RDF: Migrate to using rdf

[gjwgit]

Need to quickly move to ttl instead of JSON for storing data in PODs

• blood pressure
• pathology

@prefix ns1: <http://example.org/health#> .

ns1:record_1 ns1:timestamp "2023-10-01T12:00:00Z" ;
    ns1:systolic "120" ;
    ns1:diastolic "80" ;
    ns1:heartRate "72" ;
    ns1:note "Normal" .

ns1:record_2 ns1:timestamp "2023-10-02T12:00:00Z" ;
    ns1:systolic "130" ;
    ns1:diastolic "85" ;
    ns1:heartRate "75" ;
    ns1:note "Slightly elevated" .