diff --git a/app/Database/dbmsv4_init.sql b/app/Database/dbmsv4_init.sql
index 61c3645..f23a3e5 100644
--- a/app/Database/dbmsv4_init.sql
+++ b/app/Database/dbmsv4_init.sql
@@ -70,9 +70,9 @@ CREATE TABLE `boardinfo` (
   `title` varchar(255) NOT NULL,
   `content` text DEFAULT NULL,
   `status` varchar(20) NOT NULL DEFAULT 'available',
-  `updated_at` datetime DEFAULT NULL,
-  `created_at` datetime DEFAULT current_timestamp(),
-  `deleted_at` datetime DEFAULT NULL,
+  `updated_at` timestamp NULL DEFAULT NULL,
+  `created_at` timestamp NOT NULL DEFAULT current_timestamp(),
+  `deleted_at` timestamp NULL DEFAULT NULL,
   PRIMARY KEY (`uid`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_general_ci;
 /*!40101 SET character_set_client = @saved_cs_client */;
@@ -762,4 +762,4 @@ UNLOCK TABLES;
 /*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
 /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
 
--- Dump completed on 2025-12-23 10:12:24
+-- Dump completed on 2025-12-23 10:55:42
diff --git a/app/Database/dbmsv4_test1.sql b/app/Database/dbmsv4_test1.sql
index dd7798e..a2d9946 100644
--- a/app/Database/dbmsv4_test1.sql
+++ b/app/Database/dbmsv4_test1.sql
@@ -70,9 +70,9 @@ CREATE TABLE `boardinfo` (
   `title` varchar(255) NOT NULL,
   `content` text DEFAULT NULL,
   `status` varchar(20) NOT NULL DEFAULT 'available',
-  `updated_at` datetime DEFAULT NULL,
-  `created_at` datetime DEFAULT current_timestamp(),
-  `deleted_at` datetime DEFAULT NULL,
+  `updated_at` timestamp NULL DEFAULT NULL,
+  `created_at` timestamp NOT NULL DEFAULT current_timestamp(),
+  `deleted_at` timestamp NULL DEFAULT NULL,
   PRIMARY KEY (`uid`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_general_ci;
 /*!40101 SET character_set_client = @saved_cs_client */;
@@ -762,4 +762,4 @@ UNLOCK TABLES;
 /*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
 /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
 
--- Dump completed on 2025-12-23 10:12:15
+-- Dump completed on 2025-12-23 10:55:34