Rated 5 out of 5 stars

During the migration i encountered some issues (stuck at Migration cardbookIDBCard 2/8) and the developers help me.
You can find the solution there :
https://gitlab.com/CardBook/CardBook/-/issues/1705#note_2200521131
turn indexedDB.cardsMigrated" to true
turn indexedDB.mailpopsMigrated to true
turn "indexedDB.imagesMigrated" to "true"

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