The UUID library now uses overrides instead of the inherited Buffer
methods for better deserialization.

TODO: add conversions across layers from database to controller.

There is initial effort in implementing Auth0.

Separate reusable code from service-core.

The playback system is straightforward that it maps every note into its timestamps when
to start/stop playing. Included are the start and end indices when the notes are highlighted
in the data textarea.

Add integration tests and organize them by requirements.

Scaffold backend with Fastify CLI and replace Tap with Jest for
consistency.