I have been charged with managing the transfer of our phpBB forum to Xenforo, and have stumbled across a problem that I didn't think I would come across.
I had spent the past few months experimenting with the software, which involved importing all data before it was ready for the actual transfer. Now, when I need to re-import the data, I can't remove the original data.
I have removed all attachments, threads and nodes, but there is no way to mass-delete users, which means that the synchronization will probably fail unless I simply go back to a vanilla installation or find some other way to remove the leftover data.
Now, I have no access to the database itself, and the head admin will be unreachable for some time to come. What is the easiest way to clear all data with FTP and admin access?