Nextcloud Update 22 Exception: Database error when running migration latest for app notifications

Hello All,

after my update from 21.0.5. to Nextcloud 22 the following message appears:
Exception: Database error when running migration latest for app notifications

Server: Ubuntu 20.04 LTS
Apache 2.4.25
PHP 7.4.3

Can someone please help me. I have already searched here for solutions, but have not found anything.

For quick help I am grateful!

See Update from 21 to 22 failed (Exception: Database error when running migration latest for app notifications) for a solution by deleting data from the database (ugh!).