Excluding projects that immediately crashed and burned, I've never seen a database used by just one app. Even apps all in the same language is very rare. If any

Excluding projects that immediately crashed and burned, I've never seen a database used by just one app. Even apps all in the same language is very rare. If anyone on your team can absent-mindedly circumvent all your data integrity rules merely by setting up a database client, you're in for some long and painful nights.