Function descriptors_to_nquins 

pub fn descriptors_to_nquins(
    asset_subject: u64,
    d: &Descriptors,
) -> (Vec<NQuin>, HashMap<u64, String>)

Emit descriptor edges for an asset subject. Each string facet’s object is fnv60(value) (so a search for that value matches); event times are stored as their u64 bit pattern for range scans.