Not sure I really mentioned much 'enterprise-level', beyond SQL Server?

I guess I'm making it sound more complicated than it really is then, because this approach is actually a lot simpler than the 'N-tier' abstraction-hell of yesteryear.

Jimmy Bogard has a simple example here: https://github.com/jbogard/ContosoUniversityDotNetCore

Some code can probably explain it better than me ;)