It makes sense to leave managed services outside. Do you really want to be responsible for maintaining your Postgres database? Dealing with upgrades, backups, replication etc...

Much better to leave that to the cloud provider to manage.

From the article:

> However, as a project grows, like Panelbear, I move the database out of the cluster into RDS, and let AWS take care of encrypted backups, security updates and all the other stuff that’s no fun to mess up.