-- adds the created or updated date tags

CREATE OR REPLACE FUNCTION set_uid()
RETURNS TRIGGER AS
$$
DECLARE
    random_length INT = 32; -- that should be long enough
BEGIN
    IF TG_OP = 'INSERT' THEN
        NEW.uid := random_string(random_length);
    END IF;
    RETURN NEW;
END;
$$
LANGUAGE 'plpgsql';