Digikam can't find my photo images

[Bill Allen]

System is macos, digikam installed with homebrew. Everything normally works 
great, but at times which I believe are associated with system updates, 
digikam can no longer find my album. This has happened in the past, and 
I've been able to correct it, but it's been a while and either I can't 
remember how I did it (it seems like it was as simple as telling digikam 
where the files are at the startup dialog, but this time that didn't help) 
or something else is wrong. The files are there, I can look at them using 
normal file utilities.

Using sqlite3, I looked at the table AlbumRoots and everything looks 
correct except the identifier field which has "volumeid:?uuid=5908...", 
where when I look at the macos disk utility, I see that my local hard drive 
has a uuid "4FA9......". Is this the problem? If so, how can I fix it 
without triggering a full rescan of my photos? If that isn't the problem, 
where can I look to fix it? 

Best regards,
Bill