text: CREATE TABLE room_features(
  id SERIAL,
  feature_id integer    null,
  room_id integer    null,
  PRIMARY KEY (id),
  CONSTRAINT room_features_rooms_id_fk
  FOREIGN KEY (room_id) REFERENCES rooms (id),
   CONSTRAINT room_features_features_id_fk
  FOREIGN KEY (feature_id) REFERENCES features (id)
  );
  