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The notifications task module was never imported by the loyalty.tasks package __init__, so celery's discovery walk loaded the package but never executed the @shared_task decorator on send_notification_email. The task was missing from the worker's [tasks] registry, so every .delay() call resulted in NotRegistered on the worker side — message ACKed, task silently dropped, no email_logs row written. Add the import (and update the module docstring / __all__) so the task is registered alongside the other loyalty background tasks. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>