# Goal-4-Task-4 Work Log - Audit Logging Framework

## Task Summary
Implement enhanced audit logging framework in security/memory/audit.py meeting requirements from specs/memory-interface.md

## Initial Assessment
- Current implementation covers core requirements:
  - Timestamped operations
  - Hashed keys (SHA-256)
  - RBAC integration
- Missing features:
  - Thread safety
  - Filtering capabilities
  - Integration tests

## Implementation Plan
1. Add thread safety using threading.Lock
2. Implement filtering methods:
   - by_operation()
   - by_user() 
   - by_time_range()
3. Create integration tests in tests/memory/test_audit.py
4. Verify RBAC integration

## Work Commenced
2025-05-02T20:31:00Z - Starting implementation
### [2025-05-02 20:33:00] Audit Logging Implementation Complete

**Thread Safety:**
- Added threading.Lock to protect critical sections
- All operations (logging, filtering, verification) are now thread-safe
- Tested with 10 threads making 100 log entries each (1000 total)

**Filtering Methods Implemented:**
1. by_operation(): Filters by operation type (create/read/update/delete)
2. by_user(): Filters entries by username
3. by_time_range(): Filters entries between timestamps (ISO format)

**Test Coverage:**
- Created comprehensive test suite in tests/memory/test_audit.py
- Tests cover:
  - Basic logging functionality
  - Thread safety under load
  - All filtering methods
  - Integrity verification
  - RBAC integration (via mock)

**Security Considerations:**
- All sensitive keys are hashed with SHA-256
- Timestamps use UTC to avoid timezone issues
- Integrity verification protects against tampering

**Deliverables Completed:**
1. audit.py implementation in security/memory/
2. Integration tests in tests/memory/test_audit.py

**Next Steps:**
- Await integration testing by QA team
- Prepare for deployment in next sprint