Essentially we have a very specific network topology we are trying to build for each of our clients. The goal is to auto-generate as much of the input as possible, validate that which is given, and allow it to be lifecycled (attributes can change, but only in certain valid ways, objects created/changed/deleted, but only if they aren't referenced by other objects, etc). Due to this, a database is need to store each "object". When the network is "pushed", the database walked and a fresh set of ansible (or terraform for v2) is generated in seconds.

Iow, it is custom set of lego bricks that can only be combined in certain ways to build valid networks. It is propriety to our cloud product which has the benefit of allowing us to abstract things away that others probably couldn't, but the downside of making it entirely non-reusuable for a different use case.