message: use ticker for polling db in live tail.
diff: @@ -2907,6 +2907,8 @@ func (r *ClickHouseReader) TailLogs(ctx context.Context, client *model.LogsTailC
  idStart = client.Filter.IdStart
  }
  + ticker := time.NewTicker(time.Duration(r.liveTailRefreshSeconds) * time.Second)
  + defer ticker.Stop()
  for {
  select {
  case <-ctx.Done():
  @@ -2914,7 +2916,7 @@ func (r *ClickHouseReader) TailLogs(ctx context.Context, client *model.LogsTailC
  client.Done <- &done
  zap.S().Debug("closing go routine : " + client.Name)
  return
  - default:
  + case <-ticker.C:
  // get the new 100 logs as anything more older won't make sense
  tmpQuery := fmt.Sprintf("%s where timestamp >='%d'", query, tsStart)
  if filterSql != "" {
  @@ -2947,7 +2949,6 @@ func (r *ClickHouseReader) TailLogs(ctx context.Context, client *model.LogsTailC
  }
  }
  }
  - time.Sleep(time.Duration(r.liveTailRefreshSeconds) * time.Second)
  }
  }
  }
  