## 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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ADDED Requirements
Requirement: Storage Path Validation
The system SHALL validate file storage configuration on startup to ensure reliability.
Scenario: Valid NAS storage path
- WHEN application starts with valid UPLOAD_DIR configuration
- THEN system verifies path exists and is writable
- THEN system logs confirmation of storage configuration
Scenario: Invalid storage path
- WHEN application starts with invalid or inaccessible UPLOAD_DIR
- THEN system logs error with specific issue (not found, not writable)
- THEN system falls back to local storage with warning
Scenario: Storage health check
- WHEN health check endpoint is called
- THEN response includes storage availability status
- THEN response includes available disk space if accessible
Requirement: Notification Delivery Reliability
The system SHALL ensure notification delivery even during temporary Redis failures.
Scenario: Redis temporarily unavailable
- WHEN Redis publish fails due to connection error
- THEN system queues message in local memory
- WHEN Redis connection recovers
- THEN system retries queued messages
Scenario: Queue overflow prevention
- WHEN local message queue exceeds maximum size
- THEN oldest messages are dropped
- THEN system logs warning about dropped messages
Requirement: Task Deletion Safety
The system SHALL warn users when deleting tasks with unresolved blockers.
Scenario: Delete task with active blockers
- WHEN user attempts to delete task with unresolved blockers
- THEN system returns warning with blocker count
- THEN user must confirm or use force_delete flag
Scenario: Force delete with blockers
- WHEN user force deletes task with blockers
- THEN system auto-resolves all blockers with "task deleted" reason
- THEN system proceeds with task deletion