- Introduced a new `status` field to the `Risk` model with choices for "open", "in_progress", "closed", and "review_required".
- Created a `NotificationPreference` model to manage user notification settings for various events related to risks, controls, residual risks, reviews, users, and incidents.
- Updated the admin interface to include `NotificationPreference` inline with the `User` admin.
- Enhanced signal handlers to send notifications based on user preferences for created, updated, and deleted events for users, risks, controls, and incidents.
- Modified the `check_risk_followups` utility function to update risk status and create notifications for follow-ups.
- Updated serializers and views to accommodate the new `status` field and improved risk listing functionality.
- Added a new section in the risk detail template to display related incidents.
- Removed the unused statistics view from URLs.
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