Add a column in the submission admin that tells if the submission is scheduled in the conference

[marcoacierno]

[marcoacierno]

@claude work on this

[claude]

Claude finished @marcoacierno's task in 3m 9s —— View job • claude/issue-4585-20260217-0951 • Create PR ➔

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Completed: Add is_scheduled column to submission admin

• Understand the existing submission admin structure
• Find how submissions are scheduled in conferences
• Add a column to show if submission is scheduled
• Add tests for the new functionality
• Commit and push changes

Summary of Changes:

Added a new "Scheduled" column to the submission admin that displays a checkmark (✓) or (✗) indicating whether a submission has been scheduled in the conference.

Files Modified:

• backend/submissions/admin.py - Added is_scheduled method and column, optimized queryset with prefetch
• backend/submissions/tests/test_admin.py - Added tests for the new is_scheduled method

Implementation Details:

• The column uses Django's @admin.display(boolean=True) decorator for checkbox display
• Uses prefetch_related("schedule_items") to avoid N+1 queries when loading the admin list
• Checks if a submission has any ScheduleItem records linked to it

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