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https://github.com/cayleygraph/cayley is currently on the frontpage of HN, and it does use PGSQL as backend.

Does it scale is a very valid question for Cayley. Running sparql.uniprot.org I know virtuoso scales easily to 27 billion triples. Best benchmark I have seen for Cayley is 21 million RDF triples.

RDF and relational are similar but free form RDF is hard to put into a pure relational schema, as schema is derived from the data in RDF. There are ways to recover relational schema's from RDF but these are not yet in production state.

i helped build a triple store on top of postgresql back in '06-'08. company is gone so i don't know where the IP ended up, but it was a good foundation. we were competitive with the other players at the time.

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