I strongly advise you don’t “reset your database” since that won’t even make sense to most people …. I can’t say I know even know what you mean by “resetting a database”, but there’s a good chance someone may misinterpret this and erase their database or create a new one …. don’t do that, you’ll lose all your data ….
If you lose data in your upgrade, you should restore it with the backup you made BEFORE you attempted to upgrade … since this should be a pretty rare occurrence, it shouldn’t affect most people ….
If you aren’t sure what to do with Popup Domination, delete it and upload the newer version.