hi sandGorgon. I agree with mhluongo on this. If you want to do things like transitive closure or connected components, you fall in the 2% section above. However, if you want to encode graphs for message systems, a simple table with parent-id might do just fine. Wrt jsonb: if you only do key->jsonb tables, you might want to consider another kind of system. Nevertheless, we've got millions of trajectories, connected to millions of annotations (links to trajectories with semi-structured jsonb), and combined with some GIN indexes, it works pretty well.