I am explicitly not taking any side here, but that is certainly a matter of debate. Especially relational database management systems have all this functionalit

I am explicitly not taking any side here, but that is certainly a matter of debate. Especially relational database management systems have all this functionality like views and triggers and stored procedures so that you can move a substantial part of your business logic into the database management system and only have very thin clients in order to minimize duplication of business logic across different clients. Treating a database management system as a dumb data store is only one possible philosophy, admittedly the one that seems to be the dominant one currently, at least as far as I can tell.