train loading for import

apps/edr-freight-api/src/migrations/1960000000000-AddContainerReceiptToBookingContainerUnits.ts

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+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+/**
+ * Per-container receive tracking. A booking's containers arrive individually
+ * (on separate self-haul trucks), so each container unit tracks whether it has
+ * been received into the port and, once staff confirm it, the GRN it belongs to.
+ * A single GRN covers the containers received together — so if the whole booking
+ * arrives at once, all its units share one GRN (per-booking GRN).
+ */
+export class AddContainerReceiptToBookingContainerUnits1960000000000
+  implements MigrationInterface
+{
+  name = 'AddContainerReceiptToBookingContainerUnits1960000000000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE freight.booking_container_units
+        ADD COLUMN IF NOT EXISTS received_to_port boolean NOT NULL DEFAULT false,
+        ADD COLUMN IF NOT EXISTS received_at timestamptz,
+        ADD COLUMN IF NOT EXISTS grn_number varchar(100)
+    `);
+    await queryRunner.query(
+      `CREATE INDEX IF NOT EXISTS "IDX_booking_container_units_grn" ON freight.booking_container_units (grn_number);`,
+    );
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`DROP INDEX IF EXISTS freight."IDX_booking_container_units_grn";`);
+    await queryRunner.query(`
+      ALTER TABLE freight.booking_container_units
+        DROP COLUMN IF EXISTS received_to_port,
+        DROP COLUMN IF EXISTS received_at,
+        DROP COLUMN IF EXISTS grn_number
+    `);
+  }
+}