This is maybe a stretch, but anyone have resources for making the server side of a M.U.S.H./MUD kind of experience?

I can understand how to do this from a "make a text adventure room based system" angle. Objects, rooms, doors, and actors(pcs).

But it falls apart when I think about doing this in multiplayer. I think one needs to be host and have a database? And then all pcs submit commands and get validated, somehow? Never built this kind of thing. Open to any resources or research sources!