-- Trigram-backed fuzzy search on mangas. The `%` operator becomes
-- index-supported once gin_trgm_ops is in place, so the search query
-- can mix substring matches (ILIKE) with fuzzy matches (similarity >
-- pg_trgm.similarity_threshold, default 0.3) without a full scan.

CREATE EXTENSION IF NOT EXISTS pg_trgm;

CREATE INDEX mangas_title_trgm_idx
    ON mangas USING gin (title gin_trgm_ops);

-- Author is nullable; index only the rows that have one so the index
-- stays tight.
CREATE INDEX mangas_author_trgm_idx
    ON mangas USING gin (author gin_trgm_ops)
    WHERE author IS NOT NULL;