I really like the "single source of truth" too.

How much does Ramses integrate with the data source "automatically"? Is it like StrongLoop/LoopBack?

We've found that for most of our projects we're not connecting directly to a database, but instead trying to present an (mobile or web) app-specific API that abstracts/unifies/focusses the many data sources and services that may be needed.

For example, one recent project involved data coming from some old SOAP services, new HTTP (but not exactly RESTful) endpoints, and several public APIs too.