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  `visitor_ip` varchar(45) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '' COMMENT '访客 IP',
  `user_agent` varchar(500) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '' COMMENT '浏览器 UA',
  `is_read` tinyint(1) NOT NULL DEFAULT '0' COMMENT '是否已读（admin 端标记）',
  `created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_created` (`created_at`),
  KEY `idx_read` (`is_read`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='表单提交记录';
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