wolf39us: "It keeps unauthenticating... daily" — re-auth fixes it until the
next day. Mechanism: spotipy's token cache was a loose FILE at
config/.spotify_cache. /app/config is a declared VOLUME, but a compose file
that doesn't map it explicitly gets an ANONYMOUS volume — recreated empty on
every container pull. So a nightly Watchtower update kept all his settings
(config lives in the database now) while silently dropping the OAuth tokens.
His redirect-URI change won't help: callback URLs only matter during the
initial handshake, never for refresh.
New DatabaseTokenCache (spotipy CacheHandler) stores the token payload in
the same database-backed config store as every other setting — tokens now
survive exactly as long as the rest of the configuration does. The legacy
file is imported once on upgrade (no forced re-auth) and removed on logout;
a failed cache write logs and never raises (spotipy calls it mid-request).
Tests: roundtrip, JSON-string tolerance, one-time legacy import (store wins
after the file vanishes), garbage file ignored, logout clears both stores,
write failure never raises. 204 spotify tests pass.
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