persistable sclass TickerSequences is IntSize {
  settable S market; // e.g. "TRBUSDT"
  
  new L<TickerSequence> tickers;
  
  void add(TickerSequence ticker) {
    tickers.add(ticker);
  }
  
  TickerSequence get(int i) { ret tickers.get(i); }
  
  void sort {
    sortInPlaceByCalculatedField(tickers, ->. startTime());
  }
  
  public int size() { ret tickers.size(); }
  
  toString {
    ret commaCombine(
      spaceCombine(
        n2(tickers, " ticker sequence"),
        empty(market) ? null : "for " + market),
        "total time: " + formatDouble1(toDays(totalTime())) + " days");
  }
  
  long totalTime() {
    ret longSum(map(tickers, ticker -> ticker.timeRange().length()));
  }
  
  void merge(double maximumGapSeconds default 120) {
    sort();
    
    for (int i = 0; i+1 < l(tickers); i++) {
      var t1 = tickers.get(i);
      var t2 = tickers.get(i+1);
      if (t2.startTime()-t1.endTime() <= fromSeconds(maximumGapSeconds)) {
        t1.add(t2);
        tickers.remove(i+1);
      }
    }
  }
}