# TaskFlow Production Features - v0.23.0
**Goal**: Transform TaskFlow from a demo API into a production-ready application that validates all Windjammer features under real load.
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## 🎯 Features to Implement
### 1. Authentication & Authorization ✅ (Partially exists)
**Current State**: Basic JWT auth exists
**Enhancements Needed**:
- [x] JWT token generation (exists)
- [x] JWT token verification (exists)
- [ ] Token refresh endpoint
- [ ] Role-based access control (RBAC)
- [ ] API key authentication
- [ ] Rate limiting per user/API key
- [ ] Session management
**New Endpoints**:
- `POST /api/v1/auth/refresh` - Refresh access token
- `POST /api/v1/auth/api-keys` - Generate API key
- `DELETE /api/v1/auth/api-keys/:id` - Revoke API key
- `GET /api/v1/auth/sessions` - List active sessions
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### 2. Pagination & Filtering
**Current State**: Basic list endpoints exist
**Enhancements Needed**:
- [ ] Cursor-based pagination
- [ ] Field filtering (`?fields=id,name,created_at`)
- [ ] Sorting (`?sort=-created_at,name`)
- [ ] Full-text search
- [ ] Date range filtering
- [ ] Status filtering
**Updated Endpoints**:
- `GET /api/v1/tasks?cursor=xxx&limit=50&fields=id,title&sort=-created_at`
- `GET /api/v1/tasks/search?q=urgent&status=open&created_after=2025-01-01`
- `GET /api/v1/projects?sort=name&limit=20`
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### 3. Advanced Features
#### 3.1 File Uploads
- [ ] Task attachments (images, documents)
- [ ] Multipart form data handling
- [ ] File validation (size, type)
- [ ] Storage (local filesystem or S3-compatible)
- [ ] Thumbnail generation for images
**New Endpoints**:
- `POST /api/v1/tasks/:id/attachments` - Upload file
- `GET /api/v1/tasks/:id/attachments` - List attachments
- `GET /api/v1/attachments/:id/download` - Download file
- `DELETE /api/v1/attachments/:id` - Delete attachment
#### 3.2 Real-time Notifications (WebSocket)
- [ ] WebSocket connection endpoint
- [ ] Task created/updated/deleted events
- [ ] Project member added/removed events
- [ ] Comment notifications
- [ ] Presence (who's online)
**New Endpoints**:
- `WS /api/v1/ws` - WebSocket connection
- Events: `task.created`, `task.updated`, `task.deleted`, `user.online`, `user.offline`
#### 3.3 Audit Logging
- [ ] Log all API actions
- [ ] Store user, action, timestamp, IP
- [ ] Queryable audit log
- [ ] Retention policy
**New Endpoints**:
- `GET /api/v1/audit-log?user_id=X&action=task.delete&from=date&to=date`
#### 3.4 Soft Deletes
- [ ] Mark records as deleted instead of removing
- [ ] Filter out deleted records by default
- [ ] Restore deleted records
- [ ] Permanent delete after retention period
**Updated Behavior**:
- All DELETE endpoints do soft delete
- Add `?include_deleted=true` query param
- Add `POST /api/v1/tasks/:id/restore` endpoint
#### 3.5 Bulk Operations
- [ ] Bulk create tasks
- [ ] Bulk update tasks (status, assignee)
- [ ] Bulk delete tasks
- [ ] Bulk assign to project
**New Endpoints**:
- `POST /api/v1/tasks/bulk` - Create multiple tasks
- `PATCH /api/v1/tasks/bulk` - Update multiple tasks
- `DELETE /api/v1/tasks/bulk` - Delete multiple tasks
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### 4. Production Concerns
#### 4.1 Request Tracing
- [ ] Generate unique request ID
- [ ] Include in all logs
- [ ] Return in response headers (`X-Request-ID`)
- [ ] Trace across service boundaries
#### 4.2 Structured Logging
- [ ] JSON-formatted logs
- [ ] Log levels (debug, info, warn, error)
- [ ] Contextual information (user_id, request_id, endpoint)
- [ ] Performance metrics (duration, status code)
#### 4.3 Metrics (Prometheus)
- [ ] Request count by endpoint
- [ ] Request duration histogram
- [ ] Error rate
- [ ] Active connections
- [ ] Database query duration
**New Endpoint**:
- `GET /metrics` - Prometheus metrics
#### 4.4 Health Checks
- [ ] Liveness probe (is server running?)
- [ ] Readiness probe (can server handle requests?)
- [ ] Dependency checks (database, redis)
- [ ] Detailed health status
**Enhanced Endpoint**:
- `GET /health` - Basic health (exists)
- `GET /health/live` - Liveness probe
- `GET /health/ready` - Readiness probe
- `GET /health/detailed` - Full health status
#### 4.5 Graceful Shutdown
- [ ] Handle SIGTERM/SIGINT
- [ ] Stop accepting new connections
- [ ] Wait for in-flight requests to complete
- [ ] Close database connections
- [ ] Timeout after 30s
#### 4.6 Rate Limiting
- [ ] Per-user rate limits
- [ ] Per-IP rate limits
- [ ] Per-endpoint rate limits
- [ ] Redis-backed (distributed)
- [ ] Return `429 Too Many Requests` with `Retry-After` header
**Implementation**:
- Token bucket algorithm
- Configurable limits (e.g., 100 req/min per user)
- Whitelist for admin users
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## 📁 New Files to Create
### Database Migrations
- `migrations/002_add_roles.sql` - RBAC tables
- `migrations/003_add_api_keys.sql` - API key authentication
- `migrations/004_add_audit_log.sql` - Audit logging
- `migrations/005_add_soft_deletes.sql` - Soft delete columns
- `migrations/006_add_attachments.sql` - File attachments
### Models
- `models/role.wj` - User roles
- `models/api_key.wj` - API key model
- `models/audit_log.wj` - Audit log entry
- `models/attachment.wj` - File attachment
- `models/notification.wj` - Real-time notification
### Handlers
- `handlers/attachments.wj` - File upload/download
- `handlers/audit.wj` - Audit log queries
- `handlers/websocket.wj` - WebSocket connections
- `handlers/metrics.wj` - Prometheus metrics
### Middleware
- `middleware/auth.wj` - Authentication middleware
- `middleware/rate_limit.wj` - Rate limiting
- `middleware/request_id.wj` - Request ID generation
- `middleware/logging.wj` - Structured logging
- `middleware/metrics.wj` - Metrics collection
### Utilities
- `utils/pagination.wj` - Cursor-based pagination
- `utils/filtering.wj` - Query filtering
- `utils/sorting.wj` - Result sorting
- `utils/storage.wj` - File storage abstraction
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## 🧪 Testing Strategy
### Load Testing
- **Tool**: `wrk` or `k6`
- **Scenarios**:
- 10,000 req/s sustained
- 100,000 concurrent connections (WebSocket)
- 1M tasks in database
- Complex queries with joins
### Stress Testing
- Gradually increase load until failure
- Identify bottlenecks
- Measure recovery time
### Endurance Testing
- Run at 80% capacity for 24 hours
- Monitor for memory leaks
- Check for connection leaks
- Verify log rotation
### Chaos Testing
- Kill database connection
- Simulate network latency
- Corrupt data
- Verify graceful degradation
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## 📊 Success Metrics
### Performance
- ✅ 10,000+ req/s throughput
- ✅ < 10ms p50 latency
- ✅ < 50ms p99 latency
- ✅ < 100ms p99.9 latency
### Reliability
- ✅ 99.9% uptime
- ✅ Zero memory leaks over 24h
- ✅ Graceful degradation under load
- ✅ Fast recovery from failures
### Developer Experience
- ✅ Clear error messages
- ✅ Comprehensive logging
- ✅ Easy to debug
- ✅ Well-documented APIs
### Code Quality
- ✅ All optimizations applied correctly
- ✅ Generated Rust code is idiomatic
- ✅ No clippy warnings
- ✅ 100% test coverage for critical paths
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## 🚀 Implementation Plan
### Phase 1: Core Enhancements (Week 1)
1. Token refresh endpoint
2. Role-based access control
3. Pagination (cursor-based)
4. Filtering and sorting
5. Request ID tracing
6. Structured logging
### Phase 2: Advanced Features (Week 2)
1. File uploads (attachments)
2. Soft deletes
3. Bulk operations
4. Audit logging
5. Rate limiting
### Phase 3: Real-time & Monitoring (Week 3)
1. WebSocket support
2. Real-time notifications
3. Prometheus metrics
4. Enhanced health checks
5. Graceful shutdown
### Phase 4: Testing & Optimization (Week 4)
1. Load testing
2. Stress testing
3. Profile generated code
4. Optimize hot paths
5. Document learnings
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## 📝 Documentation to Create
1. **API Documentation**: Complete OpenAPI/Swagger spec
2. **Deployment Guide**: Docker, Kubernetes, systemd
3. **Performance Tuning**: Configuration recommendations
4. **Monitoring Guide**: Metrics, logs, alerts
5. **Security Best Practices**: Auth, rate limiting, input validation
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*Created: October 12, 2025*
*Status: Planning Complete - Ready to Implement*