pub trait Data {
    fn get_room_shortstatehash(room_id: &RoomId);
}

    /// Returns the last state hash key added to the db for the given room.
    #[tracing::instrument(skip(self))]
    pub fn current_shortstatehash(&self, room_id: &RoomId) -> Result<Option<u64>> {
        self.roomid_shortstatehash
            .get(room_id.as_bytes())?
            .map_or(Ok(None), |bytes| {
                Ok(Some(utils::u64_from_bytes(&bytes).map_err(|_| {
                    Error::bad_database("Invalid shortstatehash in roomid_shortstatehash")
                })?))
            })
    }