@gen.coroutine
  def _CreateNotification(self, user_id, name, invalidate):
    # Create dummy operation.
    op_id = Operation.ConstructOperationId(Operation.ANONYMOUS_DEVICE_ID, 0)
    op = Operation(Operation.ANONYMOUS_USER_ID, op_id)
    op.device_id = Operation.ANONYMOUS_DEVICE_ID
    op.timestamp = util.GetCurrentTimestamp()

    yield Notification.CreateForUser(self._client,
                                     op,
                                     user_id,
                                     name,
                                     invalidate=invalidate)
Create notification in order to notify user's devices that
dataset/ETHPy150Open viewfinderco/viewfinder/backend/db/tools/dbchk.py/DatabaseChecker._CreateNotification