The Postgres answer to WowPlatter's sluggish rigid search. Was ILIKE '%..%' → Seq Scan (3038 cost),
zero typo tolerance, and multi-word phrases ('bob marley legend 2022') returned NOTHING (needs a
contiguous substring). Now: pg_trgm GIN index on disc_release.search_text (already populated) +
word_similarity operators — :q <% search_text (filter, GIN-accelerated) ranked by :q <<-> search_text.
Threshold pinned at 0.45 on the DB (recall vs speed sweet spot ~140ms; 0.3 too loose/slow, 0.6 too strict).
Added the missing disc_release_format(release_id) index (was seq-scanning per row) + inventory.title trgm
for stock-finder. All DDL idempotent in _STARTUP_DDL. Live: 'bob marly survivl' (2 typos) -> Survival in 117ms.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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