When FP? And When OOP?

If you step back, you see that a database is a big data structure, and the applications are bundles of operations acting upon it. The heart of nearly every business application is a big functional database, a data structure with operations acting upon it. So if we had all the things that need to be in business software written on cards, those that represent long-term, relatively changeless relationships go in the database, while those that represent short-term operations that evolve and change over time go in the application.

Source: raganwald.com