Axiom is a relational algebra library it doesn't abstract an rdbms at all. The way datamapper 2 worked from my understanding was virtus was a property like api

Axiom is a relational algebra library it doesn't abstract an rdbms at all. The way datamapper 2 worked from my understanding was virtus was a property like api e.g. a back end agnostic schema that describes the data, axiom takes the relations (if any) from virtus then hands off the relations to a back end such as SQL, mongo, graphql query generator and optimizer. Datamapper 2 from looking is a much better structure.