edr-platform/apps/edr-freight-api/src/migrations/3670000000000-AdjustmentLogNullableSchedule.ts

import { MigrationInterface, QueryRunner } from 'typeorm';

/**
 * A consist adjustment made from the TRAIN BUILDER on a train with no live
 * schedule still belongs in the wagon adjustment history — it just has no
 * schedule to point at. Relax the NOT NULL so builder detaches/attaches can
 * be recorded; every existing reader filters BY train_schedule_id or
 * train_id, so nullable rows are invisible to them.
 */
export class AdjustmentLogNullableSchedule3670000000000 implements MigrationInterface {
  name = 'AdjustmentLogNullableSchedule3670000000000';

  public async up(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`
      ALTER TABLE freight.schedule_wagon_adjustment_logs
        ALTER COLUMN train_schedule_id DROP NOT NULL
    `);
  }

  public async down(_queryRunner: QueryRunner): Promise<void> {
    // No-op: restoring NOT NULL would fail on any builder-origin rows written
    // while this migration was live, re-introducing the outage it fixed.
  }
}