Editing is now possible, deleting schools is currently not possible. Users can only set the status of schools as cancelled. There are at least two options I guess, but feedback from the community is needed:
Simply making schools deletable like all other objects. However, deleting schools might have drastic consequences, i.e. if a school decided to participate again.
Settings schools to cancelled. Then it might be a good idea to have an expandable section of cancelled schools at the bottom so that they don't disturb the view of the table.
with all belonging information. In particular, update the status of a school