690329:2252 Fixing refactor Correspondence GPT-5.3-Codex #05

.windsurf/rules/06-backend-patterns.md

@@ -0,0 +1,63 @@
+---
+trigger: glob
+globs:
+  - "backend/**/*.service.ts"
+  - "backend/**/*.controller.ts"
+  - "backend/**/*.dto.ts"
+  - "backend/**/*.entity.ts"
+---
+
+# Backend Patterns (NestJS)
+
+## Architecture
+
+- **Thin Controller** — business logic in Service layer
+- **DTO Validation** — class-validator + class-transformer
+- **RBAC** — CASL for authorization
+- **Error Handling** — Logger + HttpException
+
+## UUID Resolution Pattern
+
+```typescript
+// Controller - accept UUID in DTO
+@Post()
+async create(@Body() dto: CreateCorrespondenceDto) {
+  // Resolve UUID to internal ID
+  const contract = await this.contractService.findOneByUuid(dto.contractUuid);
+  const contractId = contract.id; // Internal INT for DB queries
+  
+  return this.service.create(dto, contractId);
+}
+
+// Service - use internal ID for DB operations
+async create(dto: CreateCorrespondenceDto, contractId: number) {
+  // Use contractId (INT) for database queries
+  const correspondence = this.repo.create({
+    contractId,  // FK is INT
+    // ... other fields
+  });
+  return this.repo.save(correspondence);
+}
+```
+
+## API Response Pattern
+
+```typescript
+// Entity
+@Entity()
+class Contract extends UuidBaseEntity {
+  @Column({ type: 'uuid' })
+  publicId: string;
+  
+  @PrimaryKey()
+  @Exclude()
+  id: number;
+}
+
+// Response automatically includes publicId as 'id'
+// { id: "019505a1-7c3e-7000-8000-abc123def456", ... }
+```
+
+## Full Guidelines
+
+`specs/05-Engineering-Guidelines/05-02-backend-guidelines.md`