- uvicorn --log-config (log_config.json): timestamped formatters for uvicorn
access/error and the app's own "subfeed" loggers (ms precision)
- Log key activity: startup/shutdown, login/denied, token refresh, YouTube API
errors, subscription imports, sync pause/resume
- Background sync jobs no longer swallow errors silently — failures in RSS poll,
backfill, enrichment, autotag and resync are logged with tracebacks
