Truck detention was timed once per delivery, so every truck on a multi-truck last mile was billed the same number of days regardless of when it actually arrived or was released. Each truck now carries its own detention clock (destination arrival → release) with its own rule match, chargeable days and amount; the modal records and displays the window per truck, and the summary shows the longest detention plus the combined total. Also corrected a false no detention rule matches warning that appeared whenever more than one truck was assigned.

apps/edr-freight-api/src/migrations/2860000000000-AddPerTruckDetentionWindow.ts

@@ -0,0 +1,35 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+/**
+ * Per-truck detention clocks. Detention was timed once per last-mile leg
+ * (last_mile.arrived_at / delivered_at), so every truck on a multi-truck
+ * delivery shared one window and was billed identical days — wrong the moment
+ * two trucks arrive or return at different times.
+ *
+ * Deliberately NEW columns rather than reusing the existing per-truck
+ * arrived_at / departed_at on this table: those are WAREHOUSE gate-in/gate-out
+ * events stamped by release(), whereas detention runs from arrival at the
+ * DESTINATION until the truck is released/returned.
+ *
+ * Both nullable — a truck without its own window falls back to the leg-level
+ * timestamps, so legacy legs keep billing exactly as before.
+ */
+export class AddPerTruckDetentionWindow2860000000000 implements MigrationInterface {
+  name = 'AddPerTruckDetentionWindow2860000000000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE freight.last_mile_vehicle_assignments
+        ADD COLUMN IF NOT EXISTS destination_arrived_at timestamptz,
+        ADD COLUMN IF NOT EXISTS returned_at            timestamptz;
+    `);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE freight.last_mile_vehicle_assignments
+        DROP COLUMN IF EXISTS returned_at,
+        DROP COLUMN IF EXISTS destination_arrived_at;
+    `);
+  }
+}