diff --git a/pkg/common/db/unrelation/mongo.go b/pkg/common/db/unrelation/mongo.go
index fc98b85eb..6f384417b 100644
--- a/pkg/common/db/unrelation/mongo.go
+++ b/pkg/common/db/unrelation/mongo.go
@@ -99,7 +99,7 @@ func (m *Mongo) createMongoIndex(collection string, isUnique bool, keys ...strin
 	index := mongo.IndexModel{
 		Keys: keysDoc,
 	}
-	if isUnique == true {
+	if isUnique {
 		index.Options = options.Index().SetUnique(true)
 	}
 	result, err := indexView.CreateOne(
diff --git a/pkg/proto/msg/msg.proto b/pkg/proto/msg/msg.proto
index c38a6113c..28b3e3cb1 100644
--- a/pkg/proto/msg/msg.proto
+++ b/pkg/proto/msg/msg.proto
@@ -167,6 +167,11 @@ message RevokeMsgReq {
 message RevokeMsgResp {
 }
 
+message DeleteSyncOpt {
+  bool IsSyncSelf = 3;
+  bool IsSyncOther = 4;
+}
+
 message ClearConversationsMsgReq {
   repeated string conversationIDs = 1;
   string userID = 2;