AKModel: Rename and change semantic from plan_hidden to plan_published?
To make the visibility state of the plan more intuitively, maybe rename it and change its semantic. An example that would profit from that would be the event overview in backend, that currently marks those events with a hidden plan with a checkmark instead of marking those with a visible plan:
Since the semantic is only reversed, the necessary migrations steps could be done automatically (add a second field with reversed semantic, fill based on original field, delete old field).
Alternatively, we should at least think of introducing a proxy property that could be used, e.g., in admin interface instead of the actual db value -- however, one would have to check whether this could be used in all places, e.g., in filters and that still means that developers have to work with the reversed model in mind.