automate the schedule

apps/edr-freight-api/src/modules/train-schedules/entities/train-schedule.entity.ts

@@ -79,6 +79,10 @@ export class TrainSchedule extends BaseEntity {
   @Column({ name: 'max_wagons', type: 'int', default: 53 })
   maxWagons!: number;
 
+  /** OPEN = accepting/holding bookings; FULL = train filled; CLOSED = manually closed. Orthogonal to `status`. */
+  @Column({ name: 'booking_window_status', type: 'varchar', length: 10, default: 'OPEN' })
+  bookingWindowStatus!: string;
+
   @OneToMany(() => TrainScheduleBooking, (scheduleBooking) => scheduleBooking.trainSchedule)
   scheduleBookings?: TrainScheduleBooking[];
 }