feat(trips): trip tracking with analytics, tag conversion, and transaction assignment

Adds trips table usage across API and UI: trip CRUD, per-trip analytics
(category/daily/merchant/tag/participant breakdowns), tag-to-trip
conversion, trip assignment via transaction overrides, and trip filter
in the transactions view. Recovered from working tree after local git
corruption; feature was already live via host-context Docker builds.

src/app/api/transactions/[id]/route.ts

@@ -23,7 +23,7 @@ export async function PATCH(
   const transactionId = Number(id);
   const body = await req.json();
 
-  const { category, merchant_normalized, notes, transaction_type, my_share_percent, description, amount, transaction_date } = body as {
+  const { category, merchant_normalized, notes, transaction_type, my_share_percent, description, amount, transaction_date, trip_id } = body as {
     category?: string;
     merchant_normalized?: string;
     notes?: string;
@@ -32,6 +32,7 @@ export async function PATCH(
     description?: string;
     amount?: number;
     transaction_date?: string;
+    trip_id?: number | null;
   };
 
   if (my_share_percent !== undefined && my_share_percent !== null) {
@@ -72,8 +73,8 @@ export async function PATCH(
     );
   }
 
-  // category/merchant/notes/my_share_percent go through the overrides table
-  const hasOverride = category !== undefined || merchant_normalized !== undefined || notes !== undefined || my_share_percent !== undefined;
+  // category/merchant/notes/my_share_percent/trip_id go through the overrides table
+  const hasOverride = category !== undefined || merchant_normalized !== undefined || notes !== undefined || my_share_percent !== undefined || trip_id !== undefined;
   if (!hasOverride) {
     return NextResponse.json({ ok: true });
   }
@@ -83,6 +84,7 @@ export async function PATCH(
   if (merchant_normalized !== undefined) data.merchant_normalized = merchant_normalized;
   if (notes !== undefined) data.notes = notes;
   if (my_share_percent !== undefined) data.my_share_percent = my_share_percent;
+  if (trip_id !== undefined) data.trip_id = trip_id;
 
   const override = await prisma.transaction_overrides.upsert({
     where: { transaction_id: transactionId },
@@ -93,6 +95,7 @@ export async function PATCH(
       merchant_normalized: merchant_normalized || null,
       notes: notes || null,
       my_share_percent: my_share_percent != null ? String(my_share_percent) : null,
+      trip_id: trip_id ?? null,
     },
   });
 

src/app/api/transactions/bulk/route.ts

@@ -1,5 +1,6 @@
 import { NextRequest, NextResponse } from "next/server";
 import { prisma, queryRaw } from "@/lib/db";
+import { assignTransactionsToTrip } from "@/lib/queries";
 
 export async function POST(req: NextRequest) {
   const body = await req.json();
@@ -77,5 +78,11 @@ export async function POST(req: NextRequest) {
     return NextResponse.json({ updated: ids.length });
   }
 
+  if (action === "assign_trip") {
+    const { trip_id } = body as { ids: number[]; trip_id: number | null };
+    await assignTransactionsToTrip(trip_id, ids);
+    return NextResponse.json({ updated: ids.length });
+  }
+
   return NextResponse.json({ error: "Invalid action" }, { status: 400 });
 }

src/app/api/transactions/route.ts

@@ -25,6 +25,7 @@ export async function GET(req: NextRequest) {
     amount_min: sp.get("amount_min") ? Number(sp.get("amount_min")) : undefined,
     amount_max: sp.get("amount_max") ? Number(sp.get("amount_max")) : undefined,
     has_split: sp.get("has_split") || undefined,
+    trip_id: sp.get("trip_id") || undefined,
   });
 
   return NextResponse.json(result);