trains, wagons,containers and cargoes schema and API

apps/edr-freight-api/src/modules/container-management/entities/container.entity.ts

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+// apps/edr-freight-api/src/modules/container-management/entities/container.entity.ts
+import { Entity, Column, ManyToOne, OneToMany, JoinColumn } from 'typeorm';
+import { BaseEntity } from '@edr/api-common';
+import { Wagon } from '../../wagons/entities/wagon.entity';
+import { Cargo } from '../../cargoes/entities/cargoes.entity';
+
+@Entity({ name: 'containers', schema: 'freight' })
+export class Container extends BaseEntity {
+  @Column({ unique: true, name: 'container_number' })
+  containerNumber!: string;
+
+  @Column({ name: 'container_type_id', type: 'uuid' })
+  containerTypeId!: string;
+
+  @Column({ name: 'wagon_id', type: 'uuid', nullable: true })
+  wagonId!: string | null;
+
+  @Column({ type: 'int', nullable: true })
+  position!: number | null; // position on the wagon (1..N)
+
+  @Column({ name: 'tare_weight', type: 'decimal', precision: 10, scale: 2 })
+  tareWeight!: number;
+
+  @Column({ name: 'max_gross_weight', type: 'decimal', precision: 10, scale: 2 })
+  maxGrossWeight!: number;
+
+  @Column({
+  name: 'seal_number',
+  type: 'varchar',
+  nullable: true,
+})
+sealNumber!: string | null;
+
+  @Column({ type: 'varchar', default: 'AVAILABLE' })
+  status!: string; // AVAILABLE, LOADED, IN_TRANSIT, MAINTENANCE, DAMAGED
+
+  // Relationship to Wagon
+  @ManyToOne(() => Wagon, (wagon) => wagon.containers, { onDelete: 'SET NULL' })
+  @JoinColumn({ name: 'wagon_id' })
+  wagon!: Wagon | null;
+
+  // Relationship to Cargo
+  @OneToMany(() => Cargo, (cargo) => cargo.container)
+  cargoes!: Cargo[];
+}