import { MigrationInterface, QueryRunner } from 'typeorm';

/**
 * Day-level booking pool: customers select a DAY (route + day), not a specific
 * train. The batch engine's pool query filters bookings on
 * (origin_yard_id, destination_yard_id, scheduled_date, status); this partial
 * index backs that scan.
 */
export class AddBookingRouteDayIndex1784100000000 implements MigrationInterface {
  public async up(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`
      CREATE INDEX IF NOT EXISTS idx_bookings_route_day
        ON freight.bookings (origin_yard_id, destination_yard_id, scheduled_date, status)
        WHERE deleted_at IS NULL;
    `);
  }

  public async down(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`DROP INDEX IF EXISTS freight.idx_bookings_route_day;`);
  }
}