I did the approach with nesting jsonb_agg queries, it worked for me but was a bit hacky and sometimes complex. I hoped for Graph Query Language (the one suppose

I did the approach with nesting jsonb_agg queries, it worked for me but was a bit hacky and sometimes complex. I hoped for Graph Query Language (the one supposed to be part of SQL standard) to make it easier to retrieve structred json from flat tables, but it doesn't look ready yet.