def remove_session_id(self, sid):
        """
        Remove all references to a specific Session ID

        :param sid: A Session ID
        """
        for uid in self.get('sid2uid', sid):
            self.remove('uid2sid', uid, sid)
        self.delete('sid2uid', sid)

        for sub in self.get('sid2sub', sid):
            self.remove('sub2sid', sub, sid)
        self.delete('sid2sub', sid)