Modify DataStore.cleanup() to minimize lock hold duration:
- Snapshot timestamps under lock (brief O(1) list copy)
- Compute expired keys outside lock (no contention during O(n) scan)
- Re-acquire lock only for deletion with re-validation
(ensures entries refreshed between snapshot and deletion are not deleted)
This reduces blocking of reader threads and prevents latency spikes
during periodic cleanup of large stores (10K+ entries).
Also adds tests:
- test_cleanup_removes_expired_keeps_fresh: basic cleanup behavior
- test_cleanup_does_not_delete_refreshed_entry: re-validation guard
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Add __getitem__, __setitem__, and __delitem__ methods to DataStore
class to support dict-style subscript notation (store[key]).
Fixes TypeError: 'DataStore' object is not subscriptable
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Security:
- Add input validation for all API endpoints (frequency, lat/lon, device, gain, ppm)
- Add HTML escaping utility to prevent XSS attacks
- Add path traversal protection for log file configuration
- Add proper HTTP status codes for error responses (400, 409, 503)
Performance:
- Reduce SSE keepalive overhead (30s interval instead of 1s)
- Add centralized SSE stream utility with optimized keepalive
- Add DataStore class for thread-safe data with automatic cleanup
New Features:
- Add data export endpoints (/export/aircraft, /export/wifi, /export/bluetooth)
- Support for both JSON and CSV export formats
- Add process cleanup on application exit (atexit handlers)
- Label Iridium module as demo mode with clear warnings
Code Quality:
- Create utils/validation.py for centralized input validation
- Create utils/sse.py for SSE stream utilities
- Create utils/cleanup.py for memory management
- Add safe_terminate() and register_process() for process management
- Improve error handling with proper logging throughout routes
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
James Smith