text: DROP TABLE B_IM_CHAT
  GO
  DROP TABLE B_IM_MESSAGE
  GO
  DROP TABLE B_IM_RELATION
  GO
  DROP TABLE B_IM_RECENT
  GO
  DROP TABLE B_IM_STATUS
  GO
  DROP TABLE B_IM_MESSAGE_PARAM
  GO
  DROP TABLE B_IM_BOT
  GO
  DROP TABLE B_IM_BOT_CHAT
  GO
  DROP TABLE B_IM_BOT_TOKEN
  GO
  DROP TABLE B_IM_COMMAND
  GO
  DROP TABLE B_IM_COMMAND_LANG
  GO
  DROP TABLE B_IM_ALIAS
  GO
  DROP TABLE B_IM_EXTERNAL_AVATAR
  GO