I like this talk: "Domain Modeling Made Functional" by Scott Wlaschin https://www.youtube.com/watch?v=Up7LcbGZFuo He's working in F# but the concepts map.

There's a fascinating book "Data Model Patterns: A Metadata Map" by David C. Hay that's pretty much a Pattern Language or catalog for data models. You can just implement the subset of Hay's patterns that make sense for your application.