If it’s not a 2.8 issue it is definetly a 2.7.1 issue that i hope is not continued in 2.8. The websites are wiped, be sure of that. The database is ok. I don’t have complete backups and I did do some modifications to the template through the web editor. The database is ok, though. But no plugins should affect a upgrade. Seriously, why would you allow such a design ? Yes, it won’t have perfect OOP, with no duplicate code but this situation wouldn’t happen. It’s also important to have some real data safety. And I can’t imagine what plugin can delete in cascade everything.