buzz/migrations/0048_desktop_stop_fts.sql

-- Owner-private Desktop Stop requests and results must not enter legacy ciphertext search indexes.
-- Like 0033, this rewrites events under ACCESS EXCLUSIVE; schedule accordingly.
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 (50180, 50181) THEN NULL::tsvector ELSE (%s) END) STORED',
        existing_expression
    );
    CREATE INDEX idx_events_search_tsv ON events USING GIN (search_tsv);
END $$;