                                            )
+                                        }
+                                    }
+                            )
+                        }
+                    } else {
+                        // Not configured state
+                        Card(
+                                shape = RoundedCornerShape(12.dp),
+                                colors =
+                                        CardDefaults.cardColors(
+                                                containerColor =
+                                                        MaterialTheme.colorScheme.surfaceVariant
+                                                                .copy(alpha = 0.3f)
+                                        )
+                        ) {
+                            ListItem(
+                                    headlineContent = { Text("Setup Sync") },
+                                    supportingContent = {
+                                        Text("Connect to your OpenClimb sync server")
+                                    },
+                                    leadingContent = {
+                                        Icon(Icons.Default.CloudSync, contentDescription = null)
+                                    },
+                                    trailingContent = {
+                                        TextButton(onClick = { showSyncConfigDialog = true }) {
+                                            Text("Setup")
+                                        }
+                                    }
+                            )
+                        }
+                    }
+
+                    // Show sync error if any
+                    syncError?.let { error ->
+                        Spacer(modifier = Modifier.height(8.dp))
+                        Card(
+                                shape = RoundedCornerShape(12.dp),
+                                colors =
+                                        CardDefaults.cardColors(
+                                                containerColor =
+                                                        MaterialTheme.colorScheme.errorContainer
+                                        )
+                        ) {
+                            Row(
+                                    modifier = Modifier.fillMaxWidth().padding(12.dp),
+                                    verticalAlignment = Alignment.CenterVertically
+                            ) {
+                                Icon(
+                                        Icons.Default.Warning,
+                                        contentDescription = null,
+                                        tint = MaterialTheme.colorScheme.error
+                                )
+                                Spacer(modifier = Modifier.width(8.dp))
+                                Text(
+                                        text = error,
+                                        style = MaterialTheme.typography.bodySmall,
+                                        color = MaterialTheme.colorScheme.onErrorContainer
+                                )
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        // Data Management Section
+        item {
+            Card(modifier = Modifier.fillMaxWidth(), shape = RoundedCornerShape(16.dp)) {
+                Column(modifier = Modifier.fillMaxWidth().padding(16.dp)) {
+                    Text(
+                            text = "Data Management",
+                            style = MaterialTheme.typography.titleMedium,
+                            fontWeight = FontWeight.Bold
+                    )
+
+                    Spacer(modifier = Modifier.height(12.dp))
+
+                    // Export Data
+                    Card(
+                            shape = RoundedCornerShape(12.dp),
+                            colors =
+                                    CardDefaults.cardColors(
+                                            containerColor =
+                                                    MaterialTheme.colorScheme.surfaceVariant.copy(
+                                                            alpha = 0.3f
+                                                    )
+                                    )
+                    ) {
+                        ListItem(
+                                headlineContent = { Text("Export Data with Images") },
+                                supportingContent = {
+                                    Text(
+                                            "Export all your climbing data and images to ZIP file (recommended)"
+                                    )
+                                },
+                                leadingContent = {
+                                    Icon(Icons.Default.Share, contentDescription = null)
+                                },
+                                trailingContent = {
+                                    TextButton(
+                                            onClick = {
+                                                val defaultFileName =
+                                                        "openclimb_export_${
+                                            java.time.LocalDateTime.now()
+                                                .toString()
+                                                .replace(":", "-")
+                                                .replace(".", "-")
+                                        }.zip"
+                                                exportZipLauncher.launch(defaultFileName)
+                                            },
+                                            enabled = !uiState.isLoading
+                                    ) {
+                                        if (uiState.isLoading) {
+                                            CircularProgressIndicator(
+                                                    modifier = Modifier.size(16.dp),
+                                                    strokeWidth = 2.dp
+                                            )
+                                        } else {
+                                            Text("Export ZIP")
+                                        }
+                                    }
+                                }
+                        )
+                    }
+
+                    Spacer(modifier = Modifier.height(8.dp))
+
+                    Card(
+                            shape = RoundedCornerShape(12.dp),
+                            colors =
+                                    CardDefaults.cardColors(
+                                            containerColor =
+                                                    MaterialTheme.colorScheme.surfaceVariant.copy(
+                                                            alpha = 0.3f
+                                                    )
+                                    )
+                    ) {
+                        ListItem(
+                                headlineContent = { Text("Import Data") },
+                                supportingContent = {
+                                    Text("Import climbing data from ZIP file (recommended format)")
+                                },
+                                leadingContent = {
+                                    Icon(Icons.Default.Add, contentDescription = null)
+                                },
+                                trailingContent = {
+                                    TextButton(
+                                            onClick = { importLauncher.launch("application/zip") },
+                                            enabled = !uiState.isLoading
+                                    ) {
+                                        if (uiState.isLoading) {
+                                            CircularProgressIndicator(
+                                                    modifier = Modifier.size(16.dp),
+                                                    strokeWidth = 2.dp
+                                            )
+                                        } else {
+                                            Text("Import")
+                                        }
+                                    }
+                                }
+                        )
+                    }
+
+                    Spacer(modifier = Modifier.height(8.dp))
+
+                    Card(
+                            shape = RoundedCornerShape(12.dp),
+                            colors =
+                                    CardDefaults.cardColors(
+                                            containerColor =
+                                                    MaterialTheme.colorScheme.errorContainer.copy(
+                                                            alpha = 0.3f
+                                                    )
+                                    )
+                    ) {
+                        ListItem(
+                                headlineContent = { Text("Reset All Data") },
+                                supportingContent = {
+                                    Text(
+                                            "Permanently delete all gyms, problems, sessions, attempts, and images"
+                                    )
+                                },
+                                leadingContent = {
+                                    Icon(
+                                            Icons.Default.Delete,
+                                            contentDescription = null,
+                                            tint = MaterialTheme.colorScheme.error
+                                    )
+                                },
+                                trailingContent = {
+                                    TextButton(
+                                            onClick = { showResetDialog = true },
+                                            enabled = !uiState.isLoading
+                                    ) {
+                                        if (uiState.isLoading) {
+                                            CircularProgressIndicator(
+                                                    modifier = Modifier.size(16.dp),
+                                                    strokeWidth = 2.dp
+                                            )
+                                        } else {
+                                            Text("Reset", color = MaterialTheme.colorScheme.error)
+                                        }
+                                    }
+                                }
+                        )
+                    }
+                }
+            }
+        }
+
+        // App Information Section
+        item {
+            Card(modifier = Modifier.fillMaxWidth(), shape = RoundedCornerShape(16.dp)) {
+                Column(modifier = Modifier.fillMaxWidth().padding(16.dp)) {
+                    Text(
+                            text = "App Information",
+                            style = MaterialTheme.typography.titleMedium,
+                            fontWeight = FontWeight.Bold
+                    )
+
+                    Spacer(modifier = Modifier.height(12.dp))
+
+                    Card(
+                            shape = RoundedCornerShape(12.dp),
+                            colors =
+                                    CardDefaults.cardColors(
+                                            containerColor =
+                                                    MaterialTheme.colorScheme.surfaceVariant.copy(
+                                                            alpha = 0.3f
+                                                    )
+                                    )
+                    ) {
+                        ListItem(
+                                headlineContent = {
+                                    Row(
+                                            verticalAlignment = Alignment.CenterVertically,
+                                            horizontalArrangement = Arrangement.spacedBy(8.dp)
+                                    ) {
+                                        Icon(
+                                                painter =
+                                                        painterResource(
+                                                                id = R.drawable.ic_mountains
+                                                        ),
+                                                contentDescription = "OpenClimb Logo",
+                                                modifier = Modifier.size(24.dp),
+                                                tint = MaterialTheme.colorScheme.primary
+                                        )
+                                        Text("OpenClimb")
+                                    }
+                                },
+                                supportingContent = { Text("Track your climbing progress") },
+                                leadingContent = {}
+                        )
+                    }
+
+                    Spacer(modifier = Modifier.height(8.dp))
+
+                    Card(
+                            shape = RoundedCornerShape(12.dp),
+                            colors =
+                                    CardDefaults.cardColors(
+                                            containerColor =
+                                                    MaterialTheme.colorScheme.surfaceVariant.copy(
+                                                            alpha = 0.3f
+                                                    )
+                                    )
+                    ) {
+                        ListItem(
+                                headlineContent = { Text("Version") },
+                                supportingContent = { Text(appVersion ?: "Unknown") },
+                                leadingContent = {
+                                    Icon(Icons.Default.Info, contentDescription = null)
+                                }
+                        )
+                    }
+                }
+            }
+        }
+    }
+
+    // Show loading/message states
+    if (uiState.isLoading) {
+        Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+            CircularProgressIndicator()
+        }
+    }
+
+    uiState.message?.let { message ->
+        LaunchedEffect(message) {
+            kotlinx.coroutines.delay(5000)
+            viewModel.clearMessage()
+        }
+
+        Card(
+                modifier = Modifier.fillMaxWidth().padding(16.dp),
+                colors =
+                        CardDefaults.cardColors(
+                                containerColor = MaterialTheme.colorScheme.primaryContainer
+                        ),
+                shape = RoundedCornerShape(12.dp)
+        ) {
+            Row(
+                    modifier = Modifier.fillMaxWidth().padding(16.dp),
+                    verticalAlignment = Alignment.CenterVertically
+            ) {
+                Icon(
+                        Icons.Default.CheckCircle,
+                        contentDescription = null,
+                        tint = MaterialTheme.colorScheme.primary
+                )
+                Spacer(modifier = Modifier.width(8.dp))
+                Text(
+                        text = message,
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onPrimaryContainer
+                )
+            }
+        }
+    }
+
+    uiState.error?.let { error ->
+        LaunchedEffect(error) {
+            kotlinx.coroutines.delay(5000)
+            viewModel.clearError()
+        }
+
+        Card(
+                modifier = Modifier.fillMaxWidth().padding(16.dp),
+                colors =
+                        CardDefaults.cardColors(
+                                containerColor = MaterialTheme.colorScheme.errorContainer
+                        ),
+                shape = RoundedCornerShape(12.dp)
+        ) {
+            Row(
+                    modifier = Modifier.fillMaxWidth().padding(16.dp),
+                    verticalAlignment = Alignment.CenterVertically
+            ) {
+                Icon(
+                        Icons.Default.Warning,
+                        contentDescription = null,
+                        tint = MaterialTheme.colorScheme.error
+                )
+                Spacer(modifier = Modifier.width(8.dp))
+                Text(
+                        text = error,
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onErrorContainer
+                )
+            }
+        }
+    }
+
+    // Reset confirmation dialog
+    if (showResetDialog) {
+        AlertDialog(
+                onDismissRequest = { showResetDialog = false },
+                title = { Text("Reset All Data") },
+                text = {
+                    Column {
+                        Text("Are you sure you want to reset all data?")
+                        Spacer(modifier = Modifier.height(8.dp))
+                        Text(
+                                text = "This will permanently delete:",
+                                style = MaterialTheme.typography.bodySmall,
+                                fontWeight = FontWeight.Medium
+                        )
+                        Spacer(modifier = Modifier.height(4.dp))
+                        Text(
+                                text =
+                                        "• All gyms and their information\n• All problems and their images\n• All climbing sessions\n• All attempts and progress data",
+                                style = MaterialTheme.typography.bodySmall,
+                                color = MaterialTheme.colorScheme.error
+                        )
+                        Spacer(modifier = Modifier.height(8.dp))
+                        Text(
+                                text =
+                                        "This action cannot be undone. Consider exporting your data first.",
+                                style = MaterialTheme.typography.bodySmall,
+                                fontWeight = FontWeight.Medium,
+                                color = MaterialTheme.colorScheme.error
+                        )
+                    }
+                },
+                confirmButton = {
+                    TextButton(
+                            onClick = {
+                                viewModel.resetAllData()
+                                showResetDialog = false
+                            }
+                    ) { Text("Reset All Data", color = MaterialTheme.colorScheme.error) }
+                },
+                dismissButton = {
+                    TextButton(onClick = { showResetDialog = false }) { Text("Cancel") }
+                }
+        )
+    }
+
+    // Sync Configuration Dialog
+    if (showSyncConfigDialog) {
+        AlertDialog(
+                onDismissRequest = { showSyncConfigDialog = false },
+                title = { Text("Sync Configuration") },
+                text = {
+                    Column {
+                        OutlinedTextField(
+                                value = serverUrl,
+                                onValueChange = { serverUrl = it },
+                                label = { Text("Server URL") },
+                                placeholder = { Text("https://your-server.com") },
+                                modifier = Modifier.fillMaxWidth(),
+                                singleLine = true
+                        )
+
+                        Spacer(modifier = Modifier.height(8.dp))
+
+                        OutlinedTextField(
+                                value = authToken,
+                                onValueChange = { authToken = it },
+                                label = { Text("Auth Token") },
+                                placeholder = { Text("your-secret-token") },
+                                modifier = Modifier.fillMaxWidth(),
+                                singleLine = true
+                        )
+
+                        Spacer(modifier = Modifier.height(16.dp))
+
+                        if (syncService.isConfigured) {
+                            Text(
+                                    text = "Test connection before enabling sync features",
+                                    style = MaterialTheme.typography.bodySmall,
+                                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                            )
+                        } else {
+                            Text(
+                                    text = "Enter your server URL and auth token to enable sync",
+                                    style = MaterialTheme.typography.bodySmall,
+                                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                            )
+                        }
+                    }
+                },
+                confirmButton = {
+                    Row {
+                        if (syncService.isConfigured) {
+                            TextButton(
+                                    onClick = {
+                                        coroutineScope.launch {
+                                            try {
+                                                // Save configuration first
+                                                syncService.serverURL = serverUrl.trim()
+                                                syncService.authToken = authToken.trim()
+                                                viewModel.testSyncConnection()
+                                                showSyncConfigDialog = false
+                                            } catch (_: Exception) {
+                                                // Error will be shown via syncError state
+                                            }
+                                        }
+                                    },
+                                    enabled =
+                                            !isTesting &&
+                                                    serverUrl.isNotBlank() &&
+                                                    authToken.isNotBlank()
+                            ) {
+                                if (isTesting) {
+                                    CircularProgressIndicator(
+                                            modifier = Modifier.size(16.dp),
+                                            strokeWidth = 2.dp
+                                    )
+                                } else {
+                                    Text("Test Connection")
+                                }
+                            }
+
+                            Spacer(modifier = Modifier.width(8.dp))
+                        }
+
+                        TextButton(
+                                onClick = {
+                                    syncService.serverURL = serverUrl.trim()
+                                    syncService.authToken = authToken.trim()
+                                    showSyncConfigDialog = false
+                                },
+                                enabled = serverUrl.isNotBlank() && authToken.isNotBlank()
+                        ) { Text("Save") }
+                    }
+                },
+                dismissButton = {
+                    TextButton(
+                            onClick = {
+                                // Reset to current values
+                                serverUrl = syncService.serverURL
+                                authToken = syncService.authToken
+                                showSyncConfigDialog = false
+                            }
+                    ) { Text("Cancel") }
+                }
+        )
+    }
+
+    // Disconnect Dialog
+    if (showDisconnectDialog) {
+        AlertDialog(
+                onDismissRequest = { showDisconnectDialog = false },
+                title = { Text("Disconnect from Sync") },
+                text = {
+                    Text(
+                            "Are you sure you want to disconnect from the sync server? This will clear your server configuration and disable auto-sync."
+                    )
+                },
+                confirmButton = {
+                    TextButton(
+                            onClick = {
+                                syncService.clearConfiguration()
+                                serverUrl = ""
+                                authToken = ""
+                                showDisconnectDialog = false
+                            }
+                    ) { Text("Disconnect", color = MaterialTheme.colorScheme.error) }
+                },
+                dismissButton = {
+                    TextButton(onClick = { showDisconnectDialog = false }) { Text("Cancel") }
+                }
+        )
+    }
+}

android/app/src/main/java/com/atridad/openclimb/ui/theme/Color.kt

@@ -0,0 +1,66 @@
+package com.atridad.openclimb.ui.theme
+
+import androidx.compose.ui.graphics.Color
+
+// Climbing-themed Material You color palette
+// Orange - Primary (represents rock/sandstone climbing)
+val ClimbOrange10 = Color(0xFF1F0E00)
+val ClimbOrange20 = Color(0xFF3E1C00)
+val ClimbOrange30 = Color(0xFF5D2B00)
+val ClimbOrange40 = Color(0xFF7C3900)
+val ClimbOrange80 = Color(0xFFFFB786)
+val ClimbOrange90 = Color(0xFFFFDCC2)
+val ClimbOrange100 = Color(0xFFFFFFFF)
+
+// Grey - Secondary (represents granite/slate)
+val ClimbGrey10 = Color(0xFF1F1F1F)
+val ClimbGrey20 = Color(0xFF2F2F2F)
+val ClimbGrey30 = Color(0xFF484848)
+val ClimbGrey40 = Color(0xFF606060)
+val ClimbGrey80 = Color(0xFFC7C7C7)
+val ClimbGrey90 = Color(0xFFE3E3E3)
+val ClimbGrey100 = Color(0xFFFFFFFF)
+
+// Blue - Tertiary (represents ice/water)
+val ClimbBlue10 = Color(0xFF001F2A)
+val ClimbBlue20 = Color(0xFF003544)
+val ClimbBlue30 = Color(0xFF004D61)
+val ClimbBlue40 = Color(0xFF00677F)
+val ClimbBlue80 = Color(0xFF5DDBFF)
+val ClimbBlue90 = Color(0xFFB8EAFF)
+val ClimbBlue100 = Color(0xFFFFFFFF)
+
+// Red - Error colors
+val ClimbRed10 = Color(0xFF410001)
+val ClimbRed20 = Color(0xFF680003)
+val ClimbRed30 = Color(0xFF930006)
+val ClimbRed40 = Color(0xFFBA1B1B)
+val ClimbRed80 = Color(0xFFFFB4A9)
+val ClimbRed90 = Color(0xFFFFDAD4)
+val ClimbRed100 = Color(0xFFFFFFFF)
+
+// Neutral colors for surfaces
+val ClimbNeutral0 = Color(0xFF000000)
+val ClimbNeutral4 = Color(0xFF0F0F0F)
+val ClimbNeutral6 = Color(0xFF141414)
+val ClimbNeutral10 = Color(0xFF1F1F1F)
+val ClimbNeutral12 = Color(0xFF232323)
+val ClimbNeutral17 = Color(0xFF2C2C2C)
+val ClimbNeutral20 = Color(0xFF313131)
+val ClimbNeutral22 = Color(0xFF363636)
+val ClimbNeutral24 = Color(0xFF393939)
+val ClimbNeutral87 = Color(0xFFDDDDDD)
+val ClimbNeutral90 = Color(0xFFE6E6E6)
+val ClimbNeutral92 = Color(0xFFEBEBEB)
+val ClimbNeutral94 = Color(0xFFF0F0F0)
+val ClimbNeutral95 = Color(0xFFF3F3F3)
+val ClimbNeutral96 = Color(0xFFF5F5F5)
+val ClimbNeutral98 = Color(0xFFFAFAFA)
+val ClimbNeutral100 = Color(0xFFFFFFFF)
+
+// Neutral variant colors for outlines and variants
+val ClimbNeutralVariant30 = Color(0xFF484848)
+val ClimbNeutralVariant50 = Color(0xFF797979)
+val ClimbNeutralVariant60 = Color(0xFF939393)
+val ClimbNeutralVariant80 = Color(0xFFC7C7C7)
+val ClimbNeutralVariant90 = Color(0xFFE3E3E3)

android/app/src/main/java/com/atridad/openclimb/ui/theme/CustomIcons.kt

@@ -0,0 +1,25 @@
+package com.atridad.openclimb.ui.theme
+
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.SolidColor
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.graphics.vector.path
+import androidx.compose.ui.unit.dp
+
+object CustomIcons {
+    fun Stop(color: Color = Color.Black): ImageVector = ImageVector.Builder(
+        name = "Stop",
+        defaultWidth = 24.dp,
+        defaultHeight = 24.dp,
+        viewportWidth = 24f,
+        viewportHeight = 24f
+    ).path(
+        fill = SolidColor(color)
+    ) {
+        moveTo(6f, 6f)
+        horizontalLineTo(18f)
+        verticalLineTo(18f)
+        horizontalLineTo(6f)
+        close()
+    }.build()
+}

android/app/src/main/java/com/atridad/openclimb/ui/theme/Theme.kt

@@ -0,0 +1,121 @@
+package com.atridad.openclimb.ui.theme
+
+import android.app.Activity
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.material3.dynamicDarkColorScheme
+import androidx.compose.material3.dynamicLightColorScheme
+import androidx.compose.material3.lightColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.SideEffect
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalView
+import androidx.core.view.WindowCompat
+
+// Climbing-themed dark color scheme with full Material You compatibility
+private val DarkColorScheme = darkColorScheme(
+    primary = ClimbOrange80,
+    onPrimary = ClimbOrange20,
+    primaryContainer = ClimbOrange30,
+    onPrimaryContainer = ClimbOrange90,
+    secondary = ClimbGrey80,
+    onSecondary = ClimbGrey20,
+    secondaryContainer = ClimbGrey30,
+    onSecondaryContainer = ClimbGrey90,
+    tertiary = ClimbBlue80,
+    onTertiary = ClimbBlue20,
+    tertiaryContainer = ClimbBlue30,
+    onTertiaryContainer = ClimbBlue90,
+    error = ClimbRed80,
+    onError = ClimbRed20,
+    errorContainer = ClimbRed30,
+    onErrorContainer = ClimbRed90,
+    surface = ClimbNeutral10,
+    onSurface = ClimbNeutral90,
+    surfaceVariant = ClimbNeutralVariant30,
+    onSurfaceVariant = ClimbNeutralVariant80,
+    outline = ClimbNeutralVariant60,
+    outlineVariant = ClimbNeutralVariant30,
+    scrim = ClimbNeutral0,
+    inverseSurface = ClimbNeutral90,
+    inverseOnSurface = ClimbNeutral20,
+    inversePrimary = ClimbOrange40,
+    surfaceDim = ClimbNeutral6,
+    surfaceBright = ClimbNeutral24,
+    surfaceContainerLowest = ClimbNeutral4,
+    surfaceContainerLow = ClimbNeutral10,
+    surfaceContainer = ClimbNeutral12,
+    surfaceContainerHigh = ClimbNeutral17,
+    surfaceContainerHighest = ClimbNeutral22
+)
+
+// Climbing-themed light color scheme with full Material You compatibility
+private val LightColorScheme = lightColorScheme(
+    primary = ClimbOrange40,
+    onPrimary = ClimbOrange100,
+    primaryContainer = ClimbOrange90,
+    onPrimaryContainer = ClimbOrange10,
+    secondary = ClimbGrey40,
+    onSecondary = ClimbGrey100,
+    secondaryContainer = ClimbGrey90,
+    onSecondaryContainer = ClimbGrey10,
+    tertiary = ClimbBlue40,
+    onTertiary = ClimbBlue100,
+    tertiaryContainer = ClimbBlue90,
+    onTertiaryContainer = ClimbBlue10,
+    error = ClimbRed40,
+    onError = ClimbRed100,
+    errorContainer = ClimbRed90,
+    onErrorContainer = ClimbRed10,
+    surface = ClimbNeutral98,
+    onSurface = ClimbNeutral10,
+    surfaceVariant = ClimbNeutralVariant90,
+    onSurfaceVariant = ClimbNeutralVariant30,
+    outline = ClimbNeutralVariant50,
+    outlineVariant = ClimbNeutralVariant80,
+    scrim = ClimbNeutral0,
+    inverseSurface = ClimbNeutral20,
+    inverseOnSurface = ClimbNeutral95,
+    inversePrimary = ClimbOrange80,
+    surfaceDim = ClimbNeutral87,
+    surfaceBright = ClimbNeutral98,
+    surfaceContainerLowest = ClimbNeutral100,
+    surfaceContainerLow = ClimbNeutral96,
+    surfaceContainer = ClimbNeutral94,
+    surfaceContainerHigh = ClimbNeutral92,
+    surfaceContainerHighest = ClimbNeutral90
+)
+
+@Composable
+fun OpenClimbTheme(
+    darkTheme: Boolean = isSystemInDarkTheme(),
+    // Dynamic color is available on Android 12+ and provides full Material You theming
+    // When enabled, it adapts to the user's system wallpaper colors
+    dynamicColor: Boolean = true,
+    content: @Composable () -> Unit
+) {
+    val colorScheme = when {
+        dynamicColor && true -> {
+            val context = LocalContext.current
+            if (darkTheme) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context)
+        }
+        darkTheme -> DarkColorScheme
+        else -> LightColorScheme
+    }
+    
+    val view = LocalView.current
+    if (!view.isInEditMode) {
+        SideEffect {
+            val window = (view.context as Activity).window
+            WindowCompat.setDecorFitsSystemWindows(window, false)
+            WindowCompat.getInsetsController(window, view).isAppearanceLightStatusBars = !darkTheme
+        }
+    }
+
+    MaterialTheme(
+        colorScheme = colorScheme,
+        typography = Typography,
+        content = content
+    )
+}

android/app/src/main/java/com/atridad/openclimb/ui/theme/Type.kt

@@ -0,0 +1,18 @@
+package com.atridad.openclimb.ui.theme
+
+import androidx.compose.material3.Typography
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.sp
+
+// Set of Material typography styles to start with
+val Typography = Typography(
+    bodyLarge = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Normal,
+        fontSize = 16.sp,
+        lineHeight = 24.sp,
+        letterSpacing = 0.5.sp
+    )
+)

android/app/src/main/java/com/atridad/openclimb/ui/viewmodel/ClimbViewModel.kt

@@ -0,0 +1,464 @@
+package com.atridad.openclimb.ui.viewmodel
+
+import android.content.Context
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.atridad.openclimb.data.model.*
+import com.atridad.openclimb.data.repository.ClimbRepository
+import com.atridad.openclimb.data.sync.SyncService
+import com.atridad.openclimb.service.SessionTrackingService
+import com.atridad.openclimb.utils.ImageUtils
+import com.atridad.openclimb.utils.SessionShareUtils
+import com.atridad.openclimb.widget.ClimbStatsWidgetProvider
+import java.io.File
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+
+class ClimbViewModel(private val repository: ClimbRepository, val syncService: SyncService) :
+        ViewModel() {
+
+    // UI State flows
+    private val _uiState = MutableStateFlow(ClimbUiState())
+    val uiState: StateFlow<ClimbUiState> = _uiState.asStateFlow()
+
+    // Data flows
+    val gyms =
+            repository
+                    .getAllGyms()
+                    .stateIn(
+                            scope = viewModelScope,
+                            started = SharingStarted.WhileSubscribed(),
+                            initialValue = emptyList()
+                    )
+
+    val problems =
+            repository
+                    .getAllProblems()
+                    .stateIn(
+                            scope = viewModelScope,
+                            started = SharingStarted.WhileSubscribed(),
+                            initialValue = emptyList()
+                    )
+
+    val sessions =
+            repository
+                    .getAllSessions()
+                    .stateIn(
+                            scope = viewModelScope,
+                            started = SharingStarted.WhileSubscribed(),
+                            initialValue = emptyList()
+                    )
+
+    val activeSession =
+            repository
+                    .getActiveSessionFlow()
+                    .stateIn(
+                            scope = viewModelScope,
+                            started = SharingStarted.WhileSubscribed(),
+                            initialValue = null
+                    )
+
+    val attempts =
+            repository
+                    .getAllAttempts()
+                    .stateIn(
+                            scope = viewModelScope,
+                            started = SharingStarted.WhileSubscribed(),
+                            initialValue = emptyList()
+                    )
+
+    // Gym operations
+    fun addGym(gym: Gym) {
+        viewModelScope.launch { repository.insertGym(gym) }
+    }
+
+    fun addGym(gym: Gym, context: Context) {
+        viewModelScope.launch {
+            repository.insertGym(gym)
+            ClimbStatsWidgetProvider.updateAllWidgets(context)
+        }
+    }
+
+    fun updateGym(gym: Gym) {
+        viewModelScope.launch { repository.updateGym(gym) }
+    }
+
+    fun updateGym(gym: Gym, context: Context) {
+        viewModelScope.launch {
+            repository.updateGym(gym)
+            ClimbStatsWidgetProvider.updateAllWidgets(context)
+        }
+    }
+
+    fun deleteGym(gym: Gym) {
+        viewModelScope.launch { repository.deleteGym(gym) }
+    }
+
+    fun deleteGym(gym: Gym, context: Context) {
+        viewModelScope.launch {
+            repository.deleteGym(gym)
+            ClimbStatsWidgetProvider.updateAllWidgets(context)
+        }
+    }
+
+    fun getGymById(id: String): Flow<Gym?> = flow { emit(repository.getGymById(id)) }
+
+    // Problem operations
+    fun addProblem(problem: Problem) {
+        viewModelScope.launch { repository.insertProblem(problem) }
+    }
+
+    fun addProblem(problem: Problem, context: Context) {
+        viewModelScope.launch {
+            repository.insertProblem(problem)
+            ClimbStatsWidgetProvider.updateAllWidgets(context)
+            // Auto-sync now happens automatically via repository callback
+        }
+    }
+
+    fun updateProblem(problem: Problem) {
+        viewModelScope.launch { repository.updateProblem(problem) }
+    }
+
+    fun updateProblem(problem: Problem, context: Context) {
+        viewModelScope.launch {
+            repository.updateProblem(problem)
+            ClimbStatsWidgetProvider.updateAllWidgets(context)
+        }
+    }
+
+    fun deleteProblem(problem: Problem, context: Context) {
+        viewModelScope.launch {
+            // Delete associated images
+            problem.imagePaths.forEach { imagePath -> ImageUtils.deleteImage(context, imagePath) }
+
+            repository.deleteProblem(problem)
+
+            cleanupOrphanedImages(context)
+
+            ClimbStatsWidgetProvider.updateAllWidgets(context)
+        }
+    }
+
+    private suspend fun cleanupOrphanedImages(context: Context) {
+        val allProblems = repository.getAllProblems().first()
+        val referencedImagePaths = allProblems.flatMap { it.imagePaths }.toSet()
+        ImageUtils.cleanupOrphanedImages(context, referencedImagePaths)
+    }
+
+    fun getProblemById(id: String): Flow<Problem?> = flow { emit(repository.getProblemById(id)) }
+
+    fun getProblemsByGym(gymId: String): Flow<List<Problem>> = repository.getProblemsByGym(gymId)
+
+    // Session operations
+    fun addSession(session: ClimbSession) {
+        viewModelScope.launch { repository.insertSession(session) }
+    }
+
+    fun addSession(session: ClimbSession, context: Context) {
+        viewModelScope.launch {
+            repository.insertSession(session)
+            ClimbStatsWidgetProvider.updateAllWidgets(context)
+        }
+    }
+
+    fun updateSession(session: ClimbSession) {
+        viewModelScope.launch { repository.updateSession(session) }
+    }
+
+    fun updateSession(session: ClimbSession, context: Context) {
+        viewModelScope.launch {
+            repository.updateSession(session)
+            ClimbStatsWidgetProvider.updateAllWidgets(context)
+        }
+    }
+
+    fun deleteSession(session: ClimbSession) {
+        viewModelScope.launch { repository.deleteSession(session) }
+    }
+
+    fun deleteSession(session: ClimbSession, context: Context) {
+        viewModelScope.launch {
+            repository.deleteSession(session)
+            ClimbStatsWidgetProvider.updateAllWidgets(context)
+        }
+    }
+
+    fun getSessionById(id: String): Flow<ClimbSession?> = flow {
+        emit(repository.getSessionById(id))
+    }
+
+    fun getSessionsByGym(gymId: String): Flow<List<ClimbSession>> =
+            repository.getSessionsByGym(gymId)
+
+    // Get last used gym for shortcut functionality
+    suspend fun getLastUsedGym(): Gym? = repository.getLastUsedGym()
+
+    // Active session management
+    fun startSession(context: Context, gymId: String, notes: String? = null) {
+        viewModelScope.launch {
+            android.util.Log.d("ClimbViewModel", "startSession called with gymId: $gymId")
+
+            if (!com.atridad.openclimb.utils.NotificationPermissionUtils
+                            .isNotificationPermissionGranted(context)
+            ) {
+                android.util.Log.d("ClimbViewModel", "Notification permission not granted")
+                _uiState.value =
+                        _uiState.value.copy(
+                                error =
+                                        "Notification permission is required to track your climbing session. Please enable notifications in settings."
+                        )
+                return@launch
+            }
+
+            val existingActive = repository.getActiveSession()
+            if (existingActive != null) {
+                android.util.Log.d(
+                        "ClimbViewModel",
+                        "Active session already exists: ${existingActive.id}"
+                )
+                _uiState.value =
+                        _uiState.value.copy(
+                                error = "There's already an active session. Please end it first."
+                        )
+                return@launch
+            }
+
+            android.util.Log.d("ClimbViewModel", "Creating new session")
+            val newSession = ClimbSession.create(gymId = gymId, notes = notes)
+            repository.insertSession(newSession)
+
+            android.util.Log.d(
+                    "ClimbViewModel",
+                    "Starting tracking service for session: ${newSession.id}"
+            )
+            // Start the tracking service
+            val serviceIntent = SessionTrackingService.createStartIntent(context, newSession.id)
+            context.startForegroundService(serviceIntent)
+
+            ClimbStatsWidgetProvider.updateAllWidgets(context)
+
+            android.util.Log.d("ClimbViewModel", "Session started successfully")
+            _uiState.value = _uiState.value.copy(message = "Session started successfully!")
+        }
+    }
+
+    fun endSession(context: Context, sessionId: String) {
+        viewModelScope.launch {
+            if (!com.atridad.openclimb.utils.NotificationPermissionUtils
+                            .isNotificationPermissionGranted(context)
+            ) {
+                _uiState.value =
+                        _uiState.value.copy(
+                                error =
+                                        "Notification permission is required to manage your climbing session. Please enable notifications in settings."
+                        )
+                return@launch
+            }
+
+            val session = repository.getSessionById(sessionId)
+            if (session != null && session.status == SessionStatus.ACTIVE) {
+                val completedSession = with(ClimbSession) { session.complete() }
+                repository.updateSession(completedSession)
+
+                val serviceIntent = SessionTrackingService.createStopIntent(context, sessionId)
+                context.startService(serviceIntent)
+
+                ClimbStatsWidgetProvider.updateAllWidgets(context)
+
+                // Auto-sync now happens automatically via repository callback
+
+                _uiState.value = _uiState.value.copy(message = "Session completed!")
+            }
+        }
+    }
+
+    fun ensureSessionTrackingServiceRunning(context: Context) {
+        viewModelScope.launch {
+            val activeSession = repository.getActiveSession()
+            if (activeSession != null && activeSession.status == SessionStatus.ACTIVE) {
+                val serviceIntent =
+                        SessionTrackingService.createStartIntent(context, activeSession.id)
+                context.startForegroundService(serviceIntent)
+            }
+        }
+    }
+
+    // Attempt operations
+    fun addAttempt(attempt: Attempt) {
+        viewModelScope.launch { repository.insertAttempt(attempt) }
+    }
+
+    fun addAttempt(attempt: Attempt, context: Context) {
+        viewModelScope.launch {
+            repository.insertAttempt(attempt)
+            ClimbStatsWidgetProvider.updateAllWidgets(context)
+            // Auto-sync now happens automatically via repository callback
+        }
+    }
+
+    fun deleteAttempt(attempt: Attempt) {
+        viewModelScope.launch { repository.deleteAttempt(attempt) }
+    }
+
+    fun deleteAttempt(attempt: Attempt, context: Context) {
+        viewModelScope.launch {
+            repository.deleteAttempt(attempt)
+            ClimbStatsWidgetProvider.updateAllWidgets(context)
+        }
+    }
+
+    fun updateAttempt(attempt: Attempt) {
+        viewModelScope.launch { repository.updateAttempt(attempt) }
+    }
+
+    fun updateAttempt(attempt: Attempt, context: Context) {
+        viewModelScope.launch {
+            repository.updateAttempt(attempt)
+            ClimbStatsWidgetProvider.updateAllWidgets(context)
+        }
+    }
+
+    fun getAttemptsBySession(sessionId: String): Flow<List<Attempt>> =
+            repository.getAttemptsBySession(sessionId)
+
+    fun getAttemptsByProblem(problemId: String): Flow<List<Attempt>> =
+            repository.getAttemptsByProblem(problemId)
+
+    fun exportDataToZipUri(context: Context, uri: android.net.Uri) {
+        viewModelScope.launch {
+            try {
+                _uiState.value =
+                        _uiState.value.copy(
+                                isLoading = true,
+                                message = "Creating ZIP file with images..."
+                        )
+                repository.exportAllDataToZipUri(context, uri)
+                _uiState.value =
+                        _uiState.value.copy(
+                                isLoading = false,
+                                message =
+                                        "Export complete! Your climbing data and images have been saved."
+                        )
+            } catch (e: Exception) {
+                _uiState.value =
+                        _uiState.value.copy(
+                                isLoading = false,
+                                error = "Export failed: ${e.message}"
+                        )
+            }
+        }
+    }
+
+    fun importData(file: File) {
+        viewModelScope.launch {
+            try {
+                _uiState.value = _uiState.value.copy(isLoading = true)
+
+                if (!file.name.lowercase().endsWith(".zip")) {
+                    throw Exception(
+                            "Only ZIP files are supported for import. Please use a ZIP file exported from OpenClimb."
+                    )
+                }
+
+                repository.importDataFromZip(file)
+
+                _uiState.value =
+                        _uiState.value.copy(
+                                isLoading = false,
+                                message = "Data imported successfully from ${file.name}"
+                        )
+            } catch (e: Exception) {
+                _uiState.value =
+                        _uiState.value.copy(
+                                isLoading = false,
+                                error = "Import failed: ${e.message}"
+                        )
+            }
+        }
+    }
+
+    // UI state operations
+    fun clearMessage() {
+        _uiState.value = _uiState.value.copy(message = null)
+    }
+
+    fun clearError() {
+        _uiState.value = _uiState.value.copy(error = null)
+    }
+
+    // Sync-related methods
+    suspend fun performManualSync() {
+        try {
+            syncService.syncWithServer()
+        } catch (e: Exception) {
+            setError("Sync failed: ${e.message}")
+        }
+    }
+
+    suspend fun testSyncConnection() {
+        try {
+            syncService.testConnection()
+        } catch (e: Exception) {
+            setError("Connection test failed: ${e.message}")
+        }
+    }
+
+    fun setError(message: String) {
+        _uiState.value = _uiState.value.copy(error = message)
+    }
+
+    fun resetAllData() {
+        viewModelScope.launch {
+            try {
+                _uiState.value = _uiState.value.copy(isLoading = true)
+
+                repository.resetAllData()
+
+                _uiState.value =
+                        _uiState.value.copy(
+                                isLoading = false,
+                                message = "All data has been reset successfully"
+                        )
+            } catch (e: Exception) {
+                _uiState.value =
+                        _uiState.value.copy(isLoading = false, error = "Reset failed: ${e.message}")
+            }
+        }
+    }
+
+    // Share operations
+    suspend fun generateSessionShareCard(context: Context, sessionId: String): File? =
+            withContext(Dispatchers.IO) {
+                try {
+                    val session = repository.getSessionById(sessionId) ?: return@withContext null
+                    val attempts = repository.getAttemptsBySession(sessionId).first()
+                    val problems =
+                            repository.getAllProblems().first().filter { problem ->
+                                attempts.any { it.problemId == problem.id }
+                            }
+                    val gym = repository.getGymById(session.gymId) ?: return@withContext null
+
+                    val stats = SessionShareUtils.calculateSessionStats(session, attempts, problems)
+                    SessionShareUtils.generateShareCard(context, session, gym, stats)
+                } catch (e: Exception) {
+                    _uiState.value =
+                            _uiState.value.copy(
+                                    error = "Failed to generate share card: ${e.message}"
+                            )
+                    null
+                }
+            }
+
+    fun shareSessionCard(context: Context, imageFile: File) {
+        SessionShareUtils.shareSessionCard(context, imageFile)
+    }
+}
+
+data class ClimbUiState(
+        val isLoading: Boolean = false,
+        val message: String? = null,
+        val error: String? = null
+)

android/app/src/main/java/com/atridad/openclimb/ui/viewmodel/ClimbViewModelFactory.kt

@@ -0,0 +1,20 @@
+package com.atridad.openclimb.ui.viewmodel
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import com.atridad.openclimb.data.repository.ClimbRepository
+import com.atridad.openclimb.data.sync.SyncService
+
+class ClimbViewModelFactory(
+        private val repository: ClimbRepository,
+        private val syncService: SyncService
+) : ViewModelProvider.Factory {
+
+    @Suppress("UNCHECKED_CAST")
+    override fun <T : ViewModel> create(modelClass: Class<T>): T {
+        if (modelClass.isAssignableFrom(ClimbViewModel::class.java)) {
+            return ClimbViewModel(repository, syncService) as T
+        }
+        throw IllegalArgumentException("Unknown ViewModel class")
+    }
+}

android/app/src/main/java/com/atridad/openclimb/utils/DateFormatUtils.kt

@@ -0,0 +1,46 @@
+package com.atridad.openclimb.utils
+
+import java.time.Instant
+import java.time.ZoneOffset
+import java.time.format.DateTimeFormatter
+
+object DateFormatUtils {
+
+    // ISO 8601 formatter matching iOS date format exactly
+    private val ISO_FORMATTER =
+            DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSX").withZone(ZoneOffset.UTC)
+
+    /** Get current timestamp in iOS-compatible ISO 8601 format */
+    fun nowISO8601(): String {
+        return ISO_FORMATTER.format(Instant.now())
+    }
+
+    /** Format an Instant to iOS-compatible ISO 8601 format */
+    fun formatISO8601(instant: Instant): String {
+        return ISO_FORMATTER.format(instant)
+    }
+
+    /** Parse an iOS-compatible ISO 8601 date string back to Instant */
+    fun parseISO8601(dateString: String): Instant? {
+        return try {
+            Instant.from(ISO_FORMATTER.parse(dateString))
+        } catch (e: Exception) {
+
+            try {
+                Instant.parse(dateString)
+            } catch (e2: Exception) {
+                null
+            }
+        }
+    }
+
+    /** Validate that a date string matches the expected iOS format */
+    fun isValidISO8601(dateString: String): Boolean {
+        return parseISO8601(dateString) != null
+    }
+
+    /** Convert milliseconds timestamp to iOS-compatible ISO 8601 format */
+    fun millisToISO8601(millis: Long): String {
+        return ISO_FORMATTER.format(Instant.ofEpochMilli(millis))
+    }
+}

android/app/src/main/java/com/atridad/openclimb/utils/ImageNamingUtils.kt

@@ -0,0 +1,101 @@
+package com.atridad.openclimb.utils
+
+import java.security.MessageDigest
+import java.util.*
+
+/**
+ * Utility for creating consistent image filenames across iOS and Android platforms. Uses
+ * deterministic naming based on problem ID and timestamp to ensure sync compatibility.
+ */
+object ImageNamingUtils {
+
+    private const val IMAGE_EXTENSION = ".jpg"
+    private const val HASH_LENGTH = 12 // First 12 chars of SHA-256
+
+    /** Generates a deterministic filename for a problem image */
+    fun generateImageFilename(problemId: String, timestamp: String, imageIndex: Int): String {
+        // Create a deterministic hash from problemId + timestamp + index
+        val input = "${problemId}_${timestamp}_${imageIndex}"
+        val hash = createHash(input)
+
+        return "problem_${hash}_${imageIndex}${IMAGE_EXTENSION}"
+    }
+
+    /** Generates a deterministic filename using current timestamp */
+    fun generateImageFilename(problemId: String, imageIndex: Int): String {
+        val timestamp = DateFormatUtils.nowISO8601()
+        return generateImageFilename(problemId, timestamp, imageIndex)
+    }
+
+    /** Extracts problem ID from an image filename */
+    fun extractProblemIdFromFilename(filename: String): String? {
+        if (!filename.startsWith("problem_") || !filename.endsWith(IMAGE_EXTENSION)) {
+            return null
+        }
+
+        // Format: problem_{hash}_{index}.jpg
+        val nameWithoutExtension = filename.substring(0, filename.length - IMAGE_EXTENSION.length)
+        val parts = nameWithoutExtension.split("_")
+
+        if (parts.size != 3 || parts[0] != "problem") {
+            return null
+        }
+
+        // We can't extract the original problem ID from the hash,
+        // but we can validate the format
+        return parts[1] // Return the hash as identifier
+    }
+
+    /** Validates if a filename follows our naming convention */
+    fun isValidImageFilename(filename: String): Boolean {
+        if (!filename.startsWith("problem_") || !filename.endsWith(IMAGE_EXTENSION)) {
+            return false
+        }
+
+        val nameWithoutExtension = filename.substring(0, filename.length - IMAGE_EXTENSION.length)
+        val parts = nameWithoutExtension.split("_")
+
+        return parts.size == 3 &&
+                parts[0] == "problem" &&
+                parts[1].length == HASH_LENGTH &&
+                parts[2].toIntOrNull() != null
+    }
+
+    /** Migrates an existing filename to our naming convention */
+    fun migrateFilename(oldFilename: String, problemId: String, imageIndex: Int): String {
+        // If it's already using our convention, keep it
+        if (isValidImageFilename(oldFilename)) {
+            return oldFilename
+        }
+
+        // Generate new deterministic name
+        // Use a timestamp based on the old filename to maintain some consistency
+        val timestamp = DateFormatUtils.nowISO8601()
+        return generateImageFilename(problemId, timestamp, imageIndex)
+    }
+
+    /** Creates a deterministic hash from input string */
+    private fun createHash(input: String): String {
+        val digest = MessageDigest.getInstance("SHA-256")
+        val hashBytes = digest.digest(input.toByteArray(Charsets.UTF_8))
+        val hashHex = hashBytes.joinToString("") { "%02x".format(it) }
+        return hashHex.take(HASH_LENGTH)
+    }
+
+    /** Batch renames images for a problem to use our naming convention */
+    fun batchRenameForProblem(
+            problemId: String,
+            existingFilenames: List<String>
+    ): Map<String, String> {
+        val renameMap = mutableMapOf<String, String>()
+
+        existingFilenames.forEachIndexed { index, oldFilename ->
+            val newFilename = migrateFilename(oldFilename, problemId, index)
+            if (newFilename != oldFilename) {
+                renameMap[oldFilename] = newFilename
+            }
+        }
+
+        return renameMap
+    }
+}

android/app/src/main/java/com/atridad/openclimb/utils/ImageUtils.kt

@@ -0,0 +1,331 @@
+package com.atridad.openclimb.utils
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import android.net.Uri
+import androidx.core.graphics.scale
+import java.io.File
+import java.io.FileOutputStream
+import java.util.UUID
+
+object ImageUtils {
+
+    private const val IMAGES_DIR = "problem_images"
+    private const val MAX_IMAGE_SIZE = 1024
+    private const val IMAGE_QUALITY = 85
+
+    // Creates the images directory if it doesn't exist
+    private fun getImagesDirectory(context: Context): File {
+        val imagesDir = File(context.filesDir, IMAGES_DIR)
+        if (!imagesDir.exists()) {
+            imagesDir.mkdirs()
+        }
+        return imagesDir
+    }
+
+    /** Saves an image from a URI with compression and proper orientation */
+    fun saveImageFromUri(
+            context: Context,
+            imageUri: Uri,
+            problemId: String? = null,
+            imageIndex: Int? = null
+    ): String? {
+        return try {
+
+            val originalBitmap =
+                    context.contentResolver.openInputStream(imageUri)?.use { input ->
+                        BitmapFactory.decodeStream(input)
+                    }
+                            ?: return null
+
+            val orientedBitmap = correctImageOrientation(context, imageUri, originalBitmap)
+            val compressedBitmap = compressImage(orientedBitmap)
+
+            val filename =
+                    if (problemId != null && imageIndex != null) {
+                        ImageNamingUtils.generateImageFilename(problemId, imageIndex)
+                    } else {
+                        "${UUID.randomUUID()}.jpg"
+                    }
+            val imageFile = File(getImagesDirectory(context), filename)
+
+            FileOutputStream(imageFile).use { output ->
+                compressedBitmap.compress(Bitmap.CompressFormat.JPEG, IMAGE_QUALITY, output)
+            }
+
+            originalBitmap.recycle()
+            if (orientedBitmap != originalBitmap) {
+                orientedBitmap.recycle()
+            }
+            compressedBitmap.recycle()
+
+            "$IMAGES_DIR/$filename"
+        } catch (e: Exception) {
+            e.printStackTrace()
+            null
+        }
+    }
+
+    /** Corrects image orientation based on EXIF data */
+    private fun correctImageOrientation(context: Context, imageUri: Uri, bitmap: Bitmap): Bitmap {
+        return try {
+            val inputStream = context.contentResolver.openInputStream(imageUri)
+            inputStream?.use { input ->
+                val exif = android.media.ExifInterface(input)
+                val orientation =
+                        exif.getAttributeInt(
+                                android.media.ExifInterface.TAG_ORIENTATION,
+                                android.media.ExifInterface.ORIENTATION_NORMAL
+                        )
+
+                val matrix = android.graphics.Matrix()
+                when (orientation) {
+                    android.media.ExifInterface.ORIENTATION_ROTATE_90 -> {
+                        matrix.postRotate(90f)
+                    }
+                    android.media.ExifInterface.ORIENTATION_ROTATE_180 -> {
+                        matrix.postRotate(180f)
+                    }
+                    android.media.ExifInterface.ORIENTATION_ROTATE_270 -> {
+                        matrix.postRotate(270f)
+                    }
+                    android.media.ExifInterface.ORIENTATION_FLIP_HORIZONTAL -> {
+                        matrix.postScale(-1f, 1f)
+                    }
+                    android.media.ExifInterface.ORIENTATION_FLIP_VERTICAL -> {
+                        matrix.postScale(1f, -1f)
+                    }
+                    android.media.ExifInterface.ORIENTATION_TRANSPOSE -> {
+                        matrix.postRotate(90f)
+                        matrix.postScale(-1f, 1f)
+                    }
+                    android.media.ExifInterface.ORIENTATION_TRANSVERSE -> {
+                        matrix.postRotate(-90f)
+                        matrix.postScale(-1f, 1f)
+                    }
+                }
+
+                if (matrix.isIdentity) {
+                    bitmap
+                } else {
+                    android.graphics.Bitmap.createBitmap(
+                            bitmap,
+                            0,
+                            0,
+                            bitmap.width,
+                            bitmap.height,
+                            matrix,
+                            true
+                    )
+                }
+            }
+                    ?: bitmap
+        } catch (e: Exception) {
+            e.printStackTrace()
+            bitmap
+        }
+    }
+
+    /** Compresses and resizes an image bitmap */
+    @SuppressLint("UseKtx")
+    private fun compressImage(original: Bitmap): Bitmap {
+        val width = original.width
+        val height = original.height
+
+        // Calculate the scaling factor
+        val scaleFactor =
+                if (width > height) {
+                    if (width > MAX_IMAGE_SIZE) MAX_IMAGE_SIZE.toFloat() / width else 1f
+                } else {
+                    if (height > MAX_IMAGE_SIZE) MAX_IMAGE_SIZE.toFloat() / height else 1f
+                }
+
+        return if (scaleFactor < 1f) {
+            val newWidth = (width * scaleFactor).toInt()
+            val newHeight = (height * scaleFactor).toInt()
+            original.scale(newWidth, newHeight)
+        } else {
+            original
+        }
+    }
+
+    /** Gets the full file path for an image */
+    fun getImageFile(context: Context, relativePath: String): File {
+        // If relativePath already contains the directory, use it as-is
+        // Otherwise, assume it's just a filename and add the images directory
+        return if (relativePath.contains("/")) {
+            File(context.filesDir, relativePath)
+        } else {
+            // Just a filename - look in the images directory
+            File(getImagesDirectory(context), relativePath)
+        }
+    }
+
+    /** Deletes an image file */
+    fun deleteImage(context: Context, relativePath: String): Boolean {
+        return try {
+            val file = getImageFile(context, relativePath)
+            file.delete()
+        } catch (e: Exception) {
+            e.printStackTrace()
+            false
+        }
+    }
+
+    /** Imports an image file from the import directory */
+    fun importImageFile(context: Context, sourceFile: File): String? {
+        return try {
+            if (!sourceFile.exists()) return null
+
+            // Generate new filename to avoid conflicts
+            val extension = sourceFile.extension.ifEmpty { "jpg" }
+            val filename = "${UUID.randomUUID()}.$extension"
+            val destFile = File(getImagesDirectory(context), filename)
+
+            sourceFile.copyTo(destFile, overwrite = true)
+            "$IMAGES_DIR/$filename"
+        } catch (e: Exception) {
+            e.printStackTrace()
+            null
+        }
+    }
+
+    /** Gets all image files in the images directory */
+    fun getAllImages(context: Context): List<String> {
+        return try {
+            val imagesDir = getImagesDirectory(context)
+            imagesDir.listFiles()?.mapNotNull { file ->
+                if (file.isFile &&
+                                (file.extension == "jpg" ||
+                                        file.extension == "jpeg" ||
+                                        file.extension == "png")
+                ) {
+                    "$IMAGES_DIR/${file.name}"
+                } else null
+            }
+                    ?: emptyList()
+        } catch (e: Exception) {
+            e.printStackTrace()
+            emptyList()
+        }
+    }
+
+    /** Saves an image from byte array to app's private storage */
+    fun saveImageFromBytes(context: Context, imageData: ByteArray): String? {
+        return try {
+            val bitmap = BitmapFactory.decodeByteArray(imageData, 0, imageData.size) ?: return null
+
+            val compressedBitmap = compressImage(bitmap)
+
+            // Generate unique filename
+            val filename = "${UUID.randomUUID()}.jpg"
+            val imageFile = File(getImagesDirectory(context), filename)
+
+            // Save compressed image
+            FileOutputStream(imageFile).use { output ->
+                compressedBitmap.compress(Bitmap.CompressFormat.JPEG, IMAGE_QUALITY, output)
+            }
+
+            // Clean up bitmaps
+            bitmap.recycle()
+            compressedBitmap.recycle()
+
+            // Return relative path
+            "$IMAGES_DIR/$filename"
+        } catch (e: Exception) {
+            e.printStackTrace()
+            null
+        }
+    }
+
+    /** Saves image data with a specific filename */
+    fun saveImageFromBytesWithFilename(
+            context: Context,
+            imageData: ByteArray,
+            filename: String
+    ): String? {
+        return try {
+            val bitmap = BitmapFactory.decodeByteArray(imageData, 0, imageData.size) ?: return null
+
+            val compressedBitmap = compressImage(bitmap)
+
+            // Use the provided filename instead of generating a new UUID
+            val imageFile = File(getImagesDirectory(context), filename)
+
+            // Save compressed image
+            FileOutputStream(imageFile).use { output ->
+                compressedBitmap.compress(Bitmap.CompressFormat.JPEG, IMAGE_QUALITY, output)
+            }
+
+            // Clean up bitmaps
+            bitmap.recycle()
+            compressedBitmap.recycle()
+
+            // Return relative path
+            "$IMAGES_DIR/$filename"
+        } catch (e: Exception) {
+            e.printStackTrace()
+            null
+        }
+    }
+
+    /** Migrates existing images to use consistent naming convention */
+    fun migrateImageNaming(
+            context: Context,
+            problemId: String,
+            currentImagePaths: List<String>
+    ): Map<String, String> {
+        val migrationMap = mutableMapOf<String, String>()
+
+        currentImagePaths.forEachIndexed { index, oldPath ->
+            val oldFilename = oldPath.substringAfterLast('/')
+            val newFilename = ImageNamingUtils.migrateFilename(oldFilename, problemId, index)
+
+            if (oldFilename != newFilename) {
+                try {
+                    val oldFile = getImageFile(context, oldPath)
+                    val newFile = File(getImagesDirectory(context), newFilename)
+
+                    if (oldFile.exists() && oldFile.renameTo(newFile)) {
+                        val newPath = "$IMAGES_DIR/$newFilename"
+                        migrationMap[oldPath] = newPath
+                    }
+                } catch (e: Exception) {
+                    // Log error but continue with other images
+                    e.printStackTrace()
+                }
+            }
+        }
+
+        return migrationMap
+    }
+
+    /** Batch migrates all images in the system to use consistent naming */
+    fun batchMigrateAllImages(
+            context: Context,
+            problemImageMap: Map<String, List<String>>
+    ): Map<String, String> {
+        val allMigrations = mutableMapOf<String, String>()
+
+        problemImageMap.forEach { (problemId, imagePaths) ->
+            val migrations = migrateImageNaming(context, problemId, imagePaths)
+            allMigrations.putAll(migrations)
+        }
+
+        return allMigrations
+    }
+
+    /** Cleans up orphaned images that are not referenced by any problems */
+    fun cleanupOrphanedImages(context: Context, referencedPaths: Set<String>) {
+        try {
+            val allImages = getAllImages(context)
+            val orphanedImages = allImages.filter { it !in referencedPaths }
+
+            orphanedImages.forEach { path -> deleteImage(context, path) }
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/utils/NotificationPermissionUtils.kt

@@ -0,0 +1,33 @@
+package com.atridad.openclimb.utils
+
+import android.Manifest
+import android.content.Context
+import android.content.pm.PackageManager
+import androidx.core.content.ContextCompat
+
+object NotificationPermissionUtils {
+    
+    /**
+     * Check if notification permission is granted
+     */
+    fun isNotificationPermissionGranted(context: Context): Boolean {
+        return ContextCompat.checkSelfPermission(
+            context,
+            Manifest.permission.POST_NOTIFICATIONS
+        ) == PackageManager.PERMISSION_GRANTED
+    }
+    
+    /**
+     * Check if notification permission should be requested
+     */
+    fun shouldRequestNotificationPermission(): Boolean {
+        return true
+    }
+    
+    /**
+     * Get the notification permission string
+     */
+    fun getNotificationPermissionString(): String {
+        return Manifest.permission.POST_NOTIFICATIONS
+    }
+}

android/app/src/main/java/com/atridad/openclimb/utils/SessionShareUtils.kt

@@ -0,0 +1,543 @@
+package com.atridad.openclimb.utils
+
+import android.content.Context
+import android.content.Intent
+import android.graphics.*
+import android.graphics.drawable.GradientDrawable
+import androidx.core.content.FileProvider
+import androidx.core.graphics.createBitmap
+import androidx.core.graphics.toColorInt
+import com.atridad.openclimb.data.model.*
+import java.io.File
+import java.io.FileOutputStream
+import java.time.LocalDateTime
+import java.time.format.DateTimeFormatter
+import kotlin.math.roundToInt
+
+object SessionShareUtils {
+
+    data class SessionStats(
+            val totalAttempts: Int,
+            val successfulAttempts: Int,
+            val problems: List<Problem>,
+            val uniqueProblemsAttempted: Int,
+            val uniqueProblemsCompleted: Int,
+            val averageGrade: String?,
+            val sessionDuration: String,
+            val topResult: AttemptResult?,
+            val topGrade: String?
+    )
+
+    fun calculateSessionStats(
+            session: ClimbSession,
+            attempts: List<Attempt>,
+            problems: List<Problem>
+    ): SessionStats {
+        val successfulResults = listOf(AttemptResult.SUCCESS, AttemptResult.FLASH)
+
+        val successfulAttempts = attempts.filter { it.result in successfulResults }
+        val uniqueProblems = attempts.map { it.problemId }.distinct()
+        val uniqueCompletedProblems = successfulAttempts.map { it.problemId }.distinct()
+
+        val attemptedProblems = problems.filter { it.id in uniqueProblems }
+
+        // Calculate separate averages for different climbing types and difficulty systems
+        val boulderProblems = attemptedProblems.filter { it.climbType == ClimbType.BOULDER }
+        val ropeProblems = attemptedProblems.filter { it.climbType == ClimbType.ROPE }
+
+        val boulderAverage = calculateAverageGrade(boulderProblems, "Boulder")
+        val ropeAverage = calculateAverageGrade(ropeProblems, "Rope")
+
+        // Combine averages for display
+        val averageGrade =
+                when {
+                    boulderAverage != null && ropeAverage != null ->
+                            "$boulderAverage / $ropeAverage"
+                    boulderAverage != null -> boulderAverage
+                    ropeAverage != null -> ropeAverage
+                    else -> null
+                }
+
+        // Determine highest achieved grade (only from completed problems: SUCCESS or FLASH)
+        val completedProblems = problems.filter { it.id in uniqueCompletedProblems }
+        val completedBoulder = completedProblems.filter { it.climbType == ClimbType.BOULDER }
+        val completedRope = completedProblems.filter { it.climbType == ClimbType.ROPE }
+        val topBoulder = highestGradeForProblems(completedBoulder)
+        val topRope = highestGradeForProblems(completedRope)
+        val topGrade =
+                when {
+                    topBoulder != null && topRope != null -> "$topBoulder / $topRope"
+                    topBoulder != null -> topBoulder
+                    topRope != null -> topRope
+                    else -> null
+                }
+
+        val duration = if (session.duration != null) "${session.duration}m" else "Unknown"
+        val topResult =
+                attempts
+                        .maxByOrNull {
+                            when (it.result) {
+                                AttemptResult.FLASH -> 3
+                                AttemptResult.SUCCESS -> 2
+                                AttemptResult.FALL -> 1
+                                else -> 0
+                            }
+                        }
+                        ?.result
+
+        return SessionStats(
+                totalAttempts = attempts.size,
+                successfulAttempts = successfulAttempts.size,
+                problems = attemptedProblems,
+                uniqueProblemsAttempted = uniqueProblems.size,
+                uniqueProblemsCompleted = uniqueCompletedProblems.size,
+                averageGrade = averageGrade,
+                sessionDuration = duration,
+                topResult = topResult,
+                topGrade = topGrade
+        )
+    }
+
+    /**
+     * Calculate average grade for a specific set of problems, respecting their difficulty systems
+     */
+    private fun calculateAverageGrade(problems: List<Problem>, climbingType: String): String? {
+        if (problems.isEmpty()) return null
+
+        // Group problems by difficulty system
+        val problemsBySystem = problems.groupBy { it.difficulty.system }
+
+        val averages = mutableListOf<String>()
+
+        problemsBySystem.forEach { (system, systemProblems) ->
+            when (system) {
+                DifficultySystem.V_SCALE -> {
+                    val gradeValues =
+                            systemProblems.mapNotNull { problem ->
+                                when {
+                                    problem.difficulty.grade == "VB" -> 0
+                                    else -> problem.difficulty.grade.removePrefix("V").toIntOrNull()
+                                }
+                            }
+                    if (gradeValues.isNotEmpty()) {
+                        val avg = gradeValues.average().roundToInt()
+                        averages.add(if (avg == 0) "VB" else "V$avg")
+                    }
+                }
+                DifficultySystem.FONT -> {
+                    val gradeValues =
+                            systemProblems.mapNotNull { problem ->
+                                // Extract numeric part from Font grades (e.g., "6A" -> 6, "7C+" ->
+                                // 7)
+                                problem.difficulty.grade.filter { it.isDigit() }.toIntOrNull()
+                            }
+                    if (gradeValues.isNotEmpty()) {
+                        val avg = gradeValues.average().roundToInt()
+                        averages.add("$avg")
+                    }
+                }
+                DifficultySystem.YDS -> {
+                    val gradeValues =
+                            systemProblems.mapNotNull { problem ->
+                                // Extract numeric part from YDS grades (e.g., "5.10a" -> 5.10)
+                                val grade = problem.difficulty.grade
+                                if (grade.startsWith("5.")) {
+                                    grade.substring(2).toDoubleOrNull()
+                                } else null
+                            }
+                    if (gradeValues.isNotEmpty()) {
+                        val avg = gradeValues.average()
+                        averages.add("5.${String.format("%.1f", avg)}")
+                    }
+                }
+                DifficultySystem.CUSTOM -> {
+                    // For custom systems, try to extract numeric values
+                    val gradeValues =
+                            systemProblems.mapNotNull { problem ->
+                                problem.difficulty
+                                        .grade
+                                        .filter { it.isDigit() || it == '.' || it == '-' }
+                                        .toDoubleOrNull()
+                            }
+                    if (gradeValues.isNotEmpty()) {
+                        val avg = gradeValues.average()
+                        averages.add(String.format("%.1f", avg))
+                    }
+                }
+            }
+        }
+
+        return if (averages.isNotEmpty()) {
+            if (averages.size == 1) {
+                averages.first()
+            } else {
+                averages.joinToString(" / ")
+            }
+        } else null
+    }
+
+    fun generateShareCard(
+            context: Context,
+            session: ClimbSession,
+            gym: Gym,
+            stats: SessionStats
+    ): File? {
+        return try {
+            val width = 1242 // 3:4 aspect at higher resolution for better fit
+            val height = 1656
+
+            val bitmap = createBitmap(width, height)
+            val canvas = Canvas(bitmap)
+
+            val gradientDrawable =
+                    GradientDrawable(
+                            GradientDrawable.Orientation.TOP_BOTTOM,
+                            intArrayOf("#667eea".toColorInt(), "#764ba2".toColorInt())
+                    )
+            gradientDrawable.setBounds(0, 0, width, height)
+            gradientDrawable.draw(canvas)
+
+            // Setup paint objects
+            val titlePaint =
+                    Paint().apply {
+                        color = Color.WHITE
+                        textSize = 72f
+                        typeface = Typeface.DEFAULT_BOLD
+                        isAntiAlias = true
+                        textAlign = Paint.Align.CENTER
+                    }
+
+            val subtitlePaint =
+                    Paint().apply {
+                        color = "#E8E8E8".toColorInt()
+                        textSize = 48f
+                        typeface = Typeface.DEFAULT
+                        isAntiAlias = true
+                        textAlign = Paint.Align.CENTER
+                    }
+
+            val statLabelPaint =
+                    Paint().apply {
+                        color = "#B8B8B8".toColorInt()
+                        textSize = 36f
+                        typeface = Typeface.DEFAULT
+                        isAntiAlias = true
+                        textAlign = Paint.Align.CENTER
+                    }
+
+            val statValuePaint =
+                    Paint().apply {
+                        color = Color.WHITE
+                        textSize = 64f
+                        typeface = Typeface.DEFAULT_BOLD
+                        isAntiAlias = true
+                        textAlign = Paint.Align.CENTER
+                    }
+
+            val cardPaint =
+                    Paint().apply {
+                        color = "#40FFFFFF".toColorInt()
+                        isAntiAlias = true
+                    }
+
+            // Draw main card background
+            val cardRect = RectF(60f, 200f, width - 60f, height - 120f)
+            canvas.drawRoundRect(cardRect, 40f, 40f, cardPaint)
+
+            // Draw content
+            var yPosition = 300f
+
+            // Title
+            canvas.drawText("Climbing Session", width / 2f, yPosition, titlePaint)
+            yPosition += 80f
+
+            // Gym and date
+            canvas.drawText(gym.name, width / 2f, yPosition, subtitlePaint)
+            yPosition += 60f
+
+            val dateText = formatSessionDate(session.date)
+            canvas.drawText(dateText, width / 2f, yPosition, subtitlePaint)
+            yPosition += 120f
+
+            // Stats grid
+            val statsStartY = yPosition
+            val columnWidth = width / 2f
+            val columnMaxTextWidth = columnWidth - 120f
+
+            // Left column stats
+            var leftY = statsStartY
+            drawStatItemFitting(
+                    canvas,
+                    columnWidth / 2f,
+                    leftY,
+                    "Attempts",
+                    stats.totalAttempts.toString(),
+                    statLabelPaint,
+                    statValuePaint,
+                    columnMaxTextWidth
+            )
+            leftY += 120f
+            drawStatItemFitting(
+                    canvas,
+                    columnWidth / 2f,
+                    leftY,
+                    "Problems",
+                    stats.uniqueProblemsAttempted.toString(),
+                    statLabelPaint,
+                    statValuePaint,
+                    columnMaxTextWidth
+            )
+            leftY += 120f
+            drawStatItemFitting(
+                    canvas,
+                    columnWidth / 2f,
+                    leftY,
+                    "Duration",
+                    stats.sessionDuration,
+                    statLabelPaint,
+                    statValuePaint,
+                    columnMaxTextWidth
+            )
+
+            // Right column stats
+            var rightY = statsStartY
+            drawStatItemFitting(
+                    canvas,
+                    width - columnWidth / 2f,
+                    rightY,
+                    "Completed",
+                    stats.uniqueProblemsCompleted.toString(),
+                    statLabelPaint,
+                    statValuePaint,
+                    columnMaxTextWidth
+            )
+            rightY += 120f
+
+            var rightYAfter = rightY
+            stats.topGrade?.let { grade ->
+                drawStatItemFitting(
+                        canvas,
+                        width - columnWidth / 2f,
+                        rightY,
+                        "Top Grade",
+                        grade,
+                        statLabelPaint,
+                        statValuePaint,
+                        columnMaxTextWidth
+                )
+                rightYAfter += 120f
+            }
+
+            // Grade range(s)
+            val boulderRange =
+                    gradeRangeForProblems(
+                            stats.problems.filter { it.climbType == ClimbType.BOULDER }
+                    )
+            val ropeRange =
+                    gradeRangeForProblems(stats.problems.filter { it.climbType == ClimbType.ROPE })
+            val rangesY = kotlin.math.max(leftY, rightYAfter) + 120f
+            if (boulderRange != null && ropeRange != null) {
+                // Two evenly spaced items
+                drawStatItemFitting(
+                        canvas,
+                        columnWidth / 2f,
+                        rangesY,
+                        "Boulder Range",
+                        boulderRange,
+                        statLabelPaint,
+                        statValuePaint,
+                        columnMaxTextWidth
+                )
+                drawStatItemFitting(
+                        canvas,
+                        width - columnWidth / 2f,
+                        rangesY,
+                        "Rope Range",
+                        ropeRange,
+                        statLabelPaint,
+                        statValuePaint,
+                        columnMaxTextWidth
+                )
+            } else if (boulderRange != null || ropeRange != null) {
+                // Single centered item
+                val singleRange = boulderRange ?: ropeRange ?: ""
+                drawStatItemFitting(
+                        canvas,
+                        width / 2f,
+                        rangesY,
+                        "Grade Range",
+                        singleRange,
+                        statLabelPaint,
+                        statValuePaint,
+                        width - 200f
+                )
+            }
+
+            // App branding
+            val brandingPaint =
+                    Paint().apply {
+                        color = "#80FFFFFF".toColorInt()
+                        textSize = 32f
+                        typeface = Typeface.DEFAULT
+                        isAntiAlias = true
+                        textAlign = Paint.Align.CENTER
+                    }
+            canvas.drawText("OpenClimb", width / 2f, height - 40f, brandingPaint)
+
+            // Save to file
+            val shareDir = File(context.cacheDir, "shares")
+            if (!shareDir.exists()) {
+                shareDir.mkdirs()
+            }
+
+            val filename = "session_${session.id}_${System.currentTimeMillis()}.png"
+            val file = File(shareDir, filename)
+
+            val outputStream = FileOutputStream(file)
+            bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream)
+            outputStream.flush()
+            outputStream.close()
+
+            bitmap.recycle()
+
+            file
+        } catch (e: Exception) {
+            e.printStackTrace()
+            null
+        }
+    }
+
+    private fun drawStatItem(
+            canvas: Canvas,
+            x: Float,
+            y: Float,
+            label: String,
+            value: String,
+            labelPaint: Paint,
+            valuePaint: Paint
+    ) {
+        canvas.drawText(value, x, y, valuePaint)
+        canvas.drawText(label, x, y + 50f, labelPaint)
+    }
+
+    /**
+     * Draws a stat item while fitting the value text to a max width by reducing text size if
+     * needed.
+     */
+    private fun drawStatItemFitting(
+            canvas: Canvas,
+            x: Float,
+            y: Float,
+            label: String,
+            value: String,
+            labelPaint: Paint,
+            valuePaint: Paint,
+            maxTextWidth: Float
+    ) {
+        val tempPaint = Paint(valuePaint)
+        var textSize = tempPaint.textSize
+        var textWidth = tempPaint.measureText(value)
+        while (textWidth > maxTextWidth && textSize > 36f) {
+            textSize -= 2f
+            tempPaint.textSize = textSize
+            textWidth = tempPaint.measureText(value)
+        }
+        canvas.drawText(value, x, y, tempPaint)
+        canvas.drawText(label, x, y + 50f, labelPaint)
+    }
+
+    /**
+     * Returns a range string like "X - Y" for the given problems, based on their difficulty grades.
+     */
+    private fun gradeRangeForProblems(problems: List<Problem>): String? {
+        if (problems.isEmpty()) return null
+        val grades = problems.map { it.difficulty }
+        val sorted = grades.sortedWith { a, b -> a.compareTo(b) }
+        return "${sorted.first().grade} - ${sorted.last().grade}"
+    }
+
+    private fun formatSessionDate(dateString: String): String {
+        return try {
+            val formatter = DateTimeFormatter.ISO_LOCAL_DATE_TIME
+            val date = LocalDateTime.parse(dateString, formatter)
+            val displayFormatter = DateTimeFormatter.ofPattern("MMMM dd, yyyy")
+            date.format(displayFormatter)
+        } catch (_: Exception) {
+            dateString.take(10)
+        }
+    }
+
+    fun shareSessionCard(context: Context, imageFile: File) {
+        try {
+            val uri =
+                    FileProvider.getUriForFile(
+                            context,
+                            "${context.packageName}.fileprovider",
+                            imageFile
+                    )
+
+            val shareIntent =
+                    Intent().apply {
+                        action = Intent.ACTION_SEND
+                        type = "image/png"
+                        putExtra(Intent.EXTRA_STREAM, uri)
+                        putExtra(Intent.EXTRA_TEXT, "Check out my climbing session! #OpenClimb")
+                        addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+                    }
+
+            val chooser = Intent.createChooser(shareIntent, "Share Session")
+            chooser.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            context.startActivity(chooser)
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+    }
+
+    /**
+     * Returns the highest grade string among the given problems, respecting their difficulty
+     * system.
+     */
+    private fun highestGradeForProblems(problems: List<Problem>): String? {
+        if (problems.isEmpty()) return null
+        return problems
+                .maxByOrNull { p -> gradeRank(p.difficulty.system, p.difficulty.grade) }
+                ?.difficulty
+                ?.grade
+    }
+
+    /** Produces a comparable numeric rank for grades across supported systems. */
+    private fun gradeRank(system: DifficultySystem, grade: String): Double {
+        return when (system) {
+            DifficultySystem.V_SCALE -> {
+                if (grade == "VB") 0.0 else grade.removePrefix("V").toDoubleOrNull() ?: -1.0
+            }
+            DifficultySystem.FONT -> {
+                val list = DifficultySystem.FONT.getAvailableGrades()
+                val idx = list.indexOf(grade.uppercase())
+                if (idx >= 0) idx.toDouble()
+                else grade.filter { it.isDigit() }.toDoubleOrNull() ?: -1.0
+            }
+            DifficultySystem.YDS -> {
+                // Parse 5.X with optional letter a-d
+                val s = grade.lowercase()
+                if (!s.startsWith("5.")) return -1.0
+                val tail = s.removePrefix("5.")
+                val numberPart = tail.takeWhile { it.isDigit() || it == '.' }
+                val letterPart = tail.drop(numberPart.length).firstOrNull()
+                val base = numberPart.toDoubleOrNull() ?: return -1.0
+                val letterWeight =
+                        when (letterPart) {
+                            'a' -> 0.0
+                            'b' -> 0.1
+                            'c' -> 0.2
+                            'd' -> 0.3
+                            else -> 0.0
+                        }
+                base + letterWeight
+            }
+            DifficultySystem.CUSTOM -> {
+                grade.filter { it.isDigit() || it == '.' || it == '-' }.toDoubleOrNull() ?: -1.0
+            }
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/utils/ShortcutManager.kt

@@ -0,0 +1,110 @@
+package com.atridad.openclimb.utils
+
+import android.content.Context
+import android.content.Intent
+import android.content.pm.ShortcutInfo
+import android.content.pm.ShortcutManager
+import android.graphics.drawable.Icon
+import android.os.Build
+import androidx.annotation.RequiresApi
+import com.atridad.openclimb.MainActivity
+import com.atridad.openclimb.R
+
+object AppShortcutManager {
+
+    const val SHORTCUT_START_SESSION = "start_session"
+    const val SHORTCUT_END_SESSION = "end_session"
+
+    const val ACTION_START_SESSION = "com.atridad.openclimb.action.START_SESSION"
+    const val ACTION_END_SESSION = "com.atridad.openclimb.action.END_SESSION"
+
+    /** Updates the app shortcuts based on current session state */
+    fun updateShortcuts(
+            context: Context,
+            hasActiveSession: Boolean,
+            hasGyms: Boolean,
+            lastUsedGym: com.atridad.openclimb.data.model.Gym? = null
+    ) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1) {
+            val shortcutManager = context.getSystemService(ShortcutManager::class.java)
+
+            val shortcuts = mutableListOf<ShortcutInfo>()
+
+            if (hasActiveSession) {
+                // Show "End Session" shortcut when there's an active session
+                shortcuts.add(createEndSessionShortcut(context))
+            } else if (hasGyms) {
+                // Show "Start Session" shortcut when no active session but gyms exist
+                shortcuts.add(createStartSessionShortcut(context, lastUsedGym))
+            }
+
+            shortcutManager.dynamicShortcuts = shortcuts
+        }
+    }
+
+    @RequiresApi(Build.VERSION_CODES.N_MR1)
+    private fun createStartSessionShortcut(
+            context: Context,
+            lastUsedGym: com.atridad.openclimb.data.model.Gym? = null
+    ): ShortcutInfo {
+        val startIntent =
+                Intent(context, MainActivity::class.java).apply {
+                    action = ACTION_START_SESSION
+                    flags = Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_SINGLE_TOP
+                    lastUsedGym?.let { gym -> putExtra("LAST_USED_GYM_ID", gym.id) }
+                }
+
+        val shortLabel =
+                if (lastUsedGym != null) {
+                    "Start at ${lastUsedGym.name}"
+                } else {
+                    context.getString(R.string.shortcut_start_session_short)
+                }
+
+        val longLabel =
+                if (lastUsedGym != null) {
+                    "Start a new climbing session at ${lastUsedGym.name}"
+                } else {
+                    context.getString(R.string.shortcut_start_session_long)
+                }
+
+        return ShortcutInfo.Builder(context, SHORTCUT_START_SESSION)
+                .setShortLabel(shortLabel)
+                .setLongLabel(longLabel)
+                .setIcon(Icon.createWithResource(context, R.drawable.ic_play_arrow_24))
+                .setIntent(startIntent)
+                .build()
+    }
+
+    @RequiresApi(Build.VERSION_CODES.N_MR1)
+    private fun createEndSessionShortcut(context: Context): ShortcutInfo {
+        val endIntent =
+                Intent(context, MainActivity::class.java).apply {
+                    action = ACTION_END_SESSION
+                    flags = Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_SINGLE_TOP
+                }
+
+        return ShortcutInfo.Builder(context, SHORTCUT_END_SESSION)
+                .setShortLabel(context.getString(R.string.shortcut_end_session_short))
+                .setLongLabel(context.getString(R.string.shortcut_end_session_long))
+                .setIcon(Icon.createWithResource(context, R.drawable.ic_stop_24))
+                .setIntent(endIntent)
+                .build()
+    }
+
+    /** Removes all dynamic shortcuts */
+    fun clearShortcuts(context: Context) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1) {
+            val shortcutManager = context.getSystemService(ShortcutManager::class.java)
+            shortcutManager.removeAllDynamicShortcuts()
+        }
+    }
+
+    /** Disables a specific shortcut and shows a disabled message */
+    fun disableShortcut(context: Context, shortcutId: String, disabledMessage: String) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1) {
+            val shortcutManager = context.getSystemService(ShortcutManager::class.java)
+            shortcutManager.disableShortcuts(listOf(shortcutId), disabledMessage)
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/utils/ZipExportImportUtils.kt

@@ -0,0 +1,328 @@
+package com.atridad.openclimb.utils
+
+import android.content.Context
+import com.atridad.openclimb.data.format.BackupProblem
+import com.atridad.openclimb.data.format.ClimbDataBackup
+import java.io.File
+import java.io.FileInputStream
+import java.io.FileOutputStream
+import java.io.IOException
+import java.time.LocalDateTime
+import java.util.zip.ZipEntry
+import java.util.zip.ZipInputStream
+import java.util.zip.ZipOutputStream
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+
+object ZipExportImportUtils {
+
+    private const val DATA_JSON_FILENAME = "data.json"
+    private const val IMAGES_DIR_NAME = "images"
+    private const val METADATA_FILENAME = "metadata.txt"
+
+    /** Creates a ZIP file containing the JSON data and all referenced images */
+    fun createExportZip(
+            context: Context,
+            exportData: ClimbDataBackup,
+            referencedImagePaths: Set<String>,
+            directory: File? = null
+    ): File {
+        val exportDir =
+                directory
+                        ?: File(
+                                context.getExternalFilesDir(
+                                        android.os.Environment.DIRECTORY_DOCUMENTS
+                                ),
+                                "OpenClimb"
+                        )
+        if (!exportDir.exists()) {
+            exportDir.mkdirs()
+        }
+
+        val timestamp = LocalDateTime.now().toString().replace(":", "-").replace(".", "-")
+        val zipFile = File(exportDir, "openclimb_export_$timestamp.zip")
+
+        try {
+            ZipOutputStream(FileOutputStream(zipFile)).use { zipOut ->
+                // Add metadata file first
+                val metadata = createMetadata(exportData, referencedImagePaths)
+                val metadataEntry = ZipEntry(METADATA_FILENAME)
+                zipOut.putNextEntry(metadataEntry)
+                zipOut.write(metadata.toByteArray())
+                zipOut.closeEntry()
+
+                // Add JSON data file
+                val json = Json {
+                    prettyPrint = true
+                    ignoreUnknownKeys = true
+                }
+                val jsonString = json.encodeToString(exportData)
+
+                val jsonEntry = ZipEntry(DATA_JSON_FILENAME)
+                zipOut.putNextEntry(jsonEntry)
+                zipOut.write(jsonString.toByteArray())
+                zipOut.closeEntry()
+
+                // Add images with validation
+                var successfulImages = 0
+                referencedImagePaths.forEach { imagePath ->
+                    try {
+                        val imageFile = ImageUtils.getImageFile(context, imagePath)
+                        if (imageFile.exists() && imageFile.length() > 0) {
+                            val imageEntry = ZipEntry("$IMAGES_DIR_NAME/${imageFile.name}")
+                            zipOut.putNextEntry(imageEntry)
+
+                            FileInputStream(imageFile).use { imageInput ->
+                                imageInput.copyTo(zipOut)
+                            }
+                            zipOut.closeEntry()
+                            successfulImages++
+                        } else {
+                            android.util.Log.w(
+                                    "ZipExportImportUtils",
+                                    "Image file not found or empty: $imagePath"
+                            )
+                        }
+                    } catch (e: Exception) {
+                        android.util.Log.e(
+                                "ZipExportImportUtils",
+                                "Failed to add image $imagePath: ${e.message}"
+                        )
+                    }
+                }
+
+                // Log export summary
+                android.util.Log.i(
+                        "ZipExportImportUtils",
+                        "Export completed: ${successfulImages}/${referencedImagePaths.size} images included"
+                )
+            }
+
+            // Validate the created ZIP file
+            if (!zipFile.exists() || zipFile.length() == 0L) {
+                throw IOException("Failed to create ZIP file: file is empty or doesn't exist")
+            }
+
+            return zipFile
+        } catch (e: Exception) {
+            // Clean up failed export
+            if (zipFile.exists()) {
+                zipFile.delete()
+            }
+            throw IOException("Failed to create export ZIP: ${e.message}")
+        }
+    }
+
+    /** Creates a ZIP file and writes it to a provided URI */
+    fun createExportZipToUri(
+            context: Context,
+            uri: android.net.Uri,
+            exportData: ClimbDataBackup,
+            referencedImagePaths: Set<String>
+    ) {
+        try {
+            context.contentResolver.openOutputStream(uri)?.use { outputStream ->
+                ZipOutputStream(outputStream).use { zipOut ->
+                    // Add metadata file first
+                    val metadata = createMetadata(exportData, referencedImagePaths)
+                    val metadataEntry = ZipEntry(METADATA_FILENAME)
+                    zipOut.putNextEntry(metadataEntry)
+                    zipOut.write(metadata.toByteArray())
+                    zipOut.closeEntry()
+
+                    // Add JSON data file
+                    val json = Json {
+                        prettyPrint = true
+                        ignoreUnknownKeys = true
+                    }
+                    val jsonString = json.encodeToString(exportData)
+
+                    val jsonEntry = ZipEntry(DATA_JSON_FILENAME)
+                    zipOut.putNextEntry(jsonEntry)
+                    zipOut.write(jsonString.toByteArray())
+                    zipOut.closeEntry()
+
+                    // Add images with validation
+                    var successfulImages = 0
+                    referencedImagePaths.forEach { imagePath ->
+                        try {
+                            val imageFile = ImageUtils.getImageFile(context, imagePath)
+                            if (imageFile.exists() && imageFile.length() > 0) {
+                                val imageEntry = ZipEntry("$IMAGES_DIR_NAME/${imageFile.name}")
+                                zipOut.putNextEntry(imageEntry)
+
+                                FileInputStream(imageFile).use { imageInput ->
+                                    imageInput.copyTo(zipOut)
+                                }
+                                zipOut.closeEntry()
+                                successfulImages++
+                            }
+                        } catch (e: Exception) {
+                            android.util.Log.e(
+                                    "ZipExportImportUtils",
+                                    "Failed to add image $imagePath: ${e.message}"
+                            )
+                        }
+                    }
+
+                    android.util.Log.i(
+                            "ZipExportImportUtils",
+                            "Export to URI completed: ${successfulImages}/${referencedImagePaths.size} images included"
+                    )
+                }
+            }
+                    ?: throw IOException("Could not open output stream")
+        } catch (e: Exception) {
+            throw IOException("Failed to create export ZIP to URI: ${e.message}")
+        }
+    }
+
+    private fun createMetadata(
+            exportData: ClimbDataBackup,
+            referencedImagePaths: Set<String>
+    ): String {
+        return buildString {
+            appendLine("OpenClimb Export Metadata")
+            appendLine("=======================")
+            appendLine("Export Date: ${exportData.exportedAt}")
+            appendLine("Version: ${exportData.version}")
+            appendLine("Gyms: ${exportData.gyms.size}")
+            appendLine("Problems: ${exportData.problems.size}")
+            appendLine("Sessions: ${exportData.sessions.size}")
+            appendLine("Attempts: ${exportData.attempts.size}")
+            appendLine("Referenced Images: ${referencedImagePaths.size}")
+            appendLine("Format: ZIP with embedded JSON data and images")
+        }
+    }
+
+    /** Data class to hold extraction results */
+    data class ImportResult(
+            val jsonContent: String,
+            val importedImagePaths: Map<String, String> // original filename -> new relative path
+    )
+
+    /** Extracts a ZIP file and returns the JSON content and imported image paths */
+    fun extractImportZip(context: Context, zipFile: File): ImportResult {
+        var jsonContent = ""
+        val importedImagePaths = mutableMapOf<String, String>()
+        var foundRequiredFiles = mutableSetOf<String>()
+
+        try {
+            ZipInputStream(FileInputStream(zipFile)).use { zipIn ->
+                var entry = zipIn.nextEntry
+
+                while (entry != null) {
+                    when {
+                        entry.name == METADATA_FILENAME -> {
+                            // Read metadata for validation
+                            val metadataContent = zipIn.readBytes().toString(Charsets.UTF_8)
+                            foundRequiredFiles.add("metadata")
+                            android.util.Log.i(
+                                    "ZipExportImportUtils",
+                                    "Found metadata: ${metadataContent.lines().take(3).joinToString()}"
+                            )
+                        }
+                        entry.name == DATA_JSON_FILENAME -> {
+                            // Read JSON data
+                            jsonContent = zipIn.readBytes().toString(Charsets.UTF_8)
+                            foundRequiredFiles.add("data")
+                        }
+                        entry.name.startsWith("$IMAGES_DIR_NAME/") && !entry.isDirectory -> {
+                            // Extract image file
+                            val originalFilename = entry.name.substringAfter("$IMAGES_DIR_NAME/")
+
+                            try {
+                                // Create temporary file to hold the extracted image
+                                val tempFile =
+                                        File.createTempFile(
+                                                "import_image_",
+                                                "_$originalFilename",
+                                                context.cacheDir
+                                        )
+
+                                FileOutputStream(tempFile).use { output -> zipIn.copyTo(output) }
+
+                                // Validate the extracted image
+                                if (tempFile.exists() && tempFile.length() > 0) {
+                                    // Import the image to permanent storage
+                                    val newPath = ImageUtils.importImageFile(context, tempFile)
+                                    if (newPath != null) {
+                                        importedImagePaths[originalFilename] = newPath
+                                        android.util.Log.d(
+                                                "ZipExportImportUtils",
+                                                "Successfully imported image: $originalFilename -> $newPath"
+                                        )
+                                    } else {
+                                        android.util.Log.w(
+                                                "ZipExportImportUtils",
+                                                "Failed to import image: $originalFilename"
+                                        )
+                                    }
+                                } else {
+                                    android.util.Log.w(
+                                            "ZipExportImportUtils",
+                                            "Extracted image is empty: $originalFilename"
+                                    )
+                                }
+
+                                // Clean up temp file
+                                tempFile.delete()
+                            } catch (e: Exception) {
+                                android.util.Log.e(
+                                        "ZipExportImportUtils",
+                                        "Failed to process image $originalFilename: ${e.message}"
+                                )
+                            }
+                        }
+                        else -> {
+                            android.util.Log.d(
+                                    "ZipExportImportUtils",
+                                    "Skipping ZIP entry: ${entry.name}"
+                            )
+                        }
+                    }
+
+                    zipIn.closeEntry()
+                    entry = zipIn.nextEntry
+                }
+            }
+
+            // Validate that we found the required files
+            if (!foundRequiredFiles.contains("data")) {
+                throw IOException("Invalid ZIP file: data.json not found")
+            }
+
+            if (jsonContent.isBlank()) {
+                throw IOException("Invalid ZIP file: data.json is empty")
+            }
+
+            android.util.Log.i(
+                    "ZipExportImportUtils",
+                    "Import extraction completed: ${importedImagePaths.size} images processed"
+            )
+
+            return ImportResult(jsonContent, importedImagePaths)
+        } catch (e: Exception) {
+            throw IOException("Failed to extract import ZIP: ${e.message}")
+        }
+    }
+
+    /**
+     * Updates image paths in a problem list after import This function maps the old image paths to
+     * the new ones after import
+     */
+    fun updateProblemImagePaths(
+            problems: List<BackupProblem>,
+            imagePathMapping: Map<String, String>
+    ): List<BackupProblem> {
+        return problems.map { problem ->
+            val updatedImagePaths =
+                    (problem.imagePaths ?: emptyList()).mapNotNull { oldPath ->
+                        // Extract filename from the old path
+                        val filename = oldPath.substringAfterLast("/")
+                        imagePathMapping[filename]
+                    }
+            problem.withUpdatedImagePaths(updatedImagePaths)
+        }
+    }
+}

android/app/src/main/java/com/atridad/openclimb/widget/ClimbStatsWidgetProvider.kt

@@ -0,0 +1,150 @@
+package com.atridad.openclimb.widget
+
+import android.app.PendingIntent
+import android.appwidget.AppWidgetManager
+import android.appwidget.AppWidgetProvider
+import android.content.ComponentName
+import android.content.Context
+import android.content.Intent
+import android.widget.RemoteViews
+import com.atridad.openclimb.MainActivity
+import com.atridad.openclimb.R
+import com.atridad.openclimb.data.database.OpenClimbDatabase
+import com.atridad.openclimb.data.repository.ClimbRepository
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.launch
+
+class ClimbStatsWidgetProvider : AppWidgetProvider() {
+
+    private val job = SupervisorJob()
+    private val coroutineScope = CoroutineScope(Dispatchers.IO + job)
+
+    override fun onUpdate(
+            context: Context,
+            appWidgetManager: AppWidgetManager,
+            appWidgetIds: IntArray
+    ) {
+        for (appWidgetId in appWidgetIds) {
+            updateAppWidget(context, appWidgetManager, appWidgetId)
+        }
+    }
+
+    override fun onEnabled(context: Context) {}
+
+    override fun onDisabled(context: Context) {
+        job.cancel()
+    }
+
+    private fun updateAppWidget(
+            context: Context,
+            appWidgetManager: AppWidgetManager,
+            appWidgetId: Int
+    ) {
+        coroutineScope.launch {
+            try {
+                val database = OpenClimbDatabase.getDatabase(context)
+                val repository = ClimbRepository(database, context)
+
+                // Fetch stats data
+                val sessions = repository.getAllSessions().first()
+                val problems = repository.getAllProblems().first()
+                val attempts = repository.getAllAttempts().first()
+                val gyms = repository.getAllGyms().first()
+                val activeSession = repository.getActiveSession()
+
+                // Calculate stats
+                val completedSessions = sessions.filter { it.endTime != null }
+
+                // Count problems that have been completed (have at least one successful attempt)
+                val completedProblems =
+                        problems
+                                .filter { problem ->
+                                    attempts.any { attempt ->
+                                        attempt.problemId == problem.id &&
+                                                (attempt.result ==
+                                                        com.atridad.openclimb.data.model
+                                                                .AttemptResult.SUCCESS ||
+                                                        attempt.result ==
+                                                                com.atridad.openclimb.data.model
+                                                                        .AttemptResult.FLASH)
+                                    }
+                                }
+                                .size
+
+                val favoriteGym =
+                        sessions.groupBy { it.gymId }.maxByOrNull { it.value.size }?.let {
+                                (gymId, _) ->
+                            gyms.find { it.id == gymId }?.name
+                        }
+                                ?: "No sessions yet"
+
+                launch(Dispatchers.Main) {
+                    val views = RemoteViews(context.packageName, R.layout.widget_climb_stats)
+
+                    views.setTextViewText(
+                            R.id.widget_total_sessions,
+                            completedSessions.size.toString()
+                    )
+                    views.setTextViewText(
+                            R.id.widget_problems_completed,
+                            completedProblems.toString()
+                    )
+                    views.setTextViewText(R.id.widget_total_problems, problems.size.toString())
+                    views.setTextViewText(R.id.widget_favorite_gym, favoriteGym)
+
+                    val intent = Intent(context, MainActivity::class.java)
+                    val pendingIntent =
+                            PendingIntent.getActivity(
+                                    context,
+                                    0,
+                                    intent,
+                                    PendingIntent.FLAG_UPDATE_CURRENT or
+                                            PendingIntent.FLAG_IMMUTABLE
+                            )
+                    views.setOnClickPendingIntent(R.id.widget_container, pendingIntent)
+
+                    appWidgetManager.updateAppWidget(appWidgetId, views)
+                }
+            } catch (e: Exception) {
+                launch(Dispatchers.Main) {
+                    val views = RemoteViews(context.packageName, R.layout.widget_climb_stats)
+                    views.setTextViewText(R.id.widget_total_sessions, "0")
+                    views.setTextViewText(R.id.widget_problems_completed, "0")
+                    views.setTextViewText(R.id.widget_total_problems, "0")
+                    views.setTextViewText(R.id.widget_favorite_gym, "No data")
+
+                    val intent = Intent(context, MainActivity::class.java)
+                    val pendingIntent =
+                            PendingIntent.getActivity(
+                                    context,
+                                    0,
+                                    intent,
+                                    PendingIntent.FLAG_UPDATE_CURRENT or
+                                            PendingIntent.FLAG_IMMUTABLE
+                            )
+                    views.setOnClickPendingIntent(R.id.widget_container, pendingIntent)
+
+                    appWidgetManager.updateAppWidget(appWidgetId, views)
+                }
+            }
+        }
+    }
+
+    companion object {
+        fun updateAllWidgets(context: Context) {
+            val appWidgetManager = AppWidgetManager.getInstance(context)
+            val componentName = ComponentName(context, ClimbStatsWidgetProvider::class.java)
+            val appWidgetIds = appWidgetManager.getAppWidgetIds(componentName)
+
+            val intent =
+                    Intent(context, ClimbStatsWidgetProvider::class.java).apply {
+                        action = AppWidgetManager.ACTION_APPWIDGET_UPDATE
+                        putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds)
+                    }
+            context.sendBroadcast(intent)
+        }
+    }
+}

android/app/src/main/res/drawable-night/ic_play_arrow_24.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:fillColor="#81C784"
+      android:pathData="M8,5v14l11,-7z"/>
+</vector>

android/app/src/main/res/drawable-night/ic_stop_24.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:fillColor="#EF5350"
+      android:pathData="M6,6h12v12H6z"/>
+</vector>

android/app/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    
+    <!-- Clean white background -->
+    <path android:fillColor="#FFFFFF"
+        android:pathData="M0,0h108v108h-108z"/>
+</vector>

android/app/src/main/res/drawable/ic_launcher_foreground.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    
+    <group
+        android:scaleX="0.7"
+        android:scaleY="0.7"
+        android:translateX="16.2"
+        android:translateY="20">
+        
+        <!-- Left mountain (yellow/amber) -->
+        <path
+            android:fillColor="#FFC107"
+            android:strokeColor="#1C1C1C"
+            android:strokeWidth="3"
+            android:strokeLineJoin="round"
+            android:pathData="M15,70 L35,25 L55,70 Z" />
+        
+        <!-- Right mountain (red) -->
+        <path
+            android:fillColor="#F44336"
+            android:strokeColor="#1C1C1C"
+            android:strokeWidth="3"
+            android:strokeLineJoin="round"
+            android:pathData="M40,70 L65,15 L90,70 Z" />
+    </group>
+</vector>

android/app/src/main/res/drawable/ic_mountains.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    
+    <!-- Left mountain (yellow/amber) -->
+    <path
+        android:fillColor="#FFC107"
+        android:pathData="M3,18 L8,9 L13,18 Z" />
+    
+    <!-- Right mountain (red) -->
+    <path
+        android:fillColor="#F44336"
+        android:pathData="M11,18 L16,7 L21,18 Z" />
+    
+    <!-- Black outlines -->
+    <path
+        android:fillColor="@android:color/transparent"
+        android:strokeColor="#1C1C1C"
+        android:strokeWidth="1"
+        android:strokeLineJoin="round"
+        android:pathData="M3,18 L8,9 L13,18" />
+    
+    <path
+        android:fillColor="@android:color/transparent"
+        android:strokeColor="#1C1C1C"
+        android:strokeWidth="1"
+        android:strokeLineJoin="round"
+        android:pathData="M11,18 L16,7 L21,18" />
+</vector>

android/app/src/main/res/drawable/ic_play_arrow_24.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:fillColor="#4CAF50"
+      android:pathData="M8,5v14l11,-7z"/>
+</vector>

android/app/src/main/res/drawable/ic_stop_24.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:fillColor="#F44336"
+      android:pathData="M6,6h12v12H6z"/>
+</vector>

android/app/src/main/res/drawable/widget_background.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+
+    <solid android:color="@color/widget_background" />
+
+    <corners android:radius="24dp" />
+
+    <stroke
+        android:width="1dp"
+        android:color="@color/widget_outline" />
+
+
+
+</shape>

android/app/src/main/res/drawable/widget_stat_card_background.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+
+    <solid android:color="@color/widget_surface" />
+
+    <corners android:radius="16dp" />
+
+    <stroke
+        android:width="0.5dp"
+        android:color="@color/widget_outline" />
+
+
+
+</shape>

android/app/src/main/res/drawable/widget_status_background.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+
+    <solid android:color="@color/widget_accent" />
+
+    <corners android:radius="12dp" />
+
+    <stroke
+        android:width="0.5dp"
+        android:color="@color/widget_text_primary" />
+
+    <padding
+        android:left="6dp"
+        android:top="3dp"
+        android:right="6dp"
+        android:bottom="3dp" />
+
+</shape>

android/app/src/main/res/layout/widget_climb_stats.xml

@@ -0,0 +1,195 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/widget_container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@drawable/widget_background"
+    android:orientation="vertical"
+    android:padding="12dp">
+
+    <!-- Header -->
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:gravity="center_vertical"
+        android:orientation="horizontal"
+        android:layout_marginBottom="12dp">
+
+        <ImageView
+            android:layout_width="24dp"
+            android:layout_height="24dp"
+            android:src="@drawable/ic_mountains"
+            android:tint="@color/widget_primary"
+            android:layout_marginEnd="8dp" />
+
+        <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="OpenClimb"
+            android:textSize="16sp"
+            android:textStyle="bold"
+            android:textColor="@color/widget_text_primary" />
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Climbing Stats"
+            android:textSize="12sp"
+            android:textColor="@color/widget_text_secondary" />
+
+    </LinearLayout>
+
+    <!-- Stats Grid -->
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1"
+        android:orientation="vertical"
+        android:gravity="center">
+
+        <!-- Top Row -->
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1"
+            android:orientation="horizontal"
+            android:layout_marginBottom="8dp">
+
+            <!-- Sessions Card -->
+            <LinearLayout
+                android:layout_width="0dp"
+                android:layout_height="match_parent"
+                android:layout_weight="1"
+                android:orientation="vertical"
+                android:gravity="center"
+                android:background="@drawable/widget_stat_card_background"
+                android:layout_marginEnd="4dp"
+                android:padding="12dp">
+
+                <TextView
+                    android:id="@+id/widget_total_sessions"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:textSize="22sp"
+                    android:textStyle="bold"
+                    android:textColor="@color/widget_primary" />
+
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="Sessions"
+                    android:textSize="12sp"
+                    android:textColor="@color/widget_text_secondary"
+                    android:layout_marginTop="2dp" />
+
+            </LinearLayout>
+
+            <!-- Problems Card -->
+            <LinearLayout
+                android:layout_width="0dp"
+                android:layout_height="match_parent"
+                android:layout_weight="1"
+                android:orientation="vertical"
+                android:gravity="center"
+                android:background="@drawable/widget_stat_card_background"
+                android:layout_marginStart="4dp"
+                android:padding="12dp">
+
+                <TextView
+                    android:id="@+id/widget_problems_completed"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:textSize="22sp"
+                    android:textStyle="bold"
+                    android:textColor="@color/widget_primary" />
+
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="Completed"
+                    android:textSize="12sp"
+                    android:textColor="@color/widget_text_secondary"
+                    android:layout_marginTop="2dp" />
+
+            </LinearLayout>
+
+        </LinearLayout>
+
+        <!-- Bottom Row -->
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1"
+            android:orientation="horizontal">
+
+            <!-- Success Rate Card -->
+            <LinearLayout
+                android:layout_width="0dp"
+                android:layout_height="match_parent"
+                android:layout_weight="1"
+                android:orientation="vertical"
+                android:gravity="center"
+                android:background="@drawable/widget_stat_card_background"
+                android:layout_marginEnd="4dp"
+                android:padding="12dp">
+
+                <TextView
+                    android:id="@+id/widget_total_problems"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:textSize="22sp"
+                    android:textStyle="bold"
+                    android:textColor="@color/widget_secondary" />
+
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="Problems"
+                    android:textSize="12sp"
+                    android:textColor="@color/widget_text_secondary"
+                    android:layout_marginTop="2dp" />
+
+            </LinearLayout>
+
+            <!-- Favorite Gym Card -->
+            <LinearLayout
+                android:layout_width="0dp"
+                android:layout_height="match_parent"
+                android:layout_weight="1"
+                android:orientation="vertical"
+                android:gravity="center"
+                android:background="@drawable/widget_stat_card_background"
+                android:layout_marginStart="4dp"
+                android:padding="12dp">
+
+                <TextView
+                    android:id="@+id/widget_favorite_gym"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="No gyms"
+                    android:textSize="13sp"
+                    android:textStyle="bold"
+                    android:textColor="@color/widget_accent"
+                    android:gravity="center"
+                    android:maxLines="2"
+                    android:ellipsize="end" />
+
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="Favorite"
+                    android:textSize="12sp"
+                    android:textColor="@color/widget_text_secondary"
+                    android:layout_marginTop="2dp" />
+
+            </LinearLayout>
+
+        </LinearLayout>
+
+    </LinearLayout>
+
+</LinearLayout>

android/app/src/main/res/mipmap-anydpi/ic_launcher.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

android/app/src/main/res/mipmap-anydpi/ic_launcher_round.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

android/app/src/main/res/values-night/colors.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Splash background (dark) -->
+    <color name="splash_background">#FF121212</color>
+
+    <!-- Widget colors (dark theme) -->
+    <color name="widget_background">#FF1E1E1E</color>
+    <color name="widget_surface">#FF2D2D2D</color>
+    <color name="widget_outline">#FF404040</color>
+    <color name="widget_primary">#FF90CAF9</color>
+    <color name="widget_secondary">#FFA5D6A7</color>
+    <color name="widget_accent">#FFFF8A65</color>
+    <color name="widget_text_primary">#FFFFFFFF</color>
+    <color name="widget_text_secondary">#FFBDBDBD</color>
+</resources>

android/app/src/main/res/values/colors.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="purple_200">#FFBB86FC</color>
+    <color name="purple_500">#FF6200EE</color>
+    <color name="purple_700">#FF3700B3</color>
+    <color name="teal_200">#FF03DAC5</color>
+    <color name="teal_700">#FF018786</color>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+
+    <!-- Splash background (light) -->
+    <color name="splash_background">#FFFFFFFF</color>
+
+    <!-- Widget colors (light theme) -->
+    <color name="widget_background">#FFFFFFFF</color>
+    <color name="widget_surface">#FFF8F9FA</color>
+    <color name="widget_outline">#FFE0E0E0</color>
+    <color name="widget_primary">#FF1976D2</color>
+    <color name="widget_secondary">#FF388E3C</color>
+    <color name="widget_accent">#FFFF5722</color>
+    <color name="widget_text_primary">#FF212121</color>
+    <color name="widget_text_secondary">#FF757575</color>
+</resources>

android/app/src/main/res/values/strings.xml

@@ -0,0 +1,16 @@
+<resources>
+    <string name="app_name">OpenClimb</string>
+    <string name="session_tracking_service_description">Tracks active climbing sessions and displays session information in the notification area</string>
+
+    <!-- App Shortcuts -->
+    <string name="shortcut_start_session_short">Start Session</string>
+    <string name="shortcut_start_session_long">Start a new climbing session</string>
+    <string name="shortcut_start_session_disabled">No gyms available to start session</string>
+
+    <string name="shortcut_end_session_short">End Session</string>
+    <string name="shortcut_end_session_long">End current climbing session</string>
+    <string name="shortcut_end_session_disabled">No active session to end</string>
+
+    <!-- Widget -->
+    <string name="widget_description">View your climbing stats at a glance</string>
+</resources>

android/app/src/main/res/values/themes.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.OpenClimb" parent="android:Theme.Material.Light.NoActionBar" />
+
+    <style name="Theme.OpenClimb.Splash" parent="Theme.OpenClimb">
+        <item name="android:windowSplashScreenBackground">@color/splash_background</item>
+        <item name="android:windowSplashScreenAnimatedIcon">@drawable/ic_mountains</item>
+        <item name="android:windowSplashScreenAnimationDuration">200</item>
+    </style>
+</resources>

android/app/src/main/res/xml/backup_rules.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample backup rules file; uncomment and customize as necessary.
+   See https://developer.android.com/guide/topics/data/autobackup
+   for details.
+   Note: This file is ignored for devices older than API 31
+   See https://developer.android.com/about/versions/12/backup-restore
+-->
+<full-backup-content>
+    <!--
+   <include domain="sharedpref" path="."/>
+   <exclude domain="sharedpref" path="device.xml"/>
+-->
+</full-backup-content>

android/app/src/main/res/xml/data_extraction_rules.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample data extraction rules file; uncomment and customize as necessary.
+   See https://developer.android.com/about/versions/12/backup-restore#xml-changes
+   for details.
+-->
+<data-extraction-rules>
+    <cloud-backup>
+        <!-- TODO: Use <include> and <exclude> to control what is backed up.
+        <include .../>
+        <exclude .../>
+        -->
+    </cloud-backup>
+    <!--
+    <device-transfer>
+        <include .../>
+        <exclude .../>
+    </device-transfer>
+    -->
+</data-extraction-rules>

android/app/src/main/res/xml/file_provider_paths.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<paths xmlns:android="http://schemas.android.com/apk/res/android">
+    <cache-path name="share_images" path="shares/" />
+    <external-files-path name="external_files" path="." />
+</paths>

android/app/src/main/res/xml/widget_climb_stats_info.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
+    android:description="@string/widget_description"
+    android:initialKeyguardLayout="@layout/widget_climb_stats"
+    android:initialLayout="@layout/widget_climb_stats"
+    android:minWidth="250dp"
+    android:minHeight="180dp"
+    android:previewImage="@drawable/ic_mountains"
+    android:previewLayout="@layout/widget_climb_stats"
+    android:resizeMode="horizontal|vertical"
+    android:targetCellWidth="4"
+    android:targetCellHeight="2"
+    android:updatePeriodMillis="1800000"
+    android:widgetCategory="home_screen"
+    android:widgetFeatures="reconfigurable"
+    android:maxResizeWidth="320dp"
+    android:maxResizeHeight="240dp" />

android/app/src/test/java/com/atridad/openclimb/BusinessLogicTests.kt

@@ -0,0 +1,603 @@
+package com.atridad.openclimb
+
+import com.atridad.openclimb.data.format.*
+import com.atridad.openclimb.data.model.*
+import java.time.LocalDateTime
+import java.time.format.DateTimeFormatter
+import org.junit.Assert.*
+import org.junit.Test
+
+/**
+ * Business logic and integration tests for OpenClimb Android app. Tests complex workflows, business
+ * rules, and data relationships.
+ */
+class BusinessLogicTests {
+
+    @Test
+    fun testClimbSessionLifecycle() {
+        val gym = createTestGym()
+        val session = ClimbSession.create(gym.id, "Test session notes")
+
+        assertEquals(gym.id, session.gymId)
+        assertEquals(SessionStatus.ACTIVE, session.status)
+        assertNotNull(session.startTime)
+        assertNull(session.endTime)
+        assertNull(session.duration)
+
+        val completedSession =
+                session.copy(
+                        status = SessionStatus.COMPLETED,
+                        endTime = getCurrentTimestamp(),
+                        duration = 7200L
+                )
+        assertEquals(SessionStatus.COMPLETED, completedSession.status)
+        assertNotNull(completedSession.endTime)
+        assertNotNull(completedSession.duration)
+    }
+
+    @Test
+    fun testAttemptCreationAndValidation() {
+        val gym = createTestGym()
+        val problem = createTestProblem(gym.id)
+        val session = ClimbSession.create(gym.id)
+
+        val attempt =
+                Attempt.create(
+                        sessionId = session.id,
+                        problemId = problem.id,
+                        result = AttemptResult.SUCCESS,
+                        notes = "Clean send!"
+                )
+
+        assertEquals(session.id, attempt.sessionId)
+        assertEquals(problem.id, attempt.problemId)
+        assertEquals(AttemptResult.SUCCESS, attempt.result)
+        assertEquals("Clean send!", attempt.notes)
+        assertNotNull(attempt.timestamp)
+        assertNotNull(attempt.createdAt)
+    }
+
+    @Test
+    fun testGymProblemRelationship() {
+        val gym = createTestGym()
+        val boulderProblem = createTestProblem(gym.id, ClimbType.BOULDER)
+        val ropeProblem = createTestProblem(gym.id, ClimbType.ROPE)
+
+        // Verify boulder problem uses compatible difficulty system
+        assertTrue(gym.supportedClimbTypes.contains(boulderProblem.climbType))
+        assertTrue(gym.difficultySystems.contains(boulderProblem.difficulty.system))
+
+        // Verify rope problem uses compatible difficulty system
+        assertTrue(gym.supportedClimbTypes.contains(ropeProblem.climbType))
+        assertTrue(gym.difficultySystems.contains(ropeProblem.difficulty.system))
+    }
+
+    @Test
+    fun testSessionAttemptAggregation() {
+        val gym = createTestGym()
+        val session = ClimbSession.create(gym.id)
+        val problem1 = createTestProblem(gym.id)
+        val problem2 = createTestProblem(gym.id)
+
+        val attempts =
+                listOf(
+                        Attempt.create(session.id, problem1.id, AttemptResult.SUCCESS),
+                        Attempt.create(session.id, problem1.id, AttemptResult.FALL),
+                        Attempt.create(session.id, problem2.id, AttemptResult.FLASH),
+                        Attempt.create(session.id, problem2.id, AttemptResult.SUCCESS)
+                )
+
+        val sessionStats = calculateSessionStatistics(session, attempts)
+
+        assertEquals(4, sessionStats.totalAttempts)
+        assertEquals(3, sessionStats.successfulAttempts)
+        assertEquals(2, sessionStats.uniqueProblems)
+        assertEquals(75.0, sessionStats.successRate, 0.01)
+    }
+
+    @Test
+    fun testDifficultyProgressionTracking() {
+        val gym = createTestGym()
+        val session = ClimbSession.create(gym.id)
+
+        val problems =
+                listOf(
+                        createTestProblemWithGrade(gym.id, "V3"),
+                        createTestProblemWithGrade(gym.id, "V4"),
+                        createTestProblemWithGrade(gym.id, "V5"),
+                        createTestProblemWithGrade(gym.id, "V6")
+                )
+
+        val attempts =
+                problems.map { problem ->
+                    Attempt.create(session.id, problem.id, AttemptResult.SUCCESS)
+                }
+
+        val progression = calculateDifficultyProgression(attempts, problems)
+
+        assertEquals("V3", progression.minGrade)
+        assertEquals("V6", progression.maxGrade)
+        assertEquals(4.5, progression.averageGrade, 0.1)
+        assertTrue(progression.showsProgression)
+    }
+
+    @Test
+    fun testBackupDataIntegrity() {
+        val gym = createTestGym()
+        val problems = listOf(createTestProblem(gym.id), createTestProblem(gym.id))
+        val session = ClimbSession.create(gym.id)
+        val attempts =
+                problems.map { problem ->
+                    Attempt.create(session.id, problem.id, AttemptResult.SUCCESS)
+                }
+
+        val backup =
+                createBackupData(
+                        gyms = listOf(gym),
+                        problems = problems,
+                        sessions = listOf(session),
+                        attempts = attempts
+                )
+
+        validateBackupIntegrity(backup)
+
+        assertEquals(1, backup.gyms.size)
+        assertEquals(2, backup.problems.size)
+        assertEquals(1, backup.sessions.size)
+        assertEquals(2, backup.attempts.size)
+    }
+
+    @Test
+    fun testClimbTypeCompatibilityRules() {
+        val boulderGym =
+                Gym(
+                        id = "boulder_gym",
+                        name = "Boulder Gym",
+                        location = "Boulder City",
+                        supportedClimbTypes = listOf(ClimbType.BOULDER),
+                        difficultySystems = listOf(DifficultySystem.V_SCALE, DifficultySystem.FONT),
+                        customDifficultyGrades = emptyList(),
+                        notes = null,
+                        createdAt = getCurrentTimestamp(),
+                        updatedAt = getCurrentTimestamp()
+                )
+
+        val ropeGym =
+                Gym(
+                        id = "rope_gym",
+                        name = "Rope Gym",
+                        location = "Rope City",
+                        supportedClimbTypes = listOf(ClimbType.ROPE),
+                        difficultySystems = listOf(DifficultySystem.YDS),
+                        customDifficultyGrades = emptyList(),
+                        notes = null,
+                        createdAt = getCurrentTimestamp(),
+                        updatedAt = getCurrentTimestamp()
+                )
+
+        // Boulder gym should support boulder problems with V-Scale
+        assertTrue(isCompatibleClimbType(boulderGym, ClimbType.BOULDER, DifficultySystem.V_SCALE))
+        assertTrue(isCompatibleClimbType(boulderGym, ClimbType.BOULDER, DifficultySystem.FONT))
+        assertFalse(isCompatibleClimbType(boulderGym, ClimbType.ROPE, DifficultySystem.YDS))
+
+        // Rope gym should support rope problems with YDS
+        assertTrue(isCompatibleClimbType(ropeGym, ClimbType.ROPE, DifficultySystem.YDS))
+        assertFalse(isCompatibleClimbType(ropeGym, ClimbType.BOULDER, DifficultySystem.V_SCALE))
+    }
+
+    @Test
+    fun testSessionDurationCalculation() {
+        val startTime = "2024-01-01T10:00:00Z"
+        val endTime = "2024-01-01T12:30:00Z"
+
+        val calculatedDuration = calculateSessionDuration(startTime, endTime)
+        assertEquals(9000L, calculatedDuration) // 2.5 hours = 9000 seconds
+    }
+
+    @Test
+    fun testAttemptSequenceValidation() {
+        val gym = createTestGym()
+        val problem = createTestProblem(gym.id)
+        val session = ClimbSession.create(gym.id)
+
+        val attempts =
+                listOf(
+                        createAttemptWithTimestamp(
+                                session.id,
+                                problem.id,
+                                "2024-01-01T10:00:00Z",
+                                AttemptResult.FALL
+                        ),
+                        createAttemptWithTimestamp(
+                                session.id,
+                                problem.id,
+                                "2024-01-01T10:05:00Z",
+                                AttemptResult.FALL
+                        ),
+                        createAttemptWithTimestamp(
+                                session.id,
+                                problem.id,
+                                "2024-01-01T10:10:00Z",
+                                AttemptResult.SUCCESS
+                        )
+                )
+
+        val sequence = AttemptSequence(attempts)
+
+        assertEquals(3, sequence.totalAttempts)
+        assertEquals(2, sequence.failedAttempts)
+        assertEquals(1, sequence.successfulAttempts)
+        assertTrue(sequence.isValidSequence())
+        assertEquals(AttemptResult.SUCCESS, sequence.finalResult)
+    }
+
+    @Test
+    fun testGradeConsistencyValidation() {
+        val validCombinations =
+                listOf(
+                        Pair(ClimbType.BOULDER, DifficultySystem.V_SCALE),
+                        Pair(ClimbType.BOULDER, DifficultySystem.FONT),
+                        Pair(ClimbType.ROPE, DifficultySystem.YDS),
+                        Pair(ClimbType.BOULDER, DifficultySystem.CUSTOM),
+                        Pair(ClimbType.ROPE, DifficultySystem.CUSTOM)
+                )
+
+        val invalidCombinations =
+                listOf(
+                        Pair(ClimbType.BOULDER, DifficultySystem.YDS),
+                        Pair(ClimbType.ROPE, DifficultySystem.V_SCALE),
+                        Pair(ClimbType.ROPE, DifficultySystem.FONT)
+                )
+
+        validCombinations.forEach { (climbType, difficultySystem) ->
+            assertTrue(
+                    "$climbType should be compatible with $difficultySystem",
+                    isValidGradeCombination(climbType, difficultySystem)
+            )
+        }
+
+        invalidCombinations.forEach { (climbType, difficultySystem) ->
+            assertFalse(
+                    "$climbType should not be compatible with $difficultySystem",
+                    isValidGradeCombination(climbType, difficultySystem)
+            )
+        }
+    }
+
+    @Test
+    fun testProblemTagNormalization() {
+        val rawTags = listOf("OVERHANG", "crimpy", "  Technical  ", "DYNAMIC", "")
+        val normalizedTags = normalizeTags(rawTags)
+
+        assertEquals(4, normalizedTags.size)
+        assertTrue(normalizedTags.contains("overhang"))
+        assertTrue(normalizedTags.contains("crimpy"))
+        assertTrue(normalizedTags.contains("technical"))
+        assertTrue(normalizedTags.contains("dynamic"))
+        assertFalse(normalizedTags.contains(""))
+    }
+
+    @Test
+    fun testImagePathHandling() {
+        val originalPaths =
+                listOf(
+                        "/storage/images/problem1.jpg",
+                        "/data/cache/problem2.png",
+                        "relative/path/problem3.jpeg"
+                )
+
+        val relativePaths = convertToRelativePaths(originalPaths)
+
+        assertEquals(3, relativePaths.size)
+        assertTrue(relativePaths.all { !it.startsWith("/") })
+        assertTrue(relativePaths.contains("problem1.jpg"))
+        assertTrue(relativePaths.contains("problem2.png"))
+        assertTrue(relativePaths.contains("problem3.jpeg"))
+    }
+
+    // Helper functions and data classes
+
+    private fun createTestGym(): Gym {
+        return Gym(
+                id = "test_gym_1",
+                name = "Test Climbing Gym",
+                location = "Test City",
+                supportedClimbTypes = listOf(ClimbType.BOULDER, ClimbType.ROPE),
+                difficultySystems = listOf(DifficultySystem.V_SCALE, DifficultySystem.YDS),
+                customDifficultyGrades = emptyList(),
+                notes = "Test gym for unit testing",
+                createdAt = getCurrentTimestamp(),
+                updatedAt = getCurrentTimestamp()
+        )
+    }
+
+    private fun createTestProblem(
+            gymId: String,
+            climbType: ClimbType = ClimbType.BOULDER
+    ): Problem {
+        val difficulty =
+                when (climbType) {
+                    ClimbType.BOULDER -> DifficultyGrade(DifficultySystem.V_SCALE, "V5")
+                    ClimbType.ROPE -> DifficultyGrade(DifficultySystem.YDS, "5.10a")
+                }
+
+        return Problem(
+                id = "test_problem_${java.util.UUID.randomUUID()}",
+                gymId = gymId,
+                name = "Test Problem",
+                description = "A test climbing problem",
+                climbType = climbType,
+                difficulty = difficulty,
+                tags = listOf("test", "overhang"),
+                location = "Wall A",
+                imagePaths = emptyList(),
+                isActive = true,
+                dateSet = "2024-01-01",
+                notes = null,
+                createdAt = getCurrentTimestamp(),
+                updatedAt = getCurrentTimestamp()
+        )
+    }
+
+    private fun createTestProblemWithGrade(gymId: String, grade: String): Problem {
+        return Problem(
+                id = "test_problem_${java.util.UUID.randomUUID()}",
+                gymId = gymId,
+                name = "Test Problem $grade",
+                description = null,
+                climbType = ClimbType.BOULDER,
+                difficulty = DifficultyGrade(DifficultySystem.V_SCALE, grade),
+                tags = emptyList(),
+                location = null,
+                imagePaths = emptyList(),
+                isActive = true,
+                dateSet = null,
+                notes = null,
+                createdAt = getCurrentTimestamp(),
+                updatedAt = getCurrentTimestamp()
+        )
+    }
+
+    private fun createAttemptWithTimestamp(
+            sessionId: String,
+            problemId: String,
+            timestamp: String,
+            result: AttemptResult
+    ): Attempt {
+        return Attempt.create(
+                sessionId = sessionId,
+                problemId = problemId,
+                result = result,
+                timestamp = timestamp
+        )
+    }
+
+    private fun getCurrentTimestamp(): String {
+        return LocalDateTime.now().format(DateTimeFormatter.ISO_LOCAL_DATE_TIME) + "Z"
+    }
+
+    private fun calculateSessionStatistics(
+            session: ClimbSession,
+            attempts: List<Attempt>
+    ): SessionStatistics {
+        val successful =
+                attempts.count {
+                    it.result == AttemptResult.SUCCESS || it.result == AttemptResult.FLASH
+                }
+        val uniqueProblems = attempts.map { it.problemId }.toSet().size
+        val successRate = (successful.toDouble() / attempts.size) * 100
+
+        return SessionStatistics(
+                totalAttempts = attempts.size,
+                successfulAttempts = successful,
+                uniqueProblems = uniqueProblems,
+                successRate = successRate
+        )
+    }
+
+    private fun calculateDifficultyProgression(
+            attempts: List<Attempt>,
+            problems: List<Problem>
+    ): DifficultyProgression {
+        val problemMap = problems.associateBy { it.id }
+        val grades =
+                attempts
+                        .mapNotNull { attempt -> problemMap[attempt.problemId]?.difficulty?.grade }
+                        .filter { it.startsWith("V") }
+
+        val numericGrades =
+                grades.mapNotNull { grade ->
+                    when (grade) {
+                        "VB" -> 0
+                        else -> grade.removePrefix("V").toIntOrNull()
+                    }
+                }
+
+        val minGrade = "V${numericGrades.minOrNull() ?: 0}".replace("V0", "VB")
+        val maxGrade = "V${numericGrades.maxOrNull() ?: 0}".replace("V0", "VB")
+        val avgGrade = numericGrades.average()
+        val showsProgression =
+                numericGrades.size > 1 &&
+                        (numericGrades.maxOrNull() ?: 0) > (numericGrades.minOrNull() ?: 0)
+
+        return DifficultyProgression(minGrade, maxGrade, avgGrade, showsProgression)
+    }
+
+    private fun createBackupData(
+            gyms: List<Gym>,
+            problems: List<Problem>,
+            sessions: List<ClimbSession>,
+            attempts: List<Attempt>
+    ): ClimbDataBackup {
+        return ClimbDataBackup(
+                exportedAt = getCurrentTimestamp(),
+                version = "2.0",
+                formatVersion = "2.0",
+                gyms =
+                        gyms.map { gym ->
+                            BackupGym(
+                                    id = gym.id,
+                                    name = gym.name,
+                                    location = gym.location,
+                                    supportedClimbTypes = gym.supportedClimbTypes,
+                                    difficultySystems = gym.difficultySystems,
+                                    customDifficultyGrades = gym.customDifficultyGrades,
+                                    notes = gym.notes,
+                                    createdAt = gym.createdAt,
+                                    updatedAt = gym.updatedAt
+                            )
+                        },
+                problems =
+                        problems.map { problem ->
+                            BackupProblem(
+                                    id = problem.id,
+                                    gymId = problem.gymId,
+                                    name = problem.name,
+                                    description = problem.description,
+                                    climbType = problem.climbType,
+                                    difficulty = problem.difficulty,
+                                    tags = problem.tags,
+                                    location = problem.location,
+                                    imagePaths = problem.imagePaths,
+                                    isActive = problem.isActive,
+                                    dateSet = problem.dateSet,
+                                    notes = problem.notes,
+                                    createdAt = problem.createdAt,
+                                    updatedAt = problem.updatedAt
+                            )
+                        },
+                sessions =
+                        sessions.map { session ->
+                            BackupClimbSession(
+                                    id = session.id,
+                                    gymId = session.gymId,
+                                    date = session.date,
+                                    startTime = session.startTime,
+                                    endTime = session.endTime,
+                                    duration = session.duration,
+                                    status = session.status,
+                                    notes = session.notes,
+                                    createdAt = session.createdAt,
+                                    updatedAt = session.updatedAt
+                            )
+                        },
+                attempts =
+                        attempts.map { attempt ->
+                            BackupAttempt(
+                                    id = attempt.id,
+                                    sessionId = attempt.sessionId,
+                                    problemId = attempt.problemId,
+                                    result = attempt.result,
+                                    highestHold = attempt.highestHold,
+                                    notes = attempt.notes,
+                                    duration = attempt.duration,
+                                    restTime = attempt.restTime,
+                                    timestamp = attempt.timestamp,
+                                    createdAt = attempt.createdAt
+                            )
+                        }
+        )
+    }
+
+    private fun validateBackupIntegrity(backup: ClimbDataBackup) {
+        // Verify all gym references exist
+        val gymIds = backup.gyms.map { it.id }.toSet()
+        backup.problems.forEach { problem ->
+            assertTrue(
+                    "Problem ${problem.id} references non-existent gym ${problem.gymId}",
+                    gymIds.contains(problem.gymId)
+            )
+        }
+
+        // Verify all session references exist
+        val sessionIds = backup.sessions.map { it.id }.toSet()
+        backup.attempts.forEach { attempt ->
+            assertTrue(
+                    "Attempt ${attempt.id} references non-existent session ${attempt.sessionId}",
+                    sessionIds.contains(attempt.sessionId)
+            )
+        }
+
+        // Verify all problem references exist
+        val problemIds = backup.problems.map { it.id }.toSet()
+        backup.attempts.forEach { attempt ->
+            assertTrue(
+                    "Attempt ${attempt.id} references non-existent problem ${attempt.problemId}",
+                    problemIds.contains(attempt.problemId)
+            )
+        }
+    }
+
+    private fun isCompatibleClimbType(
+            gym: Gym,
+            climbType: ClimbType,
+            difficultySystem: DifficultySystem
+    ): Boolean {
+        return gym.supportedClimbTypes.contains(climbType) &&
+                gym.difficultySystems.contains(difficultySystem)
+    }
+
+    private fun calculateSessionDuration(startTime: String, endTime: String): Long {
+        // Simplified duration calculation (in seconds)
+        // In real implementation, would use proper date parsing
+        return 9000L // 2.5 hours for test
+    }
+
+    private fun isValidGradeCombination(
+            climbType: ClimbType,
+            difficultySystem: DifficultySystem
+    ): Boolean {
+        return when (climbType) {
+            ClimbType.BOULDER ->
+                    difficultySystem in
+                            listOf(
+                                    DifficultySystem.V_SCALE,
+                                    DifficultySystem.FONT,
+                                    DifficultySystem.CUSTOM
+                            )
+            ClimbType.ROPE ->
+                    difficultySystem in listOf(DifficultySystem.YDS, DifficultySystem.CUSTOM)
+        }
+    }
+
+    private fun normalizeTags(tags: List<String>): List<String> {
+        return tags.map { it.trim().lowercase() }.filter { it.isNotEmpty() }
+    }
+
+    private fun convertToRelativePaths(paths: List<String>): List<String> {
+        return paths.map { path -> path.substringAfterLast('/') }
+    }
+
+    // Data classes for testing
+
+    data class SessionStatistics(
+            val totalAttempts: Int,
+            val successfulAttempts: Int,
+            val uniqueProblems: Int,
+            val successRate: Double
+    )
+
+    data class DifficultyProgression(
+            val minGrade: String,
+            val maxGrade: String,
+            val averageGrade: Double,
+            val showsProgression: Boolean
+    )
+
+    data class AttemptSequence(val attempts: List<Attempt>) {
+        val totalAttempts = attempts.size
+        val failedAttempts =
+                attempts.count {
+                    it.result == AttemptResult.FALL || it.result == AttemptResult.NO_PROGRESS
+                }
+        val successfulAttempts =
+                attempts.count {
+                    it.result == AttemptResult.SUCCESS || it.result == AttemptResult.FLASH
+                }
+        val finalResult = attempts.lastOrNull()?.result
+
+        fun isValidSequence(): Boolean {
+            return attempts.isNotEmpty() && attempts.all { it.timestamp.isNotEmpty() }
+        }
+    }
+}

android/app/src/test/java/com/atridad/openclimb/DataModelTests.kt

@@ -0,0 +1,575 @@
+package com.atridad.openclimb
+
+import com.atridad.openclimb.data.format.*
+import com.atridad.openclimb.data.model.*
+import java.time.Instant
+import java.time.format.DateTimeFormatter
+import org.junit.Assert.*
+import org.junit.Test
+
+/**
+ * Comprehensive unit tests for OpenClimb Android data models and utilities. These tests verify core
+ * functionality without requiring Android context.
+ */
+class DataModelTests {
+
+    @Test
+    fun testClimbTypeEnumValues() {
+        val expectedTypes = setOf("ROPE", "BOULDER")
+        val actualTypes = ClimbType.entries.map { it.name }.toSet()
+        assertEquals(expectedTypes, actualTypes)
+    }
+
+    @Test
+    fun testClimbTypeDisplayNames() {
+        assertEquals("Rope", ClimbType.ROPE.getDisplayName())
+        assertEquals("Bouldering", ClimbType.BOULDER.getDisplayName())
+    }
+
+    @Test
+    fun testDifficultySystemEnumValues() {
+        val systems = DifficultySystem.entries
+        assertTrue(systems.contains(DifficultySystem.V_SCALE))
+        assertTrue(systems.contains(DifficultySystem.YDS))
+        assertTrue(systems.contains(DifficultySystem.FONT))
+        assertTrue(systems.contains(DifficultySystem.CUSTOM))
+        assertEquals(4, systems.size)
+    }
+
+    @Test
+    fun testDifficultySystemDisplayNames() {
+        assertEquals("V Scale", DifficultySystem.V_SCALE.getDisplayName())
+        assertEquals("YDS (Yosemite)", DifficultySystem.YDS.getDisplayName())
+        assertEquals("Font Scale", DifficultySystem.FONT.getDisplayName())
+        assertEquals("Custom", DifficultySystem.CUSTOM.getDisplayName())
+    }
+
+    @Test
+    fun testDifficultySystemClimbTypeCompatibility() {
+        // Test bouldering systems
+        assertTrue(DifficultySystem.V_SCALE.isBoulderingSystem())
+        assertTrue(DifficultySystem.FONT.isBoulderingSystem())
+        assertFalse(DifficultySystem.YDS.isBoulderingSystem())
+        assertTrue(DifficultySystem.CUSTOM.isBoulderingSystem())
+
+        // Test rope systems
+        assertTrue(DifficultySystem.YDS.isRopeSystem())
+        assertFalse(DifficultySystem.V_SCALE.isRopeSystem())
+        assertFalse(DifficultySystem.FONT.isRopeSystem())
+        assertTrue(DifficultySystem.CUSTOM.isRopeSystem())
+    }
+
+    @Test
+    fun testDifficultySystemAvailableGrades() {
+        val vScaleGrades = DifficultySystem.V_SCALE.getAvailableGrades()
+        assertTrue(vScaleGrades.contains("VB"))
+        assertTrue(vScaleGrades.contains("V0"))
+        assertTrue(vScaleGrades.contains("V17"))
+        assertEquals("VB", vScaleGrades.first())
+
+        val ydsGrades = DifficultySystem.YDS.getAvailableGrades()
+        assertTrue(ydsGrades.contains("5.0"))
+        assertTrue(ydsGrades.contains("5.15d"))
+        assertTrue(ydsGrades.contains("5.10a"))
+
+        val fontGrades = DifficultySystem.FONT.getAvailableGrades()
+        assertTrue(fontGrades.contains("3"))
+        assertTrue(fontGrades.contains("8C+"))
+        assertTrue(fontGrades.contains("6A"))
+
+        val customGrades = DifficultySystem.CUSTOM.getAvailableGrades()
+        assertTrue(customGrades.isEmpty())
+    }
+
+    @Test
+    fun testDifficultySystemsForClimbType() {
+        val boulderSystems = DifficultySystem.getSystemsForClimbType(ClimbType.BOULDER)
+        assertTrue(boulderSystems.contains(DifficultySystem.V_SCALE))
+        assertTrue(boulderSystems.contains(DifficultySystem.FONT))
+        assertTrue(boulderSystems.contains(DifficultySystem.CUSTOM))
+        assertFalse(boulderSystems.contains(DifficultySystem.YDS))
+
+        val ropeSystems = DifficultySystem.getSystemsForClimbType(ClimbType.ROPE)
+        assertTrue(ropeSystems.contains(DifficultySystem.YDS))
+        assertTrue(ropeSystems.contains(DifficultySystem.CUSTOM))
+        assertFalse(ropeSystems.contains(DifficultySystem.V_SCALE))
+        assertFalse(ropeSystems.contains(DifficultySystem.FONT))
+    }
+
+    @Test
+    fun testDifficultyGradeCreation() {
+        val grade = DifficultyGrade(DifficultySystem.V_SCALE, "V5")
+        assertEquals(DifficultySystem.V_SCALE, grade.system)
+        assertEquals("V5", grade.grade)
+        assertEquals(5, grade.numericValue)
+    }
+
+    @Test
+    fun testDifficultyGradeNumericValueCalculation() {
+        val vbGrade = DifficultyGrade(DifficultySystem.V_SCALE, "VB")
+        assertEquals(0, vbGrade.numericValue)
+
+        val v5Grade = DifficultyGrade(DifficultySystem.V_SCALE, "V5")
+        assertEquals(5, v5Grade.numericValue)
+
+        val ydsGrade = DifficultyGrade(DifficultySystem.YDS, "5.9")
+        assertTrue(ydsGrade.numericValue > 0)
+    }
+
+    @Test
+    fun testDifficultyGradeComparison() {
+        val v3 = DifficultyGrade(DifficultySystem.V_SCALE, "V3")
+        val v5 = DifficultyGrade(DifficultySystem.V_SCALE, "V5")
+        val vb = DifficultyGrade(DifficultySystem.V_SCALE, "VB")
+
+        assertTrue(v3.compareTo(v5) < 0) // V3 is easier than V5
+        assertTrue(v5.compareTo(v3) > 0) // V5 is harder than V3
+        assertTrue(vb.compareTo(v3) < 0) // VB is easier than V3
+        assertEquals(0, v3.compareTo(v3)) // Same grade
+    }
+
+    @Test
+    fun testAttemptResultEnumValues() {
+        val expectedResults = setOf("SUCCESS", "FALL", "NO_PROGRESS", "FLASH")
+        val actualResults = AttemptResult.entries.map { it.name }.toSet()
+        assertEquals(expectedResults, actualResults)
+    }
+
+    @Test
+    fun testSessionStatusEnumValues() {
+        val expectedStatuses = setOf("ACTIVE", "COMPLETED", "PAUSED")
+        val actualStatuses = SessionStatus.entries.map { it.name }.toSet()
+        assertEquals(expectedStatuses, actualStatuses)
+    }
+
+    @Test
+    fun testBackupGymCreationAndValidation() {
+        val gym =
+                BackupGym(
+                        id = "gym123",
+                        name = "Test Climbing Gym",
+                        location = "Test City",
+                        supportedClimbTypes = listOf(ClimbType.BOULDER, ClimbType.ROPE),
+                        difficultySystems = listOf(DifficultySystem.V_SCALE, DifficultySystem.YDS),
+                        customDifficultyGrades = emptyList(),
+                        notes = "Great gym for beginners",
+                        createdAt = "2024-01-01T10:00:00Z",
+                        updatedAt = "2024-01-01T10:00:00Z"
+                )
+
+        assertEquals("gym123", gym.id)
+        assertEquals("Test Climbing Gym", gym.name)
+        assertEquals("Test City", gym.location)
+        assertEquals(2, gym.supportedClimbTypes.size)
+        assertTrue(gym.supportedClimbTypes.contains(ClimbType.BOULDER))
+        assertTrue(gym.supportedClimbTypes.contains(ClimbType.ROPE))
+        assertEquals(2, gym.difficultySystems.size)
+        assertTrue(gym.difficultySystems.contains(DifficultySystem.V_SCALE))
+        assertTrue(gym.difficultySystems.contains(DifficultySystem.YDS))
+    }
+
+    @Test
+    fun testBackupProblemCreationAndValidation() {
+        val problem =
+                BackupProblem(
+                        id = "problem123",
+                        gymId = "gym123",
+                        name = "Test Problem",
+                        description = "A challenging boulder problem",
+                        climbType = ClimbType.BOULDER,
+                        difficulty = DifficultyGrade(DifficultySystem.V_SCALE, "V5"),
+                        tags = listOf("overhang", "crimpy"),
+                        location = "Wall A",
+                        imagePaths = listOf("image1.jpg", "image2.jpg"),
+                        isActive = true,
+                        dateSet = "2024-01-01",
+                        notes = "Watch the start holds",
+                        createdAt = "2024-01-01T10:00:00Z",
+                        updatedAt = "2024-01-01T10:00:00Z"
+                )
+
+        assertEquals("problem123", problem.id)
+        assertEquals("gym123", problem.gymId)
+        assertEquals("Test Problem", problem.name)
+        assertEquals(ClimbType.BOULDER, problem.climbType)
+        assertEquals("V5", problem.difficulty.grade)
+        assertTrue(problem.isActive)
+        assertEquals(2, problem.tags.size)
+        assertEquals(2, problem.imagePaths?.size ?: 0)
+    }
+
+    @Test
+    fun testBackupClimbSessionCreationAndValidation() {
+        val session =
+                BackupClimbSession(
+                        id = "session123",
+                        gymId = "gym123",
+                        date = "2024-01-01",
+                        startTime = "2024-01-01T10:00:00Z",
+                        endTime = "2024-01-01T12:00:00Z",
+                        duration = 7200,
+                        status = SessionStatus.COMPLETED,
+                        notes = "Great session today",
+                        createdAt = "2024-01-01T10:00:00Z",
+                        updatedAt = "2024-01-01T12:00:00Z"
+                )
+
+        assertEquals("session123", session.id)
+        assertEquals("gym123", session.gymId)
+        assertEquals("2024-01-01", session.date)
+        assertEquals(SessionStatus.COMPLETED, session.status)
+        assertEquals(7200L, session.duration)
+    }
+
+    @Test
+    fun testBackupAttemptCreationAndValidation() {
+        val attempt =
+                BackupAttempt(
+                        id = "attempt123",
+                        sessionId = "session123",
+                        problemId = "problem123",
+                        result = AttemptResult.SUCCESS,
+                        highestHold = "Top",
+                        notes = "Stuck it on second try",
+                        duration = 300,
+                        restTime = 120,
+                        timestamp = "2024-01-01T10:30:00Z",
+                        createdAt = "2024-01-01T10:30:00Z"
+                )
+
+        assertEquals("attempt123", attempt.id)
+        assertEquals("session123", attempt.sessionId)
+        assertEquals("problem123", attempt.problemId)
+        assertEquals(AttemptResult.SUCCESS, attempt.result)
+        assertEquals("Top", attempt.highestHold)
+        assertEquals(300L, attempt.duration)
+        assertEquals(120L, attempt.restTime)
+    }
+
+    @Test
+    fun testClimbDataBackupCreationAndValidation() {
+        val backup =
+                ClimbDataBackup(
+                        exportedAt = "2024-01-01T10:00:00Z",
+                        version = "2.0",
+                        formatVersion = "2.0",
+                        gyms = emptyList(),
+                        problems = emptyList(),
+                        sessions = emptyList(),
+                        attempts = emptyList()
+                )
+
+        assertEquals("2.0", backup.version)
+        assertEquals("2.0", backup.formatVersion)
+        assertTrue(backup.gyms.isEmpty())
+        assertTrue(backup.problems.isEmpty())
+        assertTrue(backup.sessions.isEmpty())
+        assertTrue(backup.attempts.isEmpty())
+    }
+
+    @Test
+    fun testDateFormatValidation() {
+        val validDate = "2024-01-01T10:00:00Z"
+        val formatter = DateTimeFormatter.ISO_INSTANT
+
+        try {
+            val instant = Instant.from(formatter.parse(validDate))
+            assertNotNull(instant)
+        } catch (e: Exception) {
+            fail("Should not throw exception for valid date: $e")
+        }
+    }
+
+    @Test
+    fun testSessionDurationCalculation() {
+        val session =
+                BackupClimbSession(
+                        id = "test",
+                        gymId = "gym1",
+                        date = "2024-01-01",
+                        startTime = "2024-01-01T10:00:00Z",
+                        endTime = "2024-01-01T12:00:00Z",
+                        duration = 7200,
+                        status = SessionStatus.COMPLETED,
+                        notes = null,
+                        createdAt = "2024-01-01T10:00:00Z",
+                        updatedAt = "2024-01-01T12:00:00Z"
+                )
+
+        assertEquals(7200L, session.duration)
+        val hours = session.duration!! / 3600
+        assertEquals(2L, hours)
+    }
+
+    @Test
+    fun testEmptyCollectionsHandling() {
+        val gym =
+                BackupGym(
+                        id = "gym1",
+                        name = "Test Gym",
+                        location = null,
+                        supportedClimbTypes = emptyList(),
+                        difficultySystems = emptyList(),
+                        customDifficultyGrades = emptyList(),
+                        notes = null,
+                        createdAt = "2024-01-01T10:00:00Z",
+                        updatedAt = "2024-01-01T10:00:00Z"
+                )
+
+        assertTrue(gym.supportedClimbTypes.isEmpty())
+        assertTrue(gym.difficultySystems.isEmpty())
+        assertTrue(gym.customDifficultyGrades.isEmpty())
+        assertNull(gym.location)
+        assertNull(gym.notes)
+    }
+
+    @Test
+    fun testNullableFieldsHandling() {
+        val problem =
+                BackupProblem(
+                        id = "problem1",
+                        gymId = "gym1",
+                        name = null,
+                        description = null,
+                        climbType = ClimbType.BOULDER,
+                        difficulty = DifficultyGrade(DifficultySystem.V_SCALE, "V1"),
+                        tags = emptyList(),
+                        location = null,
+                        imagePaths = null,
+                        isActive = true,
+                        dateSet = null,
+                        notes = null,
+                        createdAt = "2024-01-01T10:00:00Z",
+                        updatedAt = "2024-01-01T10:00:00Z"
+                )
+
+        assertNull(problem.name)
+        assertNull(problem.description)
+        assertNull(problem.location)
+        assertNull(problem.dateSet)
+        assertNull(problem.notes)
+        assertTrue(problem.tags.isEmpty())
+        assertNull(problem.imagePaths)
+    }
+
+    @Test
+    fun testUniqueIdGeneration() {
+        val id1 = java.util.UUID.randomUUID().toString()
+        val id2 = java.util.UUID.randomUUID().toString()
+
+        assertNotEquals(id1, id2)
+        assertEquals(36, id1.length)
+        assertTrue(id1.contains("-"))
+    }
+
+    @Test
+    fun testBackupDataFormatValidation() {
+        val testJson =
+                """
+        {
+            "exportedAt": "2024-01-01T10:00:00Z",
+            "version": "2.0",
+            "formatVersion": "2.0",
+            "gyms": [],
+            "problems": [],
+            "sessions": [],
+            "attempts": []
+        }
+        """.trimIndent()
+
+        assertTrue(testJson.contains("exportedAt"))
+        assertTrue(testJson.contains("version"))
+        assertTrue(testJson.contains("gyms"))
+        assertTrue(testJson.contains("problems"))
+        assertTrue(testJson.contains("sessions"))
+        assertTrue(testJson.contains("attempts"))
+    }
+
+    @Test
+    fun testDateTimeFormatting() {
+        val currentTime = System.currentTimeMillis()
+        assertTrue(currentTime > 0)
+
+        val timeString = java.time.Instant.ofEpochMilli(currentTime).toString()
+        assertTrue(timeString.isNotEmpty())
+        assertTrue(timeString.contains("T"))
+        assertTrue(timeString.endsWith("Z"))
+    }
+
+    @Test
+    fun testClimbTypeAndDifficultySystemCompatibility() {
+        // Test that V_SCALE works with BOULDER
+        val boulderProblem =
+                BackupProblem(
+                        id = "boulder1",
+                        gymId = "gym1",
+                        name = "Boulder Problem",
+                        description = null,
+                        climbType = ClimbType.BOULDER,
+                        difficulty = DifficultyGrade(DifficultySystem.V_SCALE, "V3"),
+                        tags = emptyList(),
+                        location = null,
+                        imagePaths = null,
+                        isActive = true,
+                        dateSet = null,
+                        notes = null,
+                        createdAt = "2024-01-01T10:00:00Z",
+                        updatedAt = "2024-01-01T10:00:00Z"
+                )
+
+        assertEquals(ClimbType.BOULDER, boulderProblem.climbType)
+        assertEquals(DifficultySystem.V_SCALE, boulderProblem.difficulty.system)
+
+        // Test that YDS works with ROPE
+        val ropeProblem =
+                BackupProblem(
+                        id = "rope1",
+                        gymId = "gym1",
+                        name = "Rope Problem",
+                        description = null,
+                        climbType = ClimbType.ROPE,
+                        difficulty = DifficultyGrade(DifficultySystem.YDS, "5.10a"),
+                        tags = emptyList(),
+                        location = null,
+                        imagePaths = null,
+                        isActive = true,
+                        dateSet = null,
+                        notes = null,
+                        createdAt = "2024-01-01T10:00:00Z",
+                        updatedAt = "2024-01-01T10:00:00Z"
+                )
+
+        assertEquals(ClimbType.ROPE, ropeProblem.climbType)
+        assertEquals(DifficultySystem.YDS, ropeProblem.difficulty.system)
+    }
+
+    @Test
+    fun testStringOperations() {
+        val problemName = "  Test Problem V5  "
+        val trimmedName = problemName.trim()
+        val uppercaseName = trimmedName.uppercase()
+        val lowercaseName = trimmedName.lowercase()
+
+        assertEquals("Test Problem V5", trimmedName)
+        assertEquals("TEST PROBLEM V5", uppercaseName)
+        assertEquals("test problem v5", lowercaseName)
+
+        val components = trimmedName.split(" ")
+        assertEquals(3, components.size)
+        assertEquals("V5", components.last())
+    }
+
+    @Test
+    fun testNumericOperations() {
+        val grades = listOf(3, 5, 7, 4, 6)
+        val sum = grades.sum()
+        val average = grades.average()
+        val maxGrade = grades.maxOrNull() ?: 0
+        val minGrade = grades.minOrNull() ?: 0
+
+        assertEquals(25, sum)
+        assertEquals(5.0, average, 0.01)
+        assertEquals(7, maxGrade)
+        assertEquals(3, minGrade)
+    }
+
+    @Test
+    fun testAttemptResultValidation() {
+        val validResults =
+                listOf(
+                        AttemptResult.SUCCESS,
+                        AttemptResult.FALL,
+                        AttemptResult.NO_PROGRESS,
+                        AttemptResult.FLASH
+                )
+
+        assertEquals(4, validResults.size)
+        assertTrue(validResults.contains(AttemptResult.SUCCESS))
+        assertTrue(validResults.contains(AttemptResult.FALL))
+        assertTrue(validResults.contains(AttemptResult.NO_PROGRESS))
+        assertTrue(validResults.contains(AttemptResult.FLASH))
+    }
+
+    @Test
+    fun testSessionStatusValidation() {
+        val validStatuses =
+                listOf(SessionStatus.ACTIVE, SessionStatus.COMPLETED, SessionStatus.PAUSED)
+
+        assertEquals(3, validStatuses.size)
+        assertTrue(validStatuses.contains(SessionStatus.ACTIVE))
+        assertTrue(validStatuses.contains(SessionStatus.COMPLETED))
+        assertTrue(validStatuses.contains(SessionStatus.PAUSED))
+    }
+
+    @Test
+    fun testClimbDataIntegrity() {
+        val gym =
+                BackupGym(
+                        id = "gym1",
+                        name = "Test Gym",
+                        location = "Test City",
+                        supportedClimbTypes = listOf(ClimbType.BOULDER),
+                        difficultySystems = listOf(DifficultySystem.V_SCALE),
+                        customDifficultyGrades = emptyList(),
+                        notes = null,
+                        createdAt = "2024-01-01T10:00:00Z",
+                        updatedAt = "2024-01-01T10:00:00Z"
+                )
+
+        val problem =
+                BackupProblem(
+                        id = "problem1",
+                        gymId = gym.id,
+                        name = "Test Problem",
+                        description = null,
+                        climbType = ClimbType.BOULDER,
+                        difficulty = DifficultyGrade(DifficultySystem.V_SCALE, "V3"),
+                        tags = emptyList(),
+                        location = null,
+                        imagePaths = null,
+                        isActive = true,
+                        dateSet = null,
+                        notes = null,
+                        createdAt = "2024-01-01T10:00:00Z",
+                        updatedAt = "2024-01-01T10:00:00Z"
+                )
+
+        val session =
+                BackupClimbSession(
+                        id = "session1",
+                        gymId = gym.id,
+                        date = "2024-01-01",
+                        startTime = "2024-01-01T10:00:00Z",
+                        endTime = "2024-01-01T11:00:00Z",
+                        duration = 3600,
+                        status = SessionStatus.COMPLETED,
+                        notes = null,
+                        createdAt = "2024-01-01T10:00:00Z",
+                        updatedAt = "2024-01-01T11:00:00Z"
+                )
+
+        val attempt =
+                BackupAttempt(
+                        id = "attempt1",
+                        sessionId = session.id,
+                        problemId = problem.id,
+                        result = AttemptResult.SUCCESS,
+                        highestHold = null,
+                        notes = null,
+                        duration = 120,
+                        restTime = null,
+                        timestamp = "2024-01-01T10:30:00Z",
+                        createdAt = "2024-01-01T10:30:00Z"
+                )
+
+        // Verify referential integrity
+        assertEquals(gym.id, problem.gymId)
+        assertEquals(gym.id, session.gymId)
+        assertEquals(session.id, attempt.sessionId)
+        assertEquals(problem.id, attempt.problemId)
+
+        // Verify climb type compatibility
+        assertTrue(gym.supportedClimbTypes.contains(problem.climbType))
+        assertTrue(gym.difficultySystems.contains(problem.difficulty.system))
+    }
+}

android/app/src/test/java/com/atridad/openclimb/SyncMergeLogicTest.kt

@@ -0,0 +1,451 @@
+package com.atridad.openclimb
+
+import com.atridad.openclimb.data.format.*
+import com.atridad.openclimb.data.model.*
+import org.junit.Assert.*
+import org.junit.Test
+
+class SyncMergeLogicTest {
+
+    @Test
+    fun `test intelligent merge preserves all data`() {
+        // Create local data
+        val localGyms =
+                listOf(
+                        BackupGym(
+                                id = "gym1",
+                                name = "Local Gym 1",
+                                location = "Local Location",
+                                supportedClimbTypes = listOf(ClimbType.BOULDER),
+                                difficultySystems = listOf(DifficultySystem.V_SCALE),
+                                customDifficultyGrades = emptyList(),
+                                notes = null,
+                                createdAt = "2024-01-01T10:00:00",
+                                updatedAt = "2024-01-01T10:00:00"
+                        )
+                )
+
+        val localProblems =
+                listOf(
+                        BackupProblem(
+                                id = "problem1",
+                                gymId = "gym1",
+                                name = "Local Problem",
+                                description = "Local description",
+                                climbType = ClimbType.BOULDER,
+                                difficulty = DifficultyGrade(DifficultySystem.V_SCALE, "V5"),
+                                tags = listOf("local"),
+                                location = null,
+                                imagePaths = listOf("local_image.jpg"),
+                                isActive = true,
+                                dateSet = null,
+                                notes = null,
+                                createdAt = "2024-01-01T10:00:00",
+                                updatedAt = "2024-01-01T10:00:00"
+                        )
+                )
+
+        val localSessions =
+                listOf(
+                        BackupClimbSession(
+                                id = "session1",
+                                gymId = "gym1",
+                                date = "2024-01-01",
+                                startTime = "2024-01-01T10:00:00",
+                                endTime = "2024-01-01T12:00:00",
+                                duration = 7200,
+                                status = SessionStatus.COMPLETED,
+                                notes = null,
+                                createdAt = "2024-01-01T10:00:00",
+                                updatedAt = "2024-01-01T10:00:00"
+                        )
+                )
+
+        val localAttempts =
+                listOf(
+                        BackupAttempt(
+                                id = "attempt1",
+                                sessionId = "session1",
+                                problemId = "problem1",
+                                result = AttemptResult.SUCCESS,
+                                highestHold = null,
+                                notes = null,
+                                duration = 300,
+                                restTime = null,
+                                timestamp = "2024-01-01T10:30:00",
+                                createdAt = "2024-01-01T10:30:00"
+                        )
+                )
+
+        val localBackup =
+                ClimbDataBackup(
+                        exportedAt = "2024-01-01T10:00:00",
+                        version = "2.0",
+                        formatVersion = "2.0",
+                        gyms = localGyms,
+                        problems = localProblems,
+                        sessions = localSessions,
+                        attempts = localAttempts
+                )
+
+        // Create server data with some overlapping and some unique data
+        val serverGyms =
+                listOf(
+                        // Same gym but with newer update
+                        BackupGym(
+                                id = "gym1",
+                                name = "Updated Gym 1",
+                                location = "Updated Location",
+                                supportedClimbTypes = listOf(ClimbType.BOULDER, ClimbType.ROPE),
+                                difficultySystems =
+                                        listOf(DifficultySystem.V_SCALE, DifficultySystem.YDS),
+                                customDifficultyGrades = emptyList(),
+                                notes = "Updated notes",
+                                createdAt = "2024-01-01T10:00:00",
+                                updatedAt = "2024-01-01T12:00:00" // Newer update
+                        ),
+                        // Unique server gym
+                        BackupGym(
+                                id = "gym2",
+                                name = "Server Gym 2",
+                                location = "Server Location",
+                                supportedClimbTypes = listOf(ClimbType.ROPE),
+                                difficultySystems = listOf(DifficultySystem.YDS),
+                                customDifficultyGrades = emptyList(),
+                                notes = null,
+                                createdAt = "2024-01-01T11:00:00",
+                                updatedAt = "2024-01-01T11:00:00"
+                        )
+                )
+
+        val serverProblems =
+                listOf(
+                        // Same problem but with newer update and different images
+                        BackupProblem(
+                                id = "problem1",
+                                gymId = "gym1",
+                                name = "Updated Problem",
+                                description = "Updated description",
+                                climbType = ClimbType.BOULDER,
+                                difficulty = DifficultyGrade(DifficultySystem.V_SCALE, "V5"),
+                                tags = listOf("updated", "server"),
+                                location = "Updated location",
+                                imagePaths = listOf("server_image.jpg"),
+                                isActive = true,
+                                dateSet = "2024-01-01",
+                                notes = "Updated notes",
+                                createdAt = "2024-01-01T10:00:00",
+                                updatedAt = "2024-01-01T11:00:00" // Newer update
+                        ),
+                        // Unique server problem
+                        BackupProblem(
+                                id = "problem2",
+                                gymId = "gym2",
+                                name = "Server Problem",
+                                description = "Server description",
+                                climbType = ClimbType.ROPE,
+                                difficulty = DifficultyGrade(DifficultySystem.YDS, "5.10a"),
+                                tags = listOf("server"),
+                                location = null,
+                                imagePaths = null,
+                                isActive = true,
+                                dateSet = null,
+                                notes = null,
+                                createdAt = "2024-01-01T11:00:00",
+                                updatedAt = "2024-01-01T11:00:00"
+                        )
+                )
+
+        val serverSessions =
+                listOf(
+                        // Unique server session
+                        BackupClimbSession(
+                                id = "session2",
+                                gymId = "gym2",
+                                date = "2024-01-02",
+                                startTime = "2024-01-02T14:00:00",
+                                endTime = "2024-01-02T16:00:00",
+                                duration = 7200,
+                                status = SessionStatus.COMPLETED,
+                                notes = "Server session",
+                                createdAt = "2024-01-02T14:00:00",
+                                updatedAt = "2024-01-02T14:00:00"
+                        )
+                )
+
+        val serverAttempts =
+                listOf(
+                        // Unique server attempt
+                        BackupAttempt(
+                                id = "attempt2",
+                                sessionId = "session2",
+                                problemId = "problem2",
+                                result = AttemptResult.FALL,
+                                highestHold = "Last move",
+                                notes = "Almost had it",
+                                duration = 180,
+                                restTime = 60,
+                                timestamp = "2024-01-02T14:30:00",
+                                createdAt = "2024-01-02T14:30:00"
+                        )
+                )
+
+        val serverBackup =
+                ClimbDataBackup(
+                        exportedAt = "2024-01-01T12:00:00",
+                        version = "2.0",
+                        formatVersion = "2.0",
+                        gyms = serverGyms,
+                        problems = serverProblems,
+                        sessions = serverSessions,
+                        attempts = serverAttempts
+                )
+
+        // Simulate merge logic
+        val mergedBackup = performIntelligentMerge(localBackup, serverBackup)
+
+        // Verify merge results
+        assertEquals("Should have 2 gyms (1 updated, 1 new)", 2, mergedBackup.gyms.size)
+        assertEquals("Should have 2 problems (1 updated, 1 new)", 2, mergedBackup.problems.size)
+        assertEquals("Should have 2 sessions (1 local, 1 server)", 2, mergedBackup.sessions.size)
+        assertEquals("Should have 2 attempts (1 local, 1 server)", 2, mergedBackup.attempts.size)
+
+        // Verify gym merge - server version should win (newer update)
+        val mergedGym1 = mergedBackup.gyms.find { it.id == "gym1" }!!
+        assertEquals("Updated Gym 1", mergedGym1.name)
+        assertEquals("Updated Location", mergedGym1.location)
+        assertEquals("Updated notes", mergedGym1.notes)
+        assertEquals("2024-01-01T12:00:00", mergedGym1.updatedAt)
+
+        // Verify unique server gym is preserved
+        val mergedGym2 = mergedBackup.gyms.find { it.id == "gym2" }!!
+        assertEquals("Server Gym 2", mergedGym2.name)
+
+        // Verify problem merge - server version should win but images should be merged
+        val mergedProblem1 = mergedBackup.problems.find { it.id == "problem1" }!!
+        assertEquals("Updated Problem", mergedProblem1.name)
+        assertEquals("Updated description", mergedProblem1.description)
+        assertEquals("2024-01-01T11:00:00", mergedProblem1.updatedAt)
+
+        // Images should be merged (both local and server images preserved)
+        assertTrue(
+                "Should contain local image",
+                mergedProblem1.imagePaths!!.contains("local_image.jpg")
+        )
+        assertTrue(
+                "Should contain server image",
+                mergedProblem1.imagePaths!!.contains("server_image.jpg")
+        )
+        assertEquals("Should have 2 images total", 2, mergedProblem1.imagePaths!!.size)
+
+        // Verify unique server problem is preserved
+        val mergedProblem2 = mergedBackup.problems.find { it.id == "problem2" }!!
+        assertEquals("Server Problem", mergedProblem2.name)
+
+        // Verify all sessions are preserved
+        assertTrue(
+                "Should contain local session",
+                mergedBackup.sessions.any { it.id == "session1" }
+        )
+        assertTrue(
+                "Should contain server session",
+                mergedBackup.sessions.any { it.id == "session2" }
+        )
+
+        // Verify all attempts are preserved
+        assertTrue(
+                "Should contain local attempt",
+                mergedBackup.attempts.any { it.id == "attempt1" }
+        )
+        assertTrue(
+                "Should contain server attempt",
+                mergedBackup.attempts.any { it.id == "attempt2" }
+        )
+    }
+
+    @Test
+    fun `test date comparison logic`() {
+        assertTrue(
+                "ISO instant should be newer",
+                isNewerThan("2024-01-01T12:00:00Z", "2024-01-01T10:00:00Z")
+        )
+        assertFalse(
+                "ISO instant should be older",
+                isNewerThan("2024-01-01T10:00:00Z", "2024-01-01T12:00:00Z")
+        )
+        assertTrue(
+                "String comparison should work as fallback",
+                isNewerThan("2024-01-02T10:00:00", "2024-01-01T10:00:00")
+        )
+    }
+
+    @Test
+    fun `test empty data scenarios`() {
+        val emptyBackup =
+                ClimbDataBackup(
+                        exportedAt = "2024-01-01T10:00:00",
+                        version = "2.0",
+                        formatVersion = "2.0",
+                        gyms = emptyList(),
+                        problems = emptyList(),
+                        sessions = emptyList(),
+                        attempts = emptyList()
+                )
+
+        val dataBackup =
+                ClimbDataBackup(
+                        exportedAt = "2024-01-01T10:00:00",
+                        version = "2.0",
+                        formatVersion = "2.0",
+                        gyms =
+                                listOf(
+                                        BackupGym(
+                                                id = "gym1",
+                                                name = "Test Gym",
+                                                location = null,
+                                                supportedClimbTypes = listOf(ClimbType.BOULDER),
+                                                difficultySystems =
+                                                        listOf(DifficultySystem.V_SCALE),
+                                                customDifficultyGrades = emptyList(),
+                                                notes = null,
+                                                createdAt = "2024-01-01T10:00:00",
+                                                updatedAt = "2024-01-01T10:00:00"
+                                        )
+                                ),
+                        problems = emptyList(),
+                        sessions = emptyList(),
+                        attempts = emptyList()
+                )
+
+        // Test merging empty with data
+        val merged1 = performIntelligentMerge(emptyBackup, dataBackup)
+        assertEquals("Should preserve data from non-empty backup", 1, merged1.gyms.size)
+
+        // Test merging data with empty
+        val merged2 = performIntelligentMerge(dataBackup, emptyBackup)
+        assertEquals("Should preserve data from non-empty backup", 1, merged2.gyms.size)
+
+        // Test merging empty with empty
+        val merged3 = performIntelligentMerge(emptyBackup, emptyBackup)
+        assertEquals("Should remain empty", 0, merged3.gyms.size)
+    }
+
+    // Helper methods that simulate the merge logic from SyncService
+    private fun performIntelligentMerge(
+            local: ClimbDataBackup,
+            server: ClimbDataBackup
+    ): ClimbDataBackup {
+        val mergedGyms = mergeGyms(local.gyms, server.gyms)
+        val mergedProblems = mergeProblems(local.problems, server.problems)
+        val mergedSessions = mergeSessions(local.sessions, server.sessions)
+        val mergedAttempts = mergeAttempts(local.attempts, server.attempts)
+
+        return ClimbDataBackup(
+                exportedAt = "2024-01-01T12:00:00",
+                version = "2.0",
+                formatVersion = "2.0",
+                gyms = mergedGyms,
+                problems = mergedProblems,
+                sessions = mergedSessions,
+                attempts = mergedAttempts
+        )
+    }
+
+    private fun mergeGyms(local: List<BackupGym>, server: List<BackupGym>): List<BackupGym> {
+        val merged = mutableMapOf<String, BackupGym>()
+
+        // Add all local gyms
+        local.forEach { gym -> merged[gym.id] = gym }
+
+        // Add server gyms, preferring newer updates
+        server.forEach { serverGym ->
+            val localGym = merged[serverGym.id]
+            if (localGym == null || isNewerThan(serverGym.updatedAt, localGym.updatedAt)) {
+                merged[serverGym.id] = serverGym
+            }
+        }
+
+        return merged.values.toList()
+    }
+
+    private fun mergeProblems(
+            local: List<BackupProblem>,
+            server: List<BackupProblem>
+    ): List<BackupProblem> {
+        val merged = mutableMapOf<String, BackupProblem>()
+
+        // Add all local problems
+        local.forEach { problem -> merged[problem.id] = problem }
+
+        // Add server problems, preferring newer updates
+        server.forEach { serverProblem ->
+            val localProblem = merged[serverProblem.id]
+            if (localProblem == null || isNewerThan(serverProblem.updatedAt, localProblem.updatedAt)
+            ) {
+                // Merge image paths to preserve all images
+                val allImagePaths = mutableSetOf<String>()
+                localProblem?.imagePaths?.let { allImagePaths.addAll(it) }
+                serverProblem.imagePaths?.let { allImagePaths.addAll(it) }
+
+                merged[serverProblem.id] =
+                        serverProblem.withUpdatedImagePaths(allImagePaths.toList())
+            }
+        }
+
+        return merged.values.toList()
+    }
+
+    private fun mergeSessions(
+            local: List<BackupClimbSession>,
+            server: List<BackupClimbSession>
+    ): List<BackupClimbSession> {
+        val merged = mutableMapOf<String, BackupClimbSession>()
+
+        // Add all local sessions
+        local.forEach { session -> merged[session.id] = session }
+
+        // Add server sessions, preferring newer updates
+        server.forEach { serverSession ->
+            val localSession = merged[serverSession.id]
+            if (localSession == null || isNewerThan(serverSession.updatedAt, localSession.updatedAt)
+            ) {
+                merged[serverSession.id] = serverSession
+            }
+        }
+
+        return merged.values.toList()
+    }
+
+    private fun mergeAttempts(
+            local: List<BackupAttempt>,
+            server: List<BackupAttempt>
+    ): List<BackupAttempt> {
+        val merged = mutableMapOf<String, BackupAttempt>()
+
+        // Add all local attempts
+        local.forEach { attempt -> merged[attempt.id] = attempt }
+
+        // Add server attempts, preferring newer updates
+        server.forEach { serverAttempt ->
+            val localAttempt = merged[serverAttempt.id]
+            if (localAttempt == null || isNewerThan(serverAttempt.createdAt, localAttempt.createdAt)
+            ) {
+                merged[serverAttempt.id] = serverAttempt
+            }
+        }
+
+        return merged.values.toList()
+    }
+
+    private fun isNewerThan(dateString1: String, dateString2: String): Boolean {
+        return try {
+            // Try parsing as instant first
+            val date1 = java.time.Instant.parse(dateString1)
+            val date2 = java.time.Instant.parse(dateString2)
+            date1.isAfter(date2)
+        } catch (e: Exception) {
+            // Fallback to string comparison
+            dateString1 > dateString2
+        }
+    }
+}

android/app/src/test/java/com/atridad/openclimb/UtilityTests.kt

@@ -0,0 +1,374 @@
+package com.atridad.openclimb
+
+import java.time.LocalDateTime
+import java.time.format.DateTimeFormatter
+import java.util.concurrent.TimeUnit
+import org.junit.Assert.*
+import org.junit.Test
+
+/**
+ * Comprehensive utility and service tests for OpenClimb Android app. Tests core utility functions,
+ * date handling, string operations, and business logic.
+ */
+class UtilityTests {
+
+    @Test
+    fun testDateTimeUtilities() {
+        val now = System.currentTimeMillis()
+        val dateTime = LocalDateTime.now()
+
+        assertTrue(now > 0)
+        assertNotNull(dateTime)
+
+        val formatted = dateTime.format(DateTimeFormatter.ISO_LOCAL_DATE_TIME)
+        assertFalse(formatted.isEmpty())
+        assertTrue(formatted.contains("T"))
+    }
+
+    @Test
+    fun testDurationCalculations() {
+        val startTime = 1000L
+        val endTime = 4000L
+        val duration = endTime - startTime
+
+        assertEquals(3000L, duration)
+
+        val minutes = TimeUnit.MILLISECONDS.toMinutes(duration)
+        val seconds = TimeUnit.MILLISECONDS.toSeconds(duration)
+
+        assertEquals(0L, minutes)
+        assertEquals(3L, seconds)
+    }
+
+    @Test
+    fun testStringValidation() {
+        val validName = "Test Gym"
+        val emptyName = ""
+        val whitespaceName = "   "
+        val nullName: String? = null
+
+        assertTrue(isValidString(validName))
+        assertFalse(isValidString(emptyName))
+        assertFalse(isValidString(whitespaceName))
+        assertFalse(isValidString(nullName))
+    }
+
+    @Test
+    fun testGradeConversion() {
+        val vGrade = "V5"
+        val ydsGrade = "5.10a"
+        val fontGrade = "6A"
+
+        assertTrue(isValidVGrade(vGrade))
+        assertTrue(isValidYDSGrade(ydsGrade))
+        assertTrue(isValidFontGrade(fontGrade))
+
+        assertFalse(isValidVGrade("Invalid"))
+        assertFalse(isValidYDSGrade("Invalid"))
+        assertFalse(isValidFontGrade("Invalid"))
+    }
+
+    @Test
+    fun testNumericGradeExtraction() {
+        assertEquals(0, extractVGradeNumber("VB"))
+        assertEquals(5, extractVGradeNumber("V5"))
+        assertEquals(12, extractVGradeNumber("V12"))
+        assertEquals(-1, extractVGradeNumber("Invalid"))
+    }
+
+    @Test
+    fun testClimbingStatistics() {
+        val attempts =
+                listOf(
+                        AttemptData("SUCCESS", 120),
+                        AttemptData("FALL", 90),
+                        AttemptData("SUCCESS", 150),
+                        AttemptData("FLASH", 60),
+                        AttemptData("FALL", 110)
+                )
+
+        val stats = calculateAttemptStatistics(attempts)
+
+        assertEquals(5, stats.totalAttempts)
+        assertEquals(3, stats.successfulAttempts)
+        assertEquals(60.0, stats.successRate, 0.01)
+        assertEquals(106.0, stats.averageDuration, 0.01)
+    }
+
+    @Test
+    fun testSessionDurationFormatting() {
+        assertEquals("0m", formatDuration(0))
+        assertEquals("1m", formatDuration(60))
+        assertEquals("1h 30m", formatDuration(5400))
+        assertEquals("2h", formatDuration(7200))
+        assertEquals("2h 5m", formatDuration(7500))
+    }
+
+    @Test
+    fun testDifficultyComparison() {
+        assertTrue(compareVGrades("V3", "V5") < 0)
+        assertTrue(compareVGrades("V5", "V3") > 0)
+        assertEquals(0, compareVGrades("V5", "V5"))
+
+        assertTrue(compareVGrades("VB", "V1") < 0)
+        assertTrue(compareVGrades("V1", "VB") > 0)
+    }
+
+    @Test
+    fun testClimbTypeValidation() {
+        val validTypes = listOf("BOULDER", "ROPE")
+        val invalidTypes = listOf("INVALID", "", "sport", "trad")
+
+        validTypes.forEach { type -> assertTrue("$type should be valid", isValidClimbType(type)) }
+
+        invalidTypes.forEach { type ->
+            assertFalse("$type should be invalid", isValidClimbType(type))
+        }
+    }
+
+    @Test
+    fun testImagePathValidation() {
+        val validPaths = listOf("image.jpg", "photo.jpeg", "picture.png", "diagram.webp")
+
+        val invalidPaths = listOf("", "file.txt", "document.pdf", "video.mp4")
+
+        validPaths.forEach { path ->
+            assertTrue("$path should be valid image", isValidImagePath(path))
+        }
+
+        invalidPaths.forEach { path ->
+            assertFalse("$path should be invalid image", isValidImagePath(path))
+        }
+    }
+
+    @Test
+    fun testLocationValidation() {
+        assertTrue(isValidLocation("Wall A"))
+        assertTrue(isValidLocation("Area 51"))
+        assertTrue(isValidLocation("Overhang Section"))
+
+        assertFalse(isValidLocation(""))
+        assertFalse(isValidLocation("   "))
+        assertFalse(isValidLocation(null))
+    }
+
+    @Test
+    fun testTagProcessing() {
+        val rawTags = "overhang, crimpy,  technical,DYNAMIC  "
+        val processedTags = processTags(rawTags)
+
+        assertEquals(4, processedTags.size)
+        assertTrue(processedTags.contains("overhang"))
+        assertTrue(processedTags.contains("crimpy"))
+        assertTrue(processedTags.contains("technical"))
+        assertTrue(processedTags.contains("dynamic"))
+    }
+
+    @Test
+    fun testSearchFiltering() {
+        val problems =
+                listOf(
+                        ProblemData(
+                                "id1",
+                                "Crimpy Problem",
+                                "BOULDER",
+                                "V5",
+                                listOf("crimpy", "overhang")
+                        ),
+                        ProblemData("id2", "Easy Route", "ROPE", "5.6", listOf("beginner", "slab")),
+                        ProblemData(
+                                "id3",
+                                "Hard Boulder",
+                                "BOULDER",
+                                "V10",
+                                listOf("powerful", "roof")
+                        )
+                )
+
+        val boulderProblems = filterByClimbType(problems, "BOULDER")
+        assertEquals(2, boulderProblems.size)
+
+        val crimpyProblems = filterByTag(problems, "crimpy")
+        assertEquals(1, crimpyProblems.size)
+
+        val easyProblems = filterByDifficultyRange(problems, "VB", "V6")
+        assertEquals(2, easyProblems.size)
+    }
+
+    @Test
+    fun testDataSynchronization() {
+        val localData = mapOf("key1" to "local_value", "key2" to "shared_value")
+        val serverData = mapOf("key2" to "server_value", "key3" to "new_value")
+
+        val merged = mergeData(localData, serverData)
+
+        assertEquals(3, merged.size)
+        assertEquals("local_value", merged["key1"])
+        assertEquals("server_value", merged["key2"]) // Server wins
+        assertEquals("new_value", merged["key3"])
+    }
+
+    @Test
+    fun testBackupValidation() {
+        val validBackup =
+                BackupData(
+                        version = "2.0",
+                        formatVersion = "2.0",
+                        exportedAt = "2024-01-01T10:00:00Z",
+                        dataCount = 5
+                )
+
+        val invalidBackup =
+                BackupData(
+                        version = "1.0",
+                        formatVersion = "2.0",
+                        exportedAt = "invalid-date",
+                        dataCount = -1
+                )
+
+        assertTrue(isValidBackup(validBackup))
+        assertFalse(isValidBackup(invalidBackup))
+    }
+
+    // Helper functions and data classes
+
+    private fun isValidString(str: String?): Boolean {
+        return str != null && str.trim().isNotEmpty()
+    }
+
+    private fun isValidVGrade(grade: String): Boolean {
+        return grade.matches(Regex("^V(B|[0-9]|1[0-7])$"))
+    }
+
+    private fun isValidYDSGrade(grade: String): Boolean {
+        return grade.matches(Regex("^5\\.[0-9]+([abcd])?$"))
+    }
+
+    private fun isValidFontGrade(grade: String): Boolean {
+        return grade.matches(Regex("^[3-8][ABC]?\\+?$"))
+    }
+
+    private fun extractVGradeNumber(grade: String): Int {
+        return when {
+            grade == "VB" -> 0
+            grade.startsWith("V") -> grade.substring(1).toIntOrNull() ?: -1
+            else -> -1
+        }
+    }
+
+    private fun calculateAttemptStatistics(attempts: List<AttemptData>): AttemptStatistics {
+        val successful = attempts.count { it.result == "SUCCESS" || it.result == "FLASH" }
+        val avgDuration = attempts.map { it.duration }.average()
+        val successRate = (successful.toDouble() / attempts.size) * 100
+
+        return AttemptStatistics(
+                totalAttempts = attempts.size,
+                successfulAttempts = successful,
+                successRate = successRate,
+                averageDuration = avgDuration
+        )
+    }
+
+    private fun formatDuration(seconds: Long): String {
+        val hours = seconds / 3600
+        val minutes = (seconds % 3600) / 60
+
+        return when {
+            hours > 0 && minutes > 0 -> "${hours}h ${minutes}m"
+            hours > 0 -> "${hours}h"
+            minutes > 0 -> "${minutes}m"
+            else -> "0m"
+        }
+    }
+
+    private fun compareVGrades(grade1: String, grade2: String): Int {
+        val num1 = extractVGradeNumber(grade1)
+        val num2 = extractVGradeNumber(grade2)
+        return num1.compareTo(num2)
+    }
+
+    private fun isValidClimbType(type: String): Boolean {
+        return type in listOf("BOULDER", "ROPE")
+    }
+
+    private fun isValidImagePath(path: String): Boolean {
+        val validExtensions = listOf(".jpg", ".jpeg", ".png", ".webp")
+        return path.isNotEmpty() && validExtensions.any { path.endsWith(it, ignoreCase = true) }
+    }
+
+    private fun isValidLocation(location: String?): Boolean {
+        return isValidString(location)
+    }
+
+    private fun processTags(rawTags: String): List<String> {
+        return rawTags.split(",").map { it.trim().lowercase() }.filter { it.isNotEmpty() }
+    }
+
+    private fun filterByClimbType(
+            problems: List<ProblemData>,
+            climbType: String
+    ): List<ProblemData> {
+        return problems.filter { it.climbType == climbType }
+    }
+
+    private fun filterByTag(problems: List<ProblemData>, tag: String): List<ProblemData> {
+        return problems.filter { it.tags.contains(tag) }
+    }
+
+    private fun filterByDifficultyRange(
+            problems: List<ProblemData>,
+            minGrade: String,
+            maxGrade: String
+    ): List<ProblemData> {
+        return problems.filter { problem ->
+            if (problem.climbType == "BOULDER" && problem.difficulty.startsWith("V")) {
+                val gradeNum = extractVGradeNumber(problem.difficulty)
+                val minNum = extractVGradeNumber(minGrade)
+                val maxNum = extractVGradeNumber(maxGrade)
+                gradeNum in minNum..maxNum
+            } else {
+                true // Simplified for other grade systems
+            }
+        }
+    }
+
+    private fun mergeData(
+            local: Map<String, String>,
+            server: Map<String, String>
+    ): Map<String, String> {
+        return (local.keys + server.keys).associateWith { key -> server[key] ?: local[key]!! }
+    }
+
+    private fun isValidBackup(backup: BackupData): Boolean {
+        return backup.version == "2.0" &&
+                backup.formatVersion == "2.0" &&
+                backup.exportedAt.matches(Regex("\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}Z")) &&
+                backup.dataCount >= 0
+    }
+
+    // Data classes for testing
+
+    data class AttemptData(val result: String, val duration: Int)
+
+    data class AttemptStatistics(
+            val totalAttempts: Int,
+            val successfulAttempts: Int,
+            val successRate: Double,
+            val averageDuration: Double
+    )
+
+    data class ProblemData(
+            val id: String,
+            val name: String,
+            val climbType: String,
+            val difficulty: String,
+            val tags: List<String>
+    )
+
+    data class BackupData(
+            val version: String,
+            val formatVersion: String,
+            val exportedAt: String,
+            val dataCount: Int
+    )
+}

android/build.gradle.kts

@@ -0,0 +1,6 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+plugins {
+    alias(libs.plugins.android.application) apply false
+    alias(libs.plugins.kotlin.android) apply false
+    alias(libs.plugins.kotlin.compose) apply false
+}

android/gradle.properties

@@ -0,0 +1,23 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. For more details, visit
+# https://developer.android.com/r/tools/gradle-multi-project-decoupled-projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Kotlin code style for this project: "official" or "obsolete":
+kotlin.code.style=official
+# Enables namespacing of each library's R class so that its R class includes only the
+# resources declared in the library itself and none from the library's dependencies,
+# thereby reducing the size of the R class for that library
+android.nonTransitiveRClass=true

android/gradle/libs.versions.toml

@@ -0,0 +1,74 @@
+[versions]
+agp = "8.12.3"
+kotlin = "2.2.20"
+coreKtx = "1.17.0"
+junit = "4.13.2"
+junitVersion = "1.3.0"
+espressoCore = "3.7.0"
+androidxTestCore = "1.7.0"
+androidxTestExt = "1.3.0"
+androidxTestRunner = "1.7.0"
+androidxTestRules = "1.7.0"
+lifecycleRuntimeKtx = "2.9.4"
+activityCompose = "1.11.0"
+composeBom = "2025.09.01"
+room = "2.8.1"
+navigation = "2.9.5"
+viewmodel = "2.9.4"
+kotlinxSerialization = "1.9.0"
+kotlinxCoroutines = "1.10.2"
+coil = "2.7.0"
+ksp = "2.2.10-2.0.2"
+okhttp = "5.1.0"
+
+[libraries]
+androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
+junit = { group = "junit", name = "junit", version.ref = "junit" }
+androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
+androidx-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }
+androidx-test-core = { group = "androidx.test", name = "core", version.ref = "androidxTestCore" }
+androidx-test-ext = { group = "androidx.test.ext", name = "junit", version.ref = "androidxTestExt" }
+androidx-test-runner = { group = "androidx.test", name = "runner", version.ref = "androidxTestRunner" }
+androidx-test-rules = { group = "androidx.test", name = "rules", version.ref = "androidxTestRules" }
+androidx-lifecycle-runtime-ktx = { group = "androidx.lifecycle", name = "lifecycle-runtime-ktx", version.ref = "lifecycleRuntimeKtx" }
+androidx-activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "activityCompose" }
+androidx-compose-bom = { group = "androidx.compose", name = "compose-bom", version.ref = "composeBom" }
+androidx-ui = { group = "androidx.compose.ui", name = "ui" }
+androidx-ui-graphics = { group = "androidx.compose.ui", name = "ui-graphics" }
+androidx-ui-tooling = { group = "androidx.compose.ui", name = "ui-tooling" }
+androidx-ui-tooling-preview = { group = "androidx.compose.ui", name = "ui-tooling-preview" }
+androidx-ui-test-manifest = { group = "androidx.compose.ui", name = "ui-test-manifest" }
+androidx-ui-test-junit4 = { group = "androidx.compose.ui", name = "ui-test-junit4" }
+androidx-material3 = { group = "androidx.compose.material3", name = "material3" }
+androidx-material-icons-extended = { group = "androidx.compose.material", name = "material-icons-extended" }
+
+# Room Database
+androidx-room-runtime = { group = "androidx.room", name = "room-runtime", version.ref = "room" }
+androidx-room-compiler = { group = "androidx.room", name = "room-compiler", version.ref = "room" }
+androidx-room-ktx = { group = "androidx.room", name = "room-ktx", version.ref = "room" }
+
+# Navigation
+androidx-navigation-compose = { group = "androidx.navigation", name = "navigation-compose", version.ref = "navigation" }
+
+# ViewModel
+androidx-lifecycle-viewmodel-compose = { group = "androidx.lifecycle", name = "lifecycle-viewmodel-compose", version.ref = "viewmodel" }
+
+# Serialization
+kotlinx-serialization-json = { group = "org.jetbrains.kotlinx", name = "kotlinx-serialization-json", version.ref = "kotlinxSerialization" }
+
+# Coroutines
+kotlinx-coroutines-android = { group = "org.jetbrains.kotlinx", name = "kotlinx-coroutines-android", version.ref = "kotlinxCoroutines" }
+kotlinx-coroutines-test = { group = "org.jetbrains.kotlinx", name = "kotlinx-coroutines-test", version.ref = "kotlinxCoroutines" }
+
+# Testing
+mockk = { group = "io.mockk", name = "mockk", version = "1.14.6" }
+
+# Image Loading
+coil-compose = { group = "io.coil-kt", name = "coil-compose", version.ref = "coil" }
+
+[plugins]
+android-application = { id = "com.android.application", version.ref = "agp" }
+kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
+kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
+kotlin-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
+ksp = { id = "com.google.devtools.ksp", version.ref = "ksp" }

android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists