Problems after reinstalling digikam and recovering DK database from backup

Hi,


I had to reinstall my mac and recover from backup.

So on a fresh MacOS install, I did this:

1: Restore Pictures folder from backup - for my local photo collection, 
and this is also where all the digikam *.db files are located.

2: Restore these files from backup:

~/Library/Application Support/digikam

~/Library/Preferences/digikamrc

~/Library/Preferences/digikam_systemrc

~/Library/Preferences/org.digiKam.plist

3: Install digikam.

4: Start digikam.

Collection IDs have changed. So I set it to: "collection is still 
available but ID changed"


Then DK started to "Scan for new items". That is expected. It always 
does this when starting up. But this time it takes hours and hours. It 
is still going for several hours and progress is like this:


I would expect DK to not have to reindex everything because it should 
use the existing *.db files that are present because they were restored 
from backup. And the digikamrc should tell DK to use them ,right?


Did I miss something in my recovery procedure?


BR

Thomas