My Incus Systemd Service doesn’t start, I don’t know how I broke it.
It says “listen tcp 192.168.20.241:8443: bind: cannot assign requested address” The IP Address is wrong it should be 192.168.20.105.
Is it fixable by editing it in the database?
You can fix it without touching the database.
You can do:
ip -4 a add dev lo 192.168.20.241/32
Which will add that IP address temporarily to your loopback device. Then once Incus is started, configure it to listen to the correct address.
That helped but changing the cluster IP is not allowed. In hindside it wasn’t the best idea to depend on DHCP for a static IP 
Ah yeah, indeed, the cluster address cannot be changed, at least not without significant effort.
Any change you can just pin your machine to its old IP in the DHCP server?
As it is a Laptop I think going with an additional IP the interface maybe the least problematic solution in the unpredictiable IP-Address future.