To an application developer, this looks like nothing more than a code generator. Generated code is not source code and it should not be edited directly. Rather, you should change the generated code's source code and then re-generate it. While it may not be a layer between the app and the database, it's definitely an extra step in your build chain.

You'd be foolish to tie your application's build process to a cloud service that may disappear without warning. No sane developer would do such a thing. I don't see how this is any use to developers in any form other than a standalone compiler.