static S webChatBotLogsHTML2(final S baseLink, final SS params) {
  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)
        if (l(msgs) > 1)
          l.add(webChatBotLogsHTML_formatDialog(conv.id + "/" + (i--), msgs));
    }

    int perPage = 50, n = parseIntOpt(params.get("n"));
    ret h3_htitle("Chat Logs") +
      pageNav2(baseLink, l(l), n, perPage, "n")
        + ul(subList(l, n, n+perPage), null, style := "margin-top: 1em");
  });
}