fix: reserve seq for p2p system messages

server/store/store.go

@@ -3397,18 +3397,20 @@ func (messagesMapper) PreparePersist(tenantID types.TenantID, msg *types.Message
 	msg.InitTimes()
 	fromUid := types.ParseUid(msg.From)
 	isGroupMessage := types.GetTopicCat(msg.Topic) == types.TopicCatGrp
-	if isGroupMessage && groupMsgRuntime != nil {
+	if groupMsgRuntime != nil {
 		if clientMsgID != "" {
-			claim, claimed, err := groupMsgRuntime.Claim(tenantID, msg.Topic, fromUid, clientMsgID)
-			if err != nil {
-				return nil, err
-			}
-			if !claimed {
-				if claim != nil && claim.Status == "done" && claim.Seq > 0 {
-					msg.SeqId = claim.Seq
-					return &types.MessageSaveResult{SeqId: claim.Seq, Duplicate: true}, nil
+			if isGroupMessage {
+				claim, claimed, err := groupMsgRuntime.Claim(tenantID, msg.Topic, fromUid, clientMsgID)
+				if err != nil {
+					return nil, err
+				}
+				if !claimed {
+					if claim != nil && claim.Status == "done" && claim.Seq > 0 {
+						msg.SeqId = claim.Seq
+						return &types.MessageSaveResult{SeqId: claim.Seq, Duplicate: true}, nil
+					}
+					return nil, types.ErrDuplicate
 				}
-				return nil, types.ErrDuplicate
 			}
 		}
 		seq, shardMonth, err := nextMessageSeqWithFloor(tenantID, msg.Topic, msg.SeqId-1, msg.CreatedAt.UTC().Format("200601"))
@@ -3419,7 +3421,9 @@ func (messagesMapper) PreparePersist(tenantID types.TenantID, msg *types.Message
 			return nil, err
 		}
 		msg.SeqId = seq
-		msg.ShardMonth = shardMonth
+		if isGroupMessage {
+			msg.ShardMonth = shardMonth
+		}
 	}
 	if isGroupMessage && msg.ShardMonth == "" {
 		msg.ShardMonth = msg.CreatedAt.UTC().Format("200601")