Content locking, or other solution for concurrent editing?

[jessesheidlower]

I'm trying to find a way to deal with the danger of concurrent editing, and I don't see any discussion of this here, or on Reddit or Stack Overflow.

Currently it seems that multiple people can edit the same entry at the same time, and this is not only prevented, but it's not even acknowledged in any way; the last edit wins, and no one else even knows that their change got clobbered. I'm not looking for a versioning system, which would be more complicated, just a way to prevent or at least warn about this.

Is there any solution or at least discussion of this anywhere? It would seem to be a pretty basic problem for any site that has more than one admin user.