When you mark an item on Portal as "Delete Protection" in the service settings, make the fact that this setting is turned on apparent when viewing all your content similar to how there's an icon for marking something as authoritative. I try to keep this setting on for all of our production services, and it would be nice to just glance down the list of our services and see which have it and which don't. Currently, you have to click on each individual item and go to the settings to see if it's turned on or not.
