trains, wagons,containers and cargoes schema and API

apps/edr-freight-api/src/modules/wagons/entities/wagon.entity.ts

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+// apps/edr-freight-api/src/modules/wagons/entities/wagon.entity.ts
+import { Entity, Column, ManyToOne, OneToMany, JoinColumn } from 'typeorm';
+import { BaseEntity } from '@edr/api-common';
+import { Train } from '../../trains/entities/train.entity';
+import { Container } from '../../container-management/entities/container.entity';
+
+@Entity({ name: 'wagons', schema: 'freight' })
+export class Wagon extends BaseEntity {
+  @Column({ unique: true, name: 'wagon_number' })
+  wagonNumber!: string;
+
+  @Column({ name: 'wagon_type_id', type: 'uuid' })
+  wagonTypeId!: string;
+
+  @Column({ name: 'train_id', type: 'uuid', nullable: true })
+  trainId!: string | null;
+
+  @Column({ name: 'sequence_number', type: 'int', nullable: true })
+  sequenceNumber!: number | null;
+
+  @Column({ name: 'tare_weight', type: 'decimal', precision: 10, scale: 2 })
+  tareWeight!: number;
+
+  @Column({ name: 'max_payload_weight', type: 'decimal', precision: 10, scale: 2 })
+  maxPayloadWeight!: number;
+
+  @Column({ type: 'varchar', default: 'AVAILABLE' })
+  status!: string; // AVAILABLE, ASSIGNED, MAINTENANCE, RETIRED
+
+  @Column({ type: 'text', nullable: true })
+  notes!: string | null;
+
+  // Relationship to Train
+  @ManyToOne(() => Train, (train) => train.wagons, { onDelete: 'SET NULL' })
+  @JoinColumn({ name: 'train_id' })
+  train!: Train | null;
+
+  // Relationship to Container
+  @OneToMany(() => Container, (container) => container.wagon)
+  containers!: Container[];
+}