1. New chat attribute `First response time (agent)` attribute `frt`.
2. New chat attribute `Max response time (agent)`attribute `mart`.
3. New chat attribute `Average response time (agent)` attribute `aart`.
4. All new attributes is represented in chat statistic/search/chat right column.
5. Agents can have personal theme by having `'lhabstract','use'` and `'lhtheme','personaltheme'` permissions.
6. To update present chats with new attributes values you can run `php cron.php -s site_admin -c cron/util/update_times -p <chat_id_to_update_from>`

For update just follow standard update procedure. For manual update it's update_300.sql