The backup does not help that much, I need a full backup of your database with mongo backup, otherwise I would create a totally different environment.
The migration was not running properly. I don’t know why. If you connect to your mongo database, you see a collection Migration with one document. Change version to 21 and restart Squidex. Then check if the number of documents in Events2 collection match to the number of documents in Events
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Thanks again! We now have it working on 5.2.1 - with Events2 matches the document count in Events.