I tried to use the git version of adminPanel with my existing install (not latest git) - it doesn't show anything... the old adminPanel didn't do anything.
How do i reset a user's password?
Can i go into the sql database and add shares into a table to make up for the fact that i had to delete the user's duplicate entries?
Also
BUG: You can register the same username more than once.

What is the php error from adminPanel? It should display if you have the admin flag.
I haven't implemented password reset, I'll add that to the adminPanel and a user option based on email.
If you want to do it manually, update the pass in webUsers to sha256 of pw+your salt.
your best bet for solving miner-related issues is to update shares or shares_history username to the new miner id, but dummy shares should work.
As for the bug, set your username in webUsers to unique. That should stop duplicates for now. I'll add a proper check in the next version.