edr-platform/apps/edr-freight-api/src/migrations/3070000000000-AddBulkTotalWeightTons.ts

import { MigrationInterface, QueryRunner } from 'typeorm';

/**
 * Break-bulk (PER_ITEM) bookings store their item count in
 * cargo_total_weight_vgm, so the actual tonnage was never captured — wagon
 * allocation divided an item COUNT by a tons capacity and under-allocated
 * (400 machines ÷ 69T wagon read as 6 wagons instead of 12). New column holds
 * the real total weight in tons for PER_ITEM cargo; null for PER_TON bulk and
 * container bookings.
 */
export class AddBulkTotalWeightTons3070000000000 implements MigrationInterface {
  name = 'AddBulkTotalWeightTons3070000000000';

  public async up(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(
      `ALTER TABLE freight.bookings ADD COLUMN IF NOT EXISTS bulk_total_weight_tons numeric(12,3);`,
    );
  }

  public async down(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(
      `ALTER TABLE freight.bookings DROP COLUMN IF EXISTS bulk_total_weight_tons;`,
    );
  }
}