Deleting a ticket from inside osTicket deletes the bug from ost_ticket, however, it doesn't seem to remove the events related to that bug from ost_ticket_event, which is what appears to be generating the dashboard info. However, in the past, when I went in and manually removed items from ost_ticket_event, it appeared to cause the dashboard to go weird and show "NaN" all over the place and no longer give accurate report data.
Am I missing a table that needs to have data removed?