fix: cbc时间字段统一毫秒处理

build/database/std/install/cbc_message.sql

@@ -28,7 +28,7 @@ CREATE TABLE `cbc_message`  (
   `message_json` varchar(10240) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
   `status` enum('ACTIVE','INACTIVE') CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT 'INACTIVE',
   `detail` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
-  `created_at` bigint(20) NULL DEFAULT current_timestamp(),
+  `created_at` bigint(20) NULL DEFAULT NULL,
   `updated_at` bigint(20) NULL DEFAULT NULL,
   PRIMARY KEY (`id`) USING BTREE,
   INDEX `id`(`id`) USING BTREE,