diff --git a/uniCloud/database/uni-im-group.schema.json b/uniCloud/database/uni-im-group.schema.json
index ca29df0c9c907e864e085f87bf6642e02c0f48fb..5c4db80d884b522c1e3bd2ee552a93bd69e38022 100644
--- a/uniCloud/database/uni-im-group.schema.json
+++ b/uniCloud/database/uni-im-group.schema.json
@@ -5,7 +5,7 @@
 	"required": ["name","join_option"],
 	"permission": {
 		"read": true,
-		"create": false,
+		"create": false, // 禁止前端调用，仅触发器内可用
 		"update": true, // 触发器内再处理
 		"delete": "auth.uid == doc.user_id"
 	},
@@ -19,10 +19,7 @@
     },
 		"user_id":{
 			"bsonType": "string",
-			"description": "群主id",
-			"forceDefaultValue":{
-				"$env":"uid"
-			}
+			"description": "群主id"
 		},
 		"name":{
 			"bsonType": "string",
@@ -81,6 +78,10 @@
       "bsonType": "bool",
       "description": "全群成员禁言",
       "defaultValue":false
+    },
+    "ext":{
+      "bsonType": "object",
+      "description": "自定义数据"
     }
 	}
 }
\ No newline at end of file