by Robin at 20240308，up op refreshes bottom flag

app/mix/service/utilservice.go

@@ -720,9 +720,15 @@ func (s *Service) utilGetUpUserVisitOffset(ctx *gin.Context, mid int64, recommli
 		return nil, qmgo.ErrNoSuchDocuments
 	} else {
 		nowoffset := (uservisitoffset.StreamerRecommOffset + consts.StreamerRecommThroughput) % recommlistLength
+		// 向上操作固定清掉触底标志
+		var bottomFlagPtr *int64 = nil
+		if uservisitoffset.GetBottomFlag() == 1 {
+			bottomFlagPtr = goproto.Int64(0)
+		}
 		err = _DefaultUserVisitOffset.OpUpdate(ctx, &dbstruct.UserVisitOffset{
 			Id:                   uservisitoffset.Id,
 			StreamerRecommOffset: nowoffset,
+			BottomFlag:           bottomFlagPtr,
 			Ver:                  uservisitoffset.Ver,
 		})
 		if err != nil {