I've shipped multiple products that are backed by a SQLite database for core functionality (authentication, billing, and permissions mostly), and individual SQL

I've shipped multiple products that are backed by a SQLite database for core functionality (authentication, billing, and permissions mostly), and individual SQLite databases for customer data. It has made it incredibly simple to downgrade and delete customer data when they request. The application kills the billing profile, and emails the administrative email for the organization a link to download and delete their data.