# Module 2 Implementation Report - Backend API Foundation

## PHASE

Phase 2 - Architecture Stabilization / Backend API Foundation

## STATUS

In Progress

## FILES REVIEWED

- `production-readiness/08-full-system-production-audit.md`
- `production-readiness/module-01-database/prisma/schema.prisma`
- `production-readiness/module-01-database/scripts/verify-database-module.js`
- `production-readiness/03-api-contract.md`
- `production-readiness/04-security-rbac-plan.md`
- `subhakamana-store-final-erp-platform.html`
- `subhakamana-store-physical-pos.html`
- `subhakamana-store-ecommerce.html`

## CHANGES MADE

- Created `production-readiness/module-02-api-foundation/`.
- Added dependency-free backend starter package.
- Added health endpoint server logic.
- Added centralized configuration loading.
- Added centralized success/error response format.
- Added initial backend RBAC permission map.
- Added idempotency key validation.
- Added inventory safety rules to prevent overselling.
- Added Node test suite.
- Updated root and production-readiness README files.
- Fixed Module 1 verification script path handling for repository folders with spaces.

## TESTS RUN

- `node production-readiness/module-01-database/scripts/verify-database-module.js` - Passed.
- `node --test test/*.test.js` inside `production-readiness/module-02-api-foundation` - Passed, 5 tests.
- Local HTTP listen smoke test - Blocked by sandbox with `EPERM`; not counted as passed.

## ISSUES FOUND

### P0

- No live backend API is connected to the ERP, POS, or website yet.
- No real authentication or server-side RBAC is active yet.
- Inventory transactions are not yet backed by PostgreSQL locks/transactions in live runtime code.

### P1

- Module 2 needs real auth endpoints, password hashing, session persistence, and Prisma integration.
- API routes must be connected to the Module 1 Prisma schema.
- Frontend migration must happen one workflow at a time to avoid breaking the prototype.

### P2

- Add OpenAPI documentation or generated API reference.
- Add API request validation schemas.
- Add CI command that runs Module 1 and Module 2 verification together.

### P3

- Add Docker compose for local PostgreSQL after the backend module is ready.

## RISKS

- Starting server integration before authentication and inventory rules are stable could create insecure demo endpoints.
- Leaving frontend and backend sources of truth active at the same time can create inconsistent data during migration.

## NEXT ACTION

Implement secure authentication service and session storage using Prisma-backed users, Argon2 or bcrypt password hashing, login rate limiting, logout, session revocation, and permission middleware.