Update ScheduleItem admin: title first column, add rooms list

[marcoacierno]

Summary

• Move title to be the first column in the ScheduleItem admin list view
• Add rooms list column to display room names

Closes #4655

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Project	Deployment	Actions	Updated (UTC)
pycon	Error		May 27, 2026 6:41am

[claude]

Adds a rooms_list column to the ScheduleItemAdmin list view and reorders columns so title appears before conference.

Performance — implicit prefetch dependency

rooms_list calls obj.rooms.all() on every row, which would be N+1 without the existing prefetch_related("rooms") in get_queryset. It works correctly today, but the method is silently coupled to that prefetch. If the queryset is reused in an export action or another context without the prefetch, it will silently degrade. Consider adding rooms to the list_prefetch_related tuple if Django admin supports it, or at minimum leave a comment linking the two.

Minor — asymmetric @admin.display usage (pre-existing)

speakers_names at line 513 lacks the @admin.display(description=...) decorator that the new rooms_list correctly uses. Not introduced by this PR, but the juxtaposition makes it more visible.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.52%. Comparing base (3aead8c) to head (d529c57).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4656   +/-   ##
=======================================
  Coverage   92.52%   92.52%           
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  Files         359      359           
  Lines       10791    10791           
  Branches      821      821           
=======================================
  Hits         9984     9984           
  Misses        696      696           
  Partials      111      111           

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