Just a general grasp of the services and it's entities, maybe more sort of like a Service diagram, I'll rethink it, and each service should have it's own independent EER Diagram
Maintain some sort of logic than can actually create a monorepo from all of the other services using Turborepo and some copy and paste or cloning (automated, obviously) from the other repos. As to have the other option if it won't cause too much trouble that is.
Just an idea that could actually be really fun and intresting to explore. And challenging maybe, hopefully (in a good way tho).
Define each service, the CHANGELOG (it'd be nice that it could be updated automatically in some sort of way, replcating an existing CHANGELOG or creating a new one from merging the other repositories).
A little description about the project, and it'd be a plus to have the architecture design & choices up there too!