diff --git a/collection/opendb-msg/collection.json b/collection/opendb-msg/collection.json
index 5239889..ea82492 100644
--- a/collection/opendb-msg/collection.json
+++ b/collection/opendb-msg/collection.json
@@ -4,7 +4,7 @@
 		"required": ["to_uid", "body", "type"],
 		"permission": {
 			"read": "auth.uid == doc.to_uid",
-			"create": true,
+			"create": false,
 			"update": false,
 			"delete": false
 		},
@@ -13,6 +13,7 @@
 				"description": "ID，系统自动生成"
 			},
 			"from_uid": {
+				"bsonType": "string",
 				"description": "消息发送方 UserID（用于指定发送消息方帐号）",
 				"forceDefaultValue": {
 					"$env": "uid"
@@ -28,6 +29,7 @@
 				"forceDefaultValue": false
 			},
 			"create_date": {
+				"bsonType": "timestamp",
 				"description": "消息发送时间戳",
 				"forceDefaultValue": {
 					"$env": "now"