[TASK-2026-01-20-005] feat: Add multi-tenancy to UOM entities

EPIC-P2-005: UOM Multi-tenancy Sync
- Add tenant_id field to Uom entity
- Add tenant_id field to UomCategory entity
- Add Tenant relation to both entities
- Add UpdateDateColumn for updated_at
- Update indexes for tenant-based unique constraints

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/modules/core/entities/uom-category.entity.ts

@@ -3,28 +3,43 @@ import {
   PrimaryGeneratedColumn,
   Column,
   CreateDateColumn,
+  UpdateDateColumn,
   Index,
   OneToMany,
+  ManyToOne,
+  JoinColumn,
 } from 'typeorm';
 import { Uom } from './uom.entity.js';
+import { Tenant } from '../../auth/entities/tenant.entity.js';
 
 @Entity({ schema: 'core', name: 'uom_categories' })
-@Index('idx_uom_categories_name', ['name'], { unique: true })
+@Index('idx_uom_categories_tenant', ['tenantId'])
+@Index('idx_uom_categories_tenant_name', ['tenantId', 'name'], { unique: true })
 export class UomCategory {
   @PrimaryGeneratedColumn('uuid')
   id: string;
 
-  @Column({ type: 'varchar', length: 100, nullable: false, unique: true })
+  @Column({ type: 'uuid', nullable: false, name: 'tenant_id' })
+  tenantId: string;
+
+  @Column({ type: 'varchar', length: 100, nullable: false })
   name: string;
 
   @Column({ type: 'text', nullable: true })
   description: string | null;
 
   // Relations
+  @ManyToOne(() => Tenant)
+  @JoinColumn({ name: 'tenant_id' })
+  tenant: Tenant;
+
   @OneToMany(() => Uom, (uom) => uom.category)
   uoms: Uom[];
 
   // Audit fields
-  @CreateDateColumn({ name: 'created_at', type: 'timestamp' })
+  @CreateDateColumn({ name: 'created_at', type: 'timestamptz' })
   createdAt: Date;
+
+  @UpdateDateColumn({ name: 'updated_at', type: 'timestamptz' })
+  updatedAt: Date;
 }

src/modules/core/entities/uom.entity.ts

@@ -3,11 +3,13 @@ import {
   PrimaryGeneratedColumn,
   Column,
   CreateDateColumn,
+  UpdateDateColumn,
   Index,
   ManyToOne,
   JoinColumn,
 } from 'typeorm';
 import { UomCategory } from './uom-category.entity.js';
+import { Tenant } from '../../auth/entities/tenant.entity.js';
 
 export enum UomType {
   REFERENCE = 'reference',
@@ -16,14 +18,18 @@ export enum UomType {
 }
 
 @Entity({ schema: 'core', name: 'uom' })
+@Index('idx_uom_tenant', ['tenantId'])
 @Index('idx_uom_category_id', ['categoryId'])
 @Index('idx_uom_code', ['code'])
 @Index('idx_uom_active', ['active'])
-@Index('idx_uom_name_category', ['categoryId', 'name'], { unique: true })
+@Index('idx_uom_tenant_category_name', ['tenantId', 'categoryId', 'name'], { unique: true })
 export class Uom {
   @PrimaryGeneratedColumn('uuid')
   id: string;
 
+  @Column({ type: 'uuid', nullable: false, name: 'tenant_id' })
+  tenantId: string;
+
   @Column({ type: 'uuid', nullable: false, name: 'category_id' })
   categoryId: string;
 
@@ -64,6 +70,10 @@ export class Uom {
   active: boolean;
 
   // Relations
+  @ManyToOne(() => Tenant)
+  @JoinColumn({ name: 'tenant_id' })
+  tenant: Tenant;
+
   @ManyToOne(() => UomCategory, (category) => category.uoms, {
     nullable: false,
   })
@@ -71,6 +81,9 @@ export class Uom {
   category: UomCategory;
 
   // Audit fields
-  @CreateDateColumn({ name: 'created_at', type: 'timestamp' })
+  @CreateDateColumn({ name: 'created_at', type: 'timestamptz' })
   createdAt: Date;
+
+  @UpdateDateColumn({ name: 'updated_at', type: 'timestamptz' })
+  updatedAt: Date;
 }