-- Additive: distinguish explicit V5 billing choices without changing legacy approval defaults.
-- Expand the existing source check; preserve its expression and all historical rows.
DO $$
DECLARE existing_expression TEXT;
BEGIN
    SELECT pg_get_expr(conbin, conrelid) INTO existing_expression
    FROM pg_constraint
    WHERE conrelid = 'tmodule_times'::regclass AND conname = 'tmodule_times_kilde_check';
    IF existing_expression IS NULL THEN
        existing_expression := 'kilde IN (''auto'', ''manuel'', ''api'')';
    END IF;
    IF POSITION('sag_v5' IN existing_expression) = 0 THEN
        ALTER TABLE tmodule_times DROP CONSTRAINT IF EXISTS tmodule_times_kilde_check;
        EXECUTE FORMAT('ALTER TABLE tmodule_times ADD CONSTRAINT tmodule_times_kilde_check CHECK ((%s) OR kilde = %L)', existing_expression, 'sag_v5');
    END IF;
END $$;