I just did a phone-to-phone transfer on iOS 15 and found that my DB didn't make it to the new phone. I'm in the process of seeing if this is also the case for an iCloud transfer as well.

I haven't looked too deeply into this yet, but did find the following:

Does this mean that this library does not put the database somewhere that will be syncable? Curious about the reasoning here as we really want to make sure that a users database is backed up to iCloud and will make it through a device to device transfer.