feat(freight): basics of train scheduling

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

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+import { BaseEntity } from '@edr/api-common';
+import { Column, Entity, Index, JoinColumn, ManyToOne, OneToMany, OneToOne } from 'typeorm';
+
+import { Yard } from '../../rule-engine/entities/yard.entity';
+import { TrainSet } from '../../train-sets/entities/train-set.entity';
+import { TrainScheduleBooking } from './train-schedule-booking.entity';
+
+export const TRAIN_SCHEDULE_STATUSES = [
+  'DRAFT',
+  'SCHEDULED',
+  'DISPATCHED',
+  'ARRIVED',
+  'CANCELLED',
+] as const;
+
+export type TrainScheduleStatus = (typeof TRAIN_SCHEDULE_STATUSES)[number];
+
+@Entity({ schema: 'freight', name: 'train_schedules' })
+@Index(['scheduledDepartureDate'])
+@Index(['status'])
+export class TrainSchedule extends BaseEntity {
+  @Column({ name: 'train_set_id', type: 'uuid', unique: true })
+  trainSetId!: string;
+
+  @OneToOne(() => TrainSet, (trainSet) => trainSet.trainSchedule)
+  @JoinColumn({ name: 'train_set_id' })
+  trainSet?: TrainSet;
+
+  @Column({ name: 'origin_station_id', type: 'uuid' })
+  originStationId!: string;
+
+  @ManyToOne(() => Yard)
+  @JoinColumn({ name: 'origin_station_id' })
+  originStation?: Yard;
+
+  @Column({ name: 'destination_station_id', type: 'uuid' })
+  destinationStationId!: string;
+
+  @ManyToOne(() => Yard)
+  @JoinColumn({ name: 'destination_station_id' })
+  destinationStation?: Yard;
+
+  @Column({ name: 'scheduled_departure_date', type: 'timestamptz' })
+  scheduledDepartureDate!: Date;
+
+  @Column({ name: 'scheduled_arrival_date', type: 'timestamptz', nullable: true })
+  scheduledArrivalDate?: Date | null;
+
+  @Column({ name: 'status', type: 'varchar', length: 20, default: 'DRAFT' })
+  status!: TrainScheduleStatus;
+
+  @OneToMany(() => TrainScheduleBooking, (scheduleBooking) => scheduleBooking.trainSchedule)
+  scheduleBookings?: TrainScheduleBooking[];
+}