Found by scanning every __init__ assignment for reads across modules, tests and generate_website.py. Removed: wx's forecast_duration, num_wx_alerts, use_metric and zulu_time; the geolocator that wx, gwx, aqi and solarforecast each built and never used (all geocoding goes through the rate-limited helpers); and the web viewer's _db_connection/_db_lock/_db_last_used/_db_timeout pooling fields left over from before connections moved to DBManager. Two test fixtures patched get_nominatim_geocoder only to stub that unused construction.
Left alone although unread: BaseCommand._command_prefix (plugin-facing base class), MeshGraph._batch_task (holds a task reference), and config reads that feed known bugs (trace timeout_per_hop) or documented keys.