The German state archive (Bundesarchiv) has a new user interface and person ids. So all our links to memorial records are now broken. Like the one for David Zilversmit:
Would love to but there is no known formula to convert the old page ids to the new ones. Like in my example 279941==>1272970 or for Mathilde Wollner 1002518==>1732361
I think only manual repairing the links is possible. Googling site:wikitree.com/wiki "gedenkbuch" currently gives about 246 hits.