Werkzeug's dev server buffers SSE response headers until the first body byte
is written. With keepalive_interval=30s, opening two SSE connections on
DOMContentLoaded (satellite stream + new ground station stream) meant the
browser waited 30 seconds before receiving any response bytes from either
connection. Browsers keep their loading indicator active while connections are
pending, causing the satellite dashboard to appear stuck loading.
Fix: yield an immediate keepalive at the start of sse_stream_fanout so every
SSE endpoint flushes headers + first data to the browser instantly.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Fix SSE fanout thread AttributeError when source queue is None during
interpreter shutdown by snapshotting to local variable with null guard
- Fix branded "i" logo rendering oversized on first page load (FOUC) by
adding inline width/height to SVG elements across 10 templates
- Bump version to 2.26.0 in config.py, pyproject.toml, and CHANGELOG.md
Co-Authored-By: Claude Opus 4.6 <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>
