Notification System:
Project length: 350 hours
Phase 1:
	Create notification table in metabrainz
	Create new OAuth scope for notification_sender
	Create post endpoint to send notifications from projects with oauth
Phase 2:
	Create endpoint to fetch notifications
	Create endpoint to mark notifications as read/unread
	Create endpoint to delete notifications
	Cron job for clearing notification past their expire age
Phase 3:
	Creator options in admin page of the project sending notifs
	Allowing users to choose if notifs are sent in digest or individually
	Integration into brainzutils by adding a send_notification function which utilizes the /notification/send endpoint. 

Phase 4:
	Integration into listenbrainz by replacing send_mail function with send_notifications and migrating the templates to metabrainz
	Integration into musicbrainz by changing functions sending mail to functions sending notifications to endpoint.
Phase 5:
	Integration into bookbrainz by creating a js library similar to brainzutils but for sending notifications and this function can be used later while sending out mails.