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Which RDF data store uses Postgres as DB backend? And can one import WikiData? (does it scale) (I would rather avoid these old school RDF special case stores from SematicWeb days 10 years ago.)

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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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