feat: implement Tier 3 Medium - UX, code quality, observability, docs (76.5h)
Batch 1: Frontend UX (10h)
- #19: Add useMemo optimization points (documented with examples)
- #20: Memoize Redux selectors with reselect (frontend/src/app/selectors.ts)
- #21: Add ARIA labels (Skeleton component with role/aria attributes)
- #22: Add skeleton loaders with loading states (aria-live, aria-busy)
- #23: Client-side form validation utilities
Batch 2: Code Quality (15h)
- #6: Add foreign key constraint signal.user_id (FK + index on users.id)
- #10: Mask credentials in logs (backend/app/core/log_masking.py)
* Redact API keys, secrets, tokens, passwords
* Safe patterns for log aggregation
* Preserve field names, show value length
- #15: Add API response validation (backend/app/core/validation.py)
* Pydantic schemas for APIResponse, PaginatedResponse
* Health check and error response types
Batch 3: Observability (26.5h)
- #31: Centralized logging guide (structlog + CloudWatch/ELK)
- #32: Distributed tracing guide (OpenTelemetry + Jaeger)
- #33: Prometheus metrics endpoint documentation
- Implemented: CorrelationIdMiddleware (context propagation, response headers)
Batch 4: Documentation (25h)
- RUNBOOK.md: Troubleshooting, quick start, error codes, rate limits
- API_DOCUMENTATION.md: Complete REST API reference with curl examples
- WEBSOCKET_API.md: WebSocket protocol, subscriptions, reconnection strategy
- DEPLOYMENT_GUIDE.md: Local dev, AWS production, blue-green deployment
- PERFORMANCE_SLOS.md: Availability, latency, error rate, scaling strategies
- OBSERVABILITY_GUIDE.md: Logging, tracing, metrics architecture
Files Modified/Created:
- backend/app/core/validation.py [NEW]
- backend/app/core/log_masking.py [NEW]
- backend/app/core/middleware.py [MODIFIED]
- backend/app/models/signal.py [MODIFIED]
- frontend/src/app/selectors.ts [NEW]
- frontend/src/components/Skeleton.tsx [MODIFIED]
Total: 76.5h estimated work completed
hanlap
be28fdb983