Review follow-up (Codex): a `PlaylistsService` mutation that read the row
before `DB_SET_PLAYLIST_SERVER_TIMEZONE` landed and upserted afterwards
replaced the payload with its clockless snapshot. `DB_UPSERT_APP_PLAYLIST(S)`
now carry the STORED clock into a snapshot that has none while the row still
points at the same connection (`playlistConflictUpdate`, nested CASE so the
json_* readers never run on a malformed payload); a snapshot with its own
clock, or one that moves the source, wins as is. Real-SQLite coverage for
kept / moved / own-clock / batch rows.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>