rules_audit.sql

CREATE OR REPLACE FUNCTION rules_audit() RETURNS TRIGGER
  LANGUAGE plpgsql
  AS $$
BEGIN

  IF (TG_OP = 'DELETE') THEN

    DELETE FROM user_rules  WHERE rule_id = OLD.id;
    DELETE FROM group_rules WHERE rule_id = OLD.id;

    RETURN OLD;

  ELSIF (TG_OP = 'UPDATE') THEN

    UPDATE user_rules
    SET action = NEW.action,
        mark   = NEW.mark
    WHERE rule_id = NEW.id;

    RETURN NEW;

  ELSIF (TG_OP = 'INSERT') THEN

    RETURN NEW;

  END IF;
  RAISE NOTICE 'DONE';
  RETURN NULL;

END;
$$;

CREATE TRIGGER rules_audit
AFTER INSERT OR UPDATE OR DELETE ON rules
FOR EACH ROW
EXECUTE PROCEDURE rules_audit();