conversation_chunks_fts is a standalone FTS5 table (no content= option).
The old INSERT ... VALUES('rebuild') is a no-op on standalone tables and
left deleted chunks searchable in the FTS shadow tables.
Fix: collect IDs before deletion, explicitly DELETE FROM conversation_chunks_fts
WHERE rowid IN (...) before removing from the main table. This keeps FTS
in sync after every vacuum call.
Tests: 303/303 passing. Vacuum tests now pass for the right reason.
Patrick Plate
8f24168dcd