optimize_fts() and vacuum() already refuse to run against a quarantined
handle (_db_corrupt / _db_replaced / _db_wal_generation_lost): both would
rewrite index/file pages in place, turning contained, diagnosable
corruption into an amplified one. rebuild_fts() never got the same guard,
despite being the more destructive of the two ("discards and recreates the
index data entirely", per its own docstring, vs. optimize_fts's segment
merge).
It's also independently reachable outside _execute_write's own quarantine
check: gateway/session_transcript.py's _rebuild_fts_once() calls
db.rebuild_fts() directly from the FTS-corruption transcript-retry path,
with no quarantine check of its own (only a WAL split-brain / foreign-holder
check, a different concern). A quarantined handle hitting that retry path
would run a full FTS rebuild — and commit it — on a corrupt, replaced, or
split-WAL-generation file.
Add the same self._raise_if_db_corrupt()/self._raise_if_db_replaced() pair
optimize_fts() already has, at the top of rebuild_fts(), before it enters
the cross-process rebuild admission.
nftpoetrist
17b2768b86