21 lines
989 B
SQL
21 lines
989 B
SQL
-- OPERATOR NOTE: Adding a STORED generated column rewrites the entire
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-- media_items table under an ACCESS EXCLUSIVE lock. On a 219K-row
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-- production table this can take ~30s and blocks all reads and writes.
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-- Smaller blast radius than migration 104 (which is on the 1.4M-row
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-- media_files table), but still run during a maintenance window if possible.
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--
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-- Stored generated column matching the regex normalization currently
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-- inlined in catalog/item_repo.go Search() ranking expressions.
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-- Trigram-indexed so contiguous_title_match LIKE '%pattern%' uses an
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-- index instead of seq-scanning the tsvector candidate set
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-- (audit 2026-05-01 §3.12).
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ALTER TABLE public.media_items
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ADD COLUMN IF NOT EXISTS title_normalized text
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GENERATED ALWAYS AS (
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BTRIM(LOWER(REGEXP_REPLACE(COALESCE(title, ''), '[^[:alnum:]]+', ' ', 'g')))
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) STORED;
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CREATE INDEX IF NOT EXISTS idx_media_items_title_normalized_trgm
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ON public.media_items USING gin (title_normalized public.gin_trgm_ops);
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