thank you for the hint, unfortunately nothing changed
docker compose exec -it zammad-railsserver /bin/bash
zammad@14d4ba7f643e:~$ bin/rails c -e production
I, [2024-03-27T14:27:25.987658 #14482] INFO -- : ActionCable is using the redis instance at redis://zammad-redis:6379.
I, [2024-03-27T14:27:25.995461#14482-6000] INFO -- : Using memcached as Rails cache store.
I, [2024-03-27T14:27:25.995525#14482-6000] INFO -- : Using the Redis back end for Zammad's web socket session store.
Loading production environment (Rails 7.0.8.1)
[1] pry(main)> Setting.count
=> 0