-- set generic with date and uid combined
-- don't use with set_generic/set_uid together

CREATE OR REPLACE FUNCTION set_generic() RETURNS TRIGGER AS '
	DECLARE
		random_length INT = 32; -- long for massive data
	BEGIN
		IF TG_OP = ''INSERT'' THEN
			NEW.date_created := ''now'';
			IF NEW.uid IS NULL THEN
				NEW.uid := random_string(random_length);
			END IF;
		ELSIF TG_OP = ''UPDATE'' THEN
			NEW.date_updated := ''now'';
		END IF;
		RETURN NEW;
	END;
' LANGUAGE 'plpgsql';