Deleting a study should also delete all experiments and signatures under that study. Deleting an experiment should similarly delete all signatures under that experiment. This is not high priority but I think it's what curators intuitively expect, there's no use case for keeping these sub-pages, it can take a while to delete them one by one, and this change would greatly cut down on the number of orphaned pages. However, after a cascading deletion it should also be not too difficult to restore everything.
Deleting a study should also delete all experiments and signatures under that study. Deleting an experiment should similarly delete all signatures under that experiment. This is not high priority but I think it's what curators intuitively expect, there's no use case for keeping these sub-pages, it can take a while to delete them one by one, and this change would greatly cut down on the number of orphaned pages. However, after a cascading deletion it should also be not too difficult to restore everything.