code: def delete_key(self, key):
      self.client.delete(key)
      self.client.hdel(self.category, key)
  
imports: import os
  import time
  from abc import ABC
  from pathlib import Path
  import hashlib
  import typing
  import pandas
  import walrus
  from mindsdb.utilities.config import Config
  from mindsdb.utilities.json_encoder import CustomJSONEncoder
  from mindsdb.interfaces.storage.fs import FileLock
  from mindsdb.utilities.context import context
label_desc: Use image node_id 7 for calling the RedisCache obj's underlying member method code with example usage: obj.delete_key(key) without return types