text: ALTER TABLE `user_conversation_state`
      DROP COLUMN `history`,
      ADD COLUMN `recording` boolean NOT NULL default false;
  
  DROP TABLE IF EXISTS `user_conversation_history`;
  /*!40101 SET @saved_cs_client     = @@character_set_client */;
  /*!40101 SET character_set_client = utf8 */;
  CREATE TABLE `user_conversation_history` (
    `userId` int(11) not NULL,
    `uniqueId` varchar(255) COLLATE utf8mb4_bin NOT NULL,
    `conversationId` varchar(255) COLLATE utf8mb4_bin NOT NULL,
    `messageId` int(11) NOT NULL,
    `message` text COLLATE utf8mb4_bin NOT NULL,
    PRIMARY KEY (`userId`, `uniqueId`),
    UNIQUE KEY (`userId`, `conversationId`, `messageId`)
  ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;
  /*!40101 SET character_set_client = @saved_cs_client */;
  