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Thx guys, that did the trick.
I did delete the categories I wanted to delete via/through the admin area, and I assumed it would delete all albums that the categories contained.
This is apparently not the case.
I see no way to delete seperate albums through admin area (did I miss something??) so the database "operation" helped me out.
Thanks for your help and greetings,
[Edit]
Ah, now I see: you have to delete albums through the admin modus on the webpages themselves !!!
I'll try this when I clean up my albums next year !!
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