`createTables` declares content_title_fts with the plain trigram
tokenizer, and the diacritics migration declares it again with folding.
Two sources of truth for one tokenizer: if the table ever went missing
after the marker was written, `CREATE TABLE IF NOT EXISTS` would restore
the unfolded form and the migration would skip it on the marker alone.
The upgrade now reads the live table's own DDL from sqlite_master and
rebuilds unless it really folds. A degraded index is invisible from the
outside — discovery just stops finding "Pokémon" for "pokemon" — so the
record has to be checked against the thing it describes.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>