I use foreign keys with postgres, I used not to in mysql ~10 years ago. I feel it depends on the level of support of your db / how painful it is to override th

I use foreign keys with postgres, I used not to in mysql ~10 years ago. I feel it depends on the level of support of your db / how painful it is to override things if needed. Performance can be another reason for skipping them but modern dbs are pretty good.