I had an idea and made a proof of concept for a framework based on ontology language that generated both cloud resources (AWS cloud formation, with the plan to target similar infrastructure description languages) as well as a set of code snippets for CRUD operations to be deployed to those resources. The nice part was that you'd have all your types and data flow modeled in a source-controlled set of repos, and you could generate and publish up-to-date system diagrams at any level of granularity you wanted. Seemed cool but I never got around to doing much with it.