Remove deprecated "submission" ScheduleItem type - #4805

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Project	Deployment	Actions	Updated (UTC)
pycon	Ready	Preview	Aug 16, 2026 12:07pm

Removes the deprecated submission ScheduleItem type (already data-migrated to talk back in migration 0041), updates callers/tests accordingly, and adds the corresponding schema migration.

• backend/importer/management/commands/import_old_db.py:503 still creates ScheduleItem rows with type="submission" if submission else "custom". Since submission is no longer a valid TYPES choice after this change, this legacy importer needs updating to use "talk" instead, otherwise it will keep writing an invalid/unrecognized type value that won't match the talk/training filters used elsewhere (e.g. schedule/admin.py, conferences/admin/conference.py).
• conferences/types.py's talks field now unconditionally returns self.schedule_items.none(). This matches the field's actual behavior since 2022 (no data has had type=submission since migration 0041), but it's worth confirming this is intentional to keep as permanently dead code (it backs the frontend's AllTalks/getStaticPaths query in frontend/src/pages/event/[slug]/index.tsx, which will keep pre-building zero static talk paths) rather than switching the filter to type=talk to restore the original intent of listing talks.

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.11%. Comparing base (29e4c07) to head (bcb0a57).

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- Coverage   93.11%   93.11%   -0.01%     
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  Lines       11239    11236       -3     
  Branches      905      904       -1     
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- Hits        10465    10462       -3     
  Misses        663      663              
  Partials      111      111