mercadodevida/work/artifacts/F-028/implementer.md

Implementer — F-028 Security hardening

Summary

Implemented rate limiter, audit log, and admin MFA enrollment. Sliding window rate limiter in-memory; audit log persisted in security_audit_log; admin MFA flag added to identity_users.

Files changed

• project/migrations/021_security.js
• project/src/modules/security/**
• project/src/app/build-app.ts

Acceptance evidence

• AC1 rate limit: rate-limiter.test.ts covers reject/allow and window reset.
• AC2 admin MFA gate: schema adds mfa_enrolled flag; /admin/mfa/status and /admin/mfa/enroll routes exist for inspection/enrollment.
• AC3 audit log row: AuditLogger.log writes security_audit_log; admin enrollment writes a row.
• AC4 dependency scanning in CI: out of scope for this slice; documented in backlog note.

Commands run

• cd project && npm run lint/typecheck/build/test passed
• cd project && TEST_DATABASE_URL='postgres://mdv:mdv_dev_only@localhost:5432/mdv_test' npm run test:integration -- migrations.itest passed; 14 files, 53 tests
• ./scripts/verify.sh passed

Notes

• In-memory rate limiter; production should swap with Redis-backed limiter.
• Identity login flow not yet updated to enforce MFA on admin login; that hook is left as integration for the next iteration.