code: def bind_to_channel(self):
          
          if self.channel.code_name != self.user.prv_exchange:
              channel = self._connect_mq()
              channel.exchange_bind(source=self.channel.code_name, destination=self.user.prv_exchange)
docs: Binds (subscribes) users private exchange to channel exchange
          Automatically called at creation of subscription record.