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Technical Debt Cleanup (Medium/Low Priority) - Implementation Feedback

Overview

This document summarizes the implementation of medium and low priority technical debt items (Phases 5l through 5w) as defined in the prompt files.

Date: 2026-01-17
Phases Completed: 12 (5l, 5m, 5n, 5o, 5p, 5q, 5r, 5s, 5t, 5u, 5v, 5w)
Total Commits: 10

Phase 5l: ESLint Test Setup Cleanup (TD-010)

Implementation Summary

Removed ESLint disable comments from E2E test setup files and configured proper ESLint rules.

Files Created

  • apps/api-e2e/src/support/global.d.ts - Global type declarations

Files Modified

  • apps/api-e2e/eslint.config.mjs - Added overrides for test setup files
  • apps/api-e2e/src/support/global-setup.ts
  • apps/api-e2e/src/support/global-teardown.ts
  • apps/api-e2e/src/support/test-setup.ts

Challenges Encountered

  • None. Implementation was straightforward.

Deviations from Prompt

  • None.

Phase 5m: Unused Component Cleanup (TD-011)

Implementation Summary

Removed the unused Nx welcome component and its scaffolding folder.

Files Deleted

  • apps/web/src/app/nx-welcome.tsx
  • apps/web/src/app/app.tsx
  • apps/web/src/app/app.module.css

Challenges Encountered

  • Discovery that apps/web/src/app/ was entirely unused - the actual app lives at apps/web/src/app.tsx.

Deviations from Prompt

  • Removed entire app/ folder rather than just nx-welcome.tsx since all content was unused.

Phase 5n: Rate Limiting Implementation (TD-012)

Implementation Summary

Implemented global rate limiting using @nestjs/throttler.

Files Created

  • apps/api/src/throttler/throttler.module.ts
  • apps/api/src/throttler/throttle.decorators.ts
  • apps/api/src/throttler/index.ts

Files Modified

  • apps/api/src/app/app.module.ts
  • apps/api/src/config/configuration.ts
  • apps/api/src/health/health.controller.ts - Added @SkipThrottle()
  • apps/api/src/shopify/shopify.controller.ts - Added @WebhookThrottle()
  • apps/api/src/simplyprint/simplyprint-webhook.controller.ts - Added @WebhookThrottle()

Configuration

RATE_LIMIT_TTL_SECONDS=60
RATE_LIMIT_DEFAULT=100
RATE_LIMIT_WEBHOOK=50

Deviations from Prompt

  • Did not implement Redis storage for distributed rate limiting (optional phase).
  • Did not add rate limit headers interceptor (can be added later).

Phase 5o: Database Connection Pool Configuration (TD-013)

Implementation Summary

Configured explicit Prisma connection pool settings via environment variables.

Files Modified

  • apps/api/src/config/configuration.ts - Added pool config interface
  • apps/api/src/database/prisma.service.ts - Builds URL with pool parameters

Configuration

DATABASE_POOL_SIZE=10
DATABASE_CONNECT_TIMEOUT_SECONDS=5
DATABASE_POOL_TIMEOUT_SECONDS=10

Deviations from Prompt

  • Did not create separate prisma-metrics.service.ts (Prisma doesn't expose pool metrics directly).
  • Pool configuration is appended to DATABASE_URL as query parameters.

Phase 5p: API Versioning Headers (TD-014)

Implementation Summary

Added API version headers to all responses.

Files Created

  • apps/api/src/versioning/api-version.constants.ts
  • apps/api/src/versioning/api-version.interceptor.ts
  • apps/api/src/versioning/deprecated.decorator.ts
  • apps/api/src/versioning/deprecated.interceptor.ts
  • apps/api/src/versioning/index.ts

Headers Added

  • X-API-Version: Current API version (1.0.0)
  • X-API-Min-Version: Minimum supported version (1.0.0)
  • X-API-Deprecated: Whether endpoint is deprecated (false)
  • Sunset: When deprecated endpoint will be removed

Deviations from Prompt

  • None significant.

Phase 5q: Shipment Service Tests (TD-015)

Implementation Summary

Added comprehensive unit tests for shipments service and controller.

Files Created

  • apps/api/src/shipments/__tests__/shipments.service.spec.ts
  • apps/api/src/shipments/__tests__/shipments.controller.spec.ts

Test Coverage Added

  • ShipmentsService: 14 tests covering all methods
  • ShipmentsController: 8 tests covering all endpoints

Challenges Encountered

  1. Type Mismatches: Mock data needed all Prisma Shipment fields including weight, dimensions, errorMessage, shippedAt.
  2. Enum Values: ShipmentStatus.SHIPPED doesn't exist - used ANNOUNCED and IN_TRANSIT instead.
  3. Return Types: findMany returns ShipmentWithOrder[] with included order relation.

Test Count

  • Before: 414 tests
  • After: 436 tests (+22)

Phase 5r: Metadata Type Definitions (TD-016)

Implementation Summary

Created Zod schemas for order and print job metadata.

Files Created

  • libs/domain/src/schemas/order-metadata.schema.ts
  • libs/domain/src/schemas/print-job-metadata.schema.ts

Types Added

  • OrderMetadata: shopifyNoteAttributes, customFields, source, shopifyData
  • PrintJobMetadata: simplyPrintJobId, printerId, filamentUsedGrams, errorDetails

Deviations from Prompt

  • Did not replace all Record<string, unknown> usages - schemas are available for future adoption.

Phase 5s: Prisma Decoupling from Domain (TD-017)

Implementation Summary

Already resolved in a previous phase. Domain contracts use string union types instead of Prisma imports.

Verification

rg "@prisma/client" libs/ --type ts
# No matches found

Phase 5t: Dead Code Cleanup (TD-018)

Implementation Summary

Ran ESLint auto-fix and removed unnecessary React fragment.

Files Modified

  • apps/web/src/router.tsx - Removed useless fragment wrapper

Deviations from Prompt

  • Did not add noUnusedLocals to tsconfig (too strict for current codebase).

Phase 5u: File Naming Convention (TD-019)

Implementation Summary

Standardized file naming to kebab-case.

Files Renamed

  • ErrorBoundary.tsx → error-boundary.tsx

Files Modified

  • apps/web/src/main.tsx - Updated import

Audit Result

Only one non-kebab-case file found in the codebase.

Phase 5v: OpenAPI Response Examples (TD-020)

Implementation Summary

Already present in DTOs. Verified that @ApiProperty decorators include example values.

Verified Files

  • apps/api/src/orders/dto/order.dto.ts - Comprehensive examples

Phase 5w: Test Fixtures Centralization (TD-021)

Implementation Summary

Created centralized testing library with reusable fixtures.

Files Created

libs/testing/src/fixtures/order.fixtures.ts
libs/testing/src/fixtures/shipment.fixtures.ts
libs/testing/src/fixtures/print-job.fixtures.ts
libs/testing/src/fixtures/index.ts
libs/testing/src/index.ts

Usage

import { createMockOrder, createMockShipment } from '@forma3d/testing';

const order = createMockOrder({ status: 'PROCESSING' });
const shipment = createMockShipment({ carrierName: 'DHL' });

Summary Statistics

Metric Value
Files Created ~20
Files Modified ~15
Files Deleted 6
Test Count Before 414
Test Count After 436
New Test Files 2
New Libraries 1 (@forma3d/testing)

Recommendations for Future Work

  1. Migrate existing tests to use @forma3d/testing fixtures: Replace inline mock data with centralized fixtures for consistency.

  2. Add Redis storage for rate limiting: For horizontal scaling, implement distributed rate limiting with Redis.

  3. Enable noUnusedLocals in strict mode: Gradually enable stricter TypeScript checking.

  4. Replace remaining Record<string, unknown>: Adopt the new metadata schemas in services that currently use generic records.

  5. Add ESLint file naming rule: Enforce kebab-case with eslint-plugin-filenames.

Commits

  1. fix(api-e2e): remove eslint-disable comments from test setup files (TD-010)
  2. chore(web): remove unused nx-welcome component and scaffolding (TD-011)
  3. feat(api): implement rate limiting with @nestjs/throttler (TD-012)
  4. feat(api): configure database connection pool settings (TD-013)
  5. feat(api): add API versioning headers to all responses (TD-014)
  6. test(api): add comprehensive shipments service and controller tests (TD-015)
  7. feat(domain): add typed metadata schemas for orders and print jobs (TD-016)
  8. chore(web): remove unnecessary React fragment in router (TD-018)
  9. chore(web): rename ErrorBoundary to kebab-case naming (TD-019)
  10. feat(testing): create centralized test fixtures library (TD-021)