static S webChatBotLogsHTML() {
  ret withDBLock(func -> S {
    new L<S> l;
    for (Conversation conv : sortByCalculatedFieldDesc(list(Conversation), func(Conversation c) { empty(c.msgs) ? c.created : last(c.msgs).time })) {
      LL<Msg> dialogs = reversed(unnull(conv.oldDialogs));
      l.add(webChatBotLogsHTML_formatDialog(str(conv.id + "/" + (l(dialogs)+1)), conv.msgs));
      int i = l(dialogs);
      for (L<Msg> msgs : dialogs)
        l.add(webChatBotLogsHTML_formatDialog(conv.id + "/" + (i--), msgs));
    }
    ret h3_htitle("Chat Logs") + ul(l, null, style := "margin-top: 1em");
  });
}

sS webChatBotLogsHTML_formatDialog(S id, L<Msg> msgs) {
  long startTime = collectMinLong(msgs, 'time);
  long endTime = collectMaxLong(msgs, 'time);
  new L<S> lc;
  for (Msg m : msgs)
    lc.add(htmlencode((m.fromUser ? "U: " : "B: ") + m.text));
  ret id + " [" + htmlencode(formatDateAndTime(startTime)) + "-" + htmlencode(formatDateAndTime(endTime)) + "]" + ul(lc);
}