3bdc6ff1c9
## Security Enhancements (P0) - Add input validation with max_length and numeric range constraints - Implement WebSocket token authentication via first message - Add path traversal prevention in file storage service ## Permission Enhancements (P0) - Add project member management for cross-department access - Implement is_department_manager flag for workload visibility ## Cycle Detection (P0) - Add DFS-based cycle detection for task dependencies - Add formula field circular reference detection - Display user-friendly cycle path visualization ## Concurrency & Reliability (P1) - Implement optimistic locking with version field (409 Conflict on mismatch) - Add trigger retry mechanism with exponential backoff (1s, 2s, 4s) - Implement cascade restore for soft-deleted tasks ## Rate Limiting (P1) - Add tiered rate limits: standard (60/min), sensitive (20/min), heavy (5/min) - Apply rate limits to tasks, reports, attachments, and comments ## Frontend Improvements (P1) - Add responsive sidebar with hamburger menu for mobile - Improve touch-friendly UI with proper tap target sizes - Complete i18n translations for all components ## Backend Reliability (P2) - Configure database connection pool (size=10, overflow=20) - Add Redis fallback mechanism with message queue - Add blocker check before task deletion ## API Enhancements (P3) - Add standardized response wrapper utility - Add /health/ready and /health/live endpoints - Implement project templates with status/field copying ## Tests Added - test_input_validation.py - Schema and path traversal tests - test_concurrency_reliability.py - Optimistic locking and retry tests - test_backend_reliability.py - Connection pool and Redis tests - test_api_enhancements.py - Health check and template tests Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Tasks: Expand Rate Limiting
1. Configuration
- 1.1 Define rate limit tiers in config (standard, sensitive, heavy)
- 1.2 Standard: 60/minute, Sensitive: 20/minute, Heavy: 5/minute
- 1.3 Add environment variable overrides for rate limits
2. Task API Rate Limiting
- 2.1 Apply "standard" rate limit to POST /api/tasks
- 2.2 Apply "standard" rate limit to PATCH /api/tasks/{id}
- 2.3 Apply "heavy" rate limit to bulk task operations
3. Report API Rate Limiting
- 3.1 Apply "heavy" rate limit to POST /api/reports/generate
- 3.2 Apply "sensitive" rate limit to report export endpoints
4. Other Sensitive Endpoints
- 4.1 Apply "sensitive" rate limit to password change endpoint (N/A - uses external auth)
- 4.2 Apply "sensitive" rate limit to attachment upload
- 4.3 Apply "standard" rate limit to comment creation
5. Response Headers
- 5.1 Include X-RateLimit-Limit header in responses
- 5.2 Include X-RateLimit-Remaining header
- 5.3 Include X-RateLimit-Reset header
6. Testing
- 6.1 Test rate limit enforcement
- 6.2 Test rate limit reset after window
- 6.3 Verify 429 Too Many Requests response