Update admin.py #2
                
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The modifications added:
Custom Action (mark_as_published): Allows admins to select multiple videos and mark them as published in bulk.
Video Duration (duration method): Converts the video's duration (assumed in seconds) into a readable "minutes:seconds" format.
Enhanced get_queryset: Filters the VideoPublishedProxy model to only show active videos and sorts them by the most recent publish timestamp.