Trying this...

src/pages/api/invoices/[id]/update.ts

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+import type { APIRoute } from "astro";
+import { db } from "../../../../db";
+import { invoices, members } from "../../../../db/schema";
+import { eq, and } from "drizzle-orm";
+import { recalculateInvoiceTotals } from "../../../../utils/invoice";
+
+export const POST: APIRoute = async ({
+  request,
+  redirect,
+  locals,
+  params,
+}) => {
+  const user = locals.user;
+  if (!user) {
+    return redirect("/login");
+  }
+
+  const { id: invoiceId } = params;
+  if (!invoiceId) {
+    return new Response("Invoice ID required", { status: 400 });
+  }
+
+  // Fetch invoice to verify existence
+  const invoice = await db
+    .select()
+    .from(invoices)
+    .where(eq(invoices.id, invoiceId))
+    .get();
+
+  if (!invoice) {
+    return new Response("Invoice not found", { status: 404 });
+  }
+
+  // Verify membership
+  const membership = await db
+    .select()
+    .from(members)
+    .where(
+      and(
+        eq(members.userId, user.id),
+        eq(members.organizationId, invoice.organizationId)
+      )
+    )
+    .get();
+
+  if (!membership) {
+    return new Response("Unauthorized", { status: 401 });
+  }
+
+  const formData = await request.formData();
+  const number = formData.get("number") as string;
+  const currency = formData.get("currency") as string;
+  const issueDateStr = formData.get("issueDate") as string;
+  const dueDateStr = formData.get("dueDate") as string;
+  const taxRateStr = formData.get("taxRate") as string;
+  const notes = formData.get("notes") as string;
+
+  if (!number || !currency || !issueDateStr || !dueDateStr) {
+    return new Response("Missing required fields", { status: 400 });
+  }
+
+  try {
+    const issueDate = new Date(issueDateStr);
+    const dueDate = new Date(dueDateStr);
+    const taxRate = taxRateStr ? parseFloat(taxRateStr) : 0;
+
+    await db
+      .update(invoices)
+      .set({
+        number,
+        currency,
+        issueDate,
+        dueDate,
+        taxRate,
+        notes: notes || null,
+      })
+      .where(eq(invoices.id, invoiceId));
+
+    // Recalculate totals in case tax rate changed
+    await recalculateInvoiceTotals(invoiceId);
+
+    return redirect(`/dashboard/invoices/${invoiceId}`);
+  } catch (error) {
+    console.error("Error updating invoice:", error);
+    return new Response("Internal Server Error", { status: 500 });
+  }
+};