I've seen a number of threads where Accordance is unable to start or crashes very often because of a corrupted preference or highlight file. Usually the solution is to navigate to a certain directory and delete the files.
At work we use Outlook for Mac for email and calendar stuff and sometimes the mailbox gets corrupted. To fix this, we can launch Outlook while holding option and we are presented with a dialog that allows us to repair our mailbox or delete it entirely.
I think it would be nice for Accordance to have this ability - holding option while launching the app will bring up a dialog box that allows the user to do some regular maintenance items.