Fix exception handling in _clean_redis_keys() and stop_channel()
where `except Channel.DoesNotExist` didn't catch ValidationError from invalid UUID format, bypassing the Stream fallback path.
All 12 call sites for Channel.release_stream() and Stream.release_stream() now check the boolean return value and log warnings when release fails.
Files updated:
- server.py: 4 call sites (zombie cleanup + _clean_redis_keys)
- channel_service.py: 2 call sites (stop_channel)
- stream_generator.py: 1 call site (last client disconnect)
- views.py: 4 call sites (failed init, redirect, init failure, exception)
- url_utils.py: 1 call site (URL generation error)
Also fixed bare except clause in _clean_redis_keys and uncaught
Stream.DoesNotExist in channel_service.stop_channel.
Based on PR #838 by patchy8736
System Event Logging:
- Add SystemEvent model with 15 event types tracking channel operations, client connections, M3U/EPG activities, and buffering events
- Log detailed metrics for M3U/EPG refresh operations (streams/programs created/updated/deleted)
- Track M3U/EPG downloads with client information (IP address, user agent, profile, channel count)
- Record channel lifecycle events (start, stop, reconnect) with stream and client details
- Monitor client connections/disconnections and buffering events with stream metadata
Event Viewer UI:
- Add SystemEvents component with real-time updates via WebSocket
- Implement pagination, filtering by event type, and configurable auto-refresh
- Display events with color-coded badges and type-specific icons
- Integrate event viewer into Stats page with modal display
- Add event management settings (retention period, refresh rate)
M3U/EPG Endpoint Optimizations:
- Implement content caching with 5-minute TTL to reduce duplicate processing
- Add client-based event deduplication (2-second window) using IP and user agent hashing
- Support HEAD requests for efficient preflight checks
- Cache streamed EPG responses while maintaining streaming behavior for first request
