CREATE TABLE IF NOT EXISTS `ai_chat_session` (
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`id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
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`memory_id` varchar(64) NOT NULL COMMENT '会话ID',
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`user_id` bigint NOT NULL COMMENT '用户ID',
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`tenant_id` bigint DEFAULT NULL COMMENT '租户ID',
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`title` varchar(128) DEFAULT NULL COMMENT '会话标题',
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`last_message` varchar(512) DEFAULT NULL COMMENT '最后一条消息',
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`message_count` int NOT NULL DEFAULT 0 COMMENT '消息数量',
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`last_chat_time` datetime DEFAULT NULL COMMENT '最后聊天时间',
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`create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
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`update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
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PRIMARY KEY (`id`),
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UNIQUE KEY `uk_ai_chat_session_memory_id` (`memory_id`),
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KEY `idx_ai_chat_session_user_tenant` (`user_id`, `tenant_id`),
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KEY `idx_ai_chat_session_last_chat_time` (`last_chat_time`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci COMMENT='AI历史会话元数据表';
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