8.9.0: Digikam keeps rescanning complete collection on each restart & grouped images are gone

[Jens Benecke]

Hello all,

I have been using Digikam on my PC for over 10 years and I'm still happy 
with it. My image collection is now way over 500GB, almost 200'000 files 
altogether, and all this worked fine on an i5-4570 4-core PC from 2013.

Until last weekend.

Since having upgraded from the 8.8.0 appimage (beginning of November) to 
8.9.0 appimage (current), Digikam keeps rescanning my complete default 
collection at /home/jens/Bilder (not the second one, and not one on an 
external drive), which takes about 2 hours since it's about 160.000 
images and 473 GB of data.
/home/jens/Bilder/Digikam is a symlink to a different drive, but this 
has never been a problem and this drive is permanently mounted, so I 
don't see the problem here.

Even if I let it finish and exit cleanly, the next time it will again 
rescan the complete collection.

Also I noticed that my album properties (e.g. album dates) and image 
groupings are gone since this happened the first time.

What happened here?
How can I fix this, and - possibly - even restore my image groupings?

I attached a debug log output (with the Marble log lines removed - too 
many) from starting the appimage on the console - maybe this helps.

Thank you!

-- 
Regards, Jens

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