buzz/migrations/0033_section_workspace_projection_fts.sql

-- Kinds 9050 and 30623 carry owner-private section workspace migration state. Keep it
-- out of full-text search at the storage boundary while preserving the expression
-- installed by fresh or brownfield databases.
DO $$
DECLARE existing_expression TEXT;
BEGIN
    SELECT pg_get_expr(d.adbin, d.adrelid) INTO existing_expression
      FROM pg_attrdef d JOIN pg_attribute a
        ON a.attrelid = d.adrelid AND a.attnum = d.adnum
     WHERE d.adrelid = 'events'::regclass AND a.attname = 'search_tsv';
    IF existing_expression IS NULL THEN
        RAISE EXCEPTION 'events.search_tsv generated expression not found';
    END IF;
    ALTER TABLE events DROP COLUMN search_tsv;
    EXECUTE format(
        'ALTER TABLE events ADD COLUMN search_tsv TSVECTOR GENERATED ALWAYS AS (CASE WHEN kind IN (9050, 30623) THEN NULL::tsvector ELSE (%s) END) STORED',
        existing_expression
    );
    CREATE INDEX idx_events_search_tsv ON events USING GIN (search_tsv);
END $$;