Are you asking for an example of separating the data models or an example of what happens when you don't. This is a good example of what separation enables you

Are you asking for an example of separating the data models or an example of what happens when you don't. This is a good example of what separation enables you to do: https://www.troyhunt.com/your-api-versioning-is-wrong-which-is/ https://www.troyhunt.com/your-api-versioning-is-wrong-which-... (it is presented from the perspective of how to version an API, but the examples of what it looks like are there)