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Two root-cause bugs causing the reported issues:
1. Tracker never sent ISS positions: _start_satellite_tracker fell back
to sat_name.replace(' ', '-').upper() as the TLE cache key when the
DB entry had null TLE lines. For 'ISS (ZARYA)' this produced
'ISS-(ZARYA)' which has no matching entry in _tle_cache (keyed as
'ISS'). ISS was silently skipped every loop tick, so no SSE positions
were ever emitted and the map marker never moved.
Fix: try _BUILTIN_NORAD_TO_KEY.get(norad_int) first before the
name-derived fallback so the NORAD-to-key mapping is always used.
2. Stale TLE pass prediction results were cached: if startup TLEs were
too old for Skyfield to find events in the 48h window, the empty
passes list was cached for 300s. A page refresh within that window
re-served the empty result, showing 'NO PASSES FOUND' persistently.
Fix: only cache non-empty pass results so the next request
recomputes once the TLE auto-refresh has populated fresh data.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>