Close/Archive a Traditional Project without deleting it

I have some old projects that I would like to disable without deleting them. I would like to stop anyone, including myself, from adding new observations to them. I don’t want them to show up when adding an observation to a project on mobile. A sort of archival feature, really. Is this possible to do without completely changing how projects work?

Could you use the observation dates restrictions to “close” the project?
Just set the date of the latest observation as the date limit of the project.
No one would be able to add any more data unless they were adding historical records.


Observation dates aren’t a filter option in traditional projects, for some reason. The project would also still show up in the project list on mobile, but would throw you an error message if you tried to upload a wrong-date observation to it