That is a good question, I can’t see an option so it could be a case of changing the database with whatever database tool you are comfortable using or reseting user management and making the owner again.
We don’t really have a guide for that as there are lots of different tools you can use, The only thing I would say is make sure the n8n process is stopped when you try it.
It could be worth trying the reset commend first as well just to see if that helps.