Great, thanks for the follow up.
Just to note: The correct order is always folders first, then database as documented here: https://www.zenphoto.org/news/moving-and-changing-existing-installations/
If you had any kind of visitor in the meantime, Zenphoto would check the filesystem with the database and updated db after the filesystem, not the other way round.
For those albums/images requested by that visitor, so not for all at the same time, as the discovery happens "on request".