it's not a plugin, it's just a driver. all of them are available in the binary. the graph schema already implements nip-01, to make it really useful, it just needs to make more vertices to cover follow, mute and report vectors and another independent server can share the neo4j (or dgraph) instance with the relay and always know the graph is current. when it replaces and deletes events, it deletes all of the edges associated with it.