Note that this was written in 2016 in the context of a mysql-centric project. You will not find an "unchanging strong opinion that foreign keys should not be us

Note that this was written in 2016 in the context of a mysql-centric project. You will not find an "unchanging strong opinion that foreign keys should not be used" outside that context. I haven't kept up with mysql enough to know if there are still good reasons to avoid foreign keys. I just stick with postgresql.