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- Create organizations table with Alembic migration (3-phase: create table, migrate data, drop old column) - Add org_id FK on championships linking to organizations - Refactor all schemas into one-class-per-file packages (auth, championship, organization, participant, registration, user) - Update CRUD layer with selectinload for organization relationships - Update frontend types and components to use nested organization object - Remove phantom Championship fields (subtitle, venue, accent_color) from frontend Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>