## 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: Input Length Validation
The system SHALL enforce maximum length limits on all user-provided string inputs to prevent DoS attacks and database overflow.
Scenario: Task title exceeds maximum length
- WHEN user submits a task with title longer than 500 characters
- THEN system returns 422 Validation Error with descriptive message
Scenario: Description field within limits
- WHEN user submits content with description under 10000 characters
- THEN system accepts the input and processes normally
Requirement: Secure WebSocket Authentication
The system SHALL authenticate WebSocket connections without exposing tokens in URL query parameters.
Scenario: WebSocket connection with token in first message
- WHEN client connects to WebSocket endpoint
- THEN server waits for authentication message containing JWT token
- THEN server validates token before accepting further messages
Scenario: WebSocket connection timeout without authentication
- WHEN client connects but does not send authentication within 10 seconds
- THEN server closes the connection with appropriate error code
Requirement: Path Traversal Protection
The system SHALL prevent file path traversal attacks by validating all file paths resolve within the designated storage directory.
Scenario: Path traversal attempt detected
- WHEN request contains file path with "../" or absolute path outside storage
- THEN system rejects request and logs security warning
- THEN system returns 403 Forbidden error
Scenario: Valid file path within storage
- WHEN request contains valid relative file path
- THEN system resolves path and verifies it is within storage directory
- THEN system processes file operation normally