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• Fall 2014: Design of edx-notifications for McKinsey
• Sep 2016: Design of Notifications: System diagram, with learnings from above
• Fall 2017: RET team implements ACE, based on above 

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• celery-utils capabilities - LoggingTask and PersistOnFailureTask
• Using kwargs instead of positional args
• For real-time synchronization with management command as fallback of celery failures

15. User Identifiers

• Some background here: /wiki/spaces/AN/pages/144441849
• Current thoughts are to identify users by randomly generated UUIDs instead of username (privacy issues) or LMS user_id (database entry, which is guessable and leaks info on number of entries) or (anonymous_user_id, which is tied to a server-wide secret_key).