I certainly can’t say whether this is idiomatic as I was working it all out myself. But I’d basically write a type for each operation (as I’d read elsewhere). And honestly this was a bit of a drag too. I really wanted some reflection to make generating this code more ergonomic. From memory I’d have types like these

Author id: int, name: string, book_id: int

NewAuthor name: string, book_id: int

ViewAuthor name: string, book_title: string

Author represents the data in the db, NewAuthor allows for an insert operation, and ViewAuthor is for showing the data to a user.

You could argue for combing Author and NewAuthor and making id optional but I wanted to enforce at the type level that I was working with stored data without needing to check id everywhere.