code: def __del__(self):
      self.channel.close()
  
imports: import os
  import pickle
  import json
  import grpc
  from mindsdb.microservices_grpc.db import db_pb2_grpc
  from mindsdb.microservices_grpc.db import db_pb2, common_pb2
  from mindsdb.integrations.libs.response import HandlerStatusResponse, HandlerResponse
  from mindsdb.integrations.libs.handler_helpers import action_logger
  from mindsdb.utilities.context import context
  from mindsdb.utilities import log
label_desc: Use image node_id 2 for calling the DBClientGRPC obj's underlying member method code with example usage: obj.__del__() without return types