Merge pull request #3658 from withchao/pre-release-v3.8.4

fix: Mongo Malloc upsert overwrites min_seq initialization

pkg/common/storage/database/mgo/seq_conversation.go

@@ -58,7 +58,7 @@ func (s *seqConversationMongo) Malloc(ctx context.Context, conversationID string
 	filter := map[string]any{"conversation_id": conversationID}
 	update := map[string]any{
 		"$inc":         map[string]any{"max_seq": size},
-		"$set": map[string]any{"min_seq": int64(0)},
+		"$setOnInsert": map[string]any{"min_seq": int64(0)},
 	}
 	opt := options.FindOneAndUpdate().SetUpsert(true).SetReturnDocument(options.After).SetProjection(map[string]any{"_id": 0, "max_seq": 1})
 	lastSeq, err := mongoutil.FindOneAndUpdate[int64](ctx, s.coll, filter, update, opt)