An expired catalog made every /api/cctv request (camera list and frames)
wait for the full refresh, which lasts as long as the slowest of the live
packs: Tarktee's DATEX feeds took 2 to 16.6 s across ten requests. With
Tarktee's timeout raised to 30 s, that wait could reach 30 s at each
15-minute refresh. The cached list is now returned while a single-flight
refresh replaces it in the background; only a first load, with nothing
to serve, waits. A background refresh that throws is logged.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
