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On a more minor note, the "home panel" (which appears when the discussion tab is first loaded and contains help and the control for subscribing to notifications) is currently feature flagged. That feature flag should be removed, and a separate one should be added to control only whether the notification subscription control appears.

Notifier

The notifier repo currently duplicates the username cipher that exists in edx-platform to compute the token to use for unsubscribe links. That value is also available in the notifier preference value for each user, so that code should be eliminated from the notifier.