core vs merge repo node and edge header vs column content differences

[realmarcin]

The core repo nodes header is:
id category name description xref provided_by synonym deprecated iri object predicate relati
on same_as subject subsets

The merge repo header is similar but most fields empty:
id category name description xref provided_by synonym iri object predicate relation same_a
s subject subsets
assay:API_20A_ARA biolink:PhenotypicQuality API 20A - ARA