Deletion of Projects - Timesheet implications

[anovak]

I thought I was clearing out my test database when I deleted all
projects (but left enterprise resource pool intact).

Then I discovered there are timesheets still out there. What are the
implications and how should I clear all those out - the delete option
from PWA?

When a timesheet is deleted for a user, does it just set it back to
where they can create it again or is it gone forever?

Thanks,
Andy Novak
UNT