Personally, I tend to think: The OS and the software have a new version number, from 4.0.0 to 5.0.0, so it’s a major version. Therefore, I’ll delete the database folder from my Mac and format my dedicated media drives. Then I’ll re-import my root folder, which contains subfolders, and then I’ll scan the entire library in EDJ Desktop before exporting my new database. By doing this, I’ll minimize the risk of conflicts with the various files created in the database (old vs. new): “hm.db, rbm.db, stm.db, trm.db, sm.db, itm.db, m.db”.