Prior to creating an app with a database add-on, a database must be setup in AppPack with
apppack create database. This creates a managed RDS database cluster/instance at AWS. Both Postgres and MySQL are supported in Aurora or the standard variants.
Enabling the database add-on will create a dedicated database and user within the RDS cluster/instance for the app.
Destroying the application will also destroy the database associated with it.
DATABASE_URLthe credentials for connecting to the cluster