Ask HN: I'm trying to represent an entire building as a graph

Ask HN: I'm trying to represent an entire building as a graph
This entire graph would have to represent every entity in the building, including the control nodes. It's an IoT graph, where a node may represent the light switch, connected to a particular desk(also a node). This graph should also show directions from one entity to another. For now, I have a photoshop pipeline which generates a simplified graph from a color coded image, using NetworkX. This is a temporary replacement for when the actual BIM comes along. But the graph remains. Are there any libraries out there that would help me or should I just roll my own system? I'm not sure I would like to add Neo4J to the stack. Storing everything to Postgres seems to work fine. It's the in memory representation that I have problems with.