docs: def release(self):
          """
          Release the lock.
          """
          query = 'DELETE FROM {cf} WHERE "lockId"=:lockId AND "claimId"=:claimId;'
          d = self._client.execute(query.format(cf=self._lock_table),
                                   {'lockId': self._lock_id, 'claimId': self._claim_id},
                                   ConsistencyLevel.QUORUM)
  
          def _log_release_time(result):
              if self._log and self._lock_acquired_seconds is not None:
                  seconds = self._reactor.seconds() - self._lock_acquired_seconds
                  self._log.msg('Released lock. Was held for {0} seconds'.format(seconds),
                                lock_held_time=seconds, result=result, **self._log_kwargs)
              return result
  
          return d.addBoth(_log_release_time)