>they should be using business logic in code to do the validation I trust myself to do this, I don't trust my coworkers and future devs writing applications fo

>they should be using business logic in code to do the validation I trust myself to do this, I don't trust my coworkers and future devs writing applications for the same database to follow the same constraints in their code though. Constraints at the DB level keep your data clean(er) even if some other devs tries to shit it up.