Deleting a database
The container and its data go. Its backups stay, which is the moment they matter.
cubeship db delete pg --yesOr Danger in the database's settings, which asks for the database's name.
What goes
The container, the data directory under <data dir>/datastores/, the
attachments to every app, and the database's metrics history. An app
that was attached keeps running on the variables its container was
created with until its next deploy, and gets none after.
What stays
Its backups. Deleting a database is exactly when they matter, so every dump it took is kept, listed under Backups of deleted databases on the Backups screen, and can be downloaded or deleted from there. See Backups.
What cannot be undone
Everything above. There is no soft delete: a database that has to come back is a new database with the same engine and a restore of the last dump — into a database whose name may be the old one, since the name is free again.