diff --git a/models/dm_model_call_fact.json b/models/dm_model_call_fact.json
index 45c973e..a1baa64 100644
--- a/models/dm_model_call_fact.json
+++ b/models/dm_model_call_fact.json
@@ -149,8 +149,7 @@
         {
             "name": "created_at",
             "title": "创建时间",
-            "type": "datetime",
-            "default": "NOW()"
+            "type": "timestamp"
         }
     ],
     "indexes": [