Bernard Siebens
076a9cacbc
Introduce the teams app: Team and Position (both club-scoped, with per-club unique names), TeamMembership (season-scoped roster with jersey number + captain flags, unique member and jersey per team/season), and StaffAssignment (coaching/staff, filtered to staff positions). All uniqueness expressed as UniqueConstraints. Register every model in the admin (with roster + staff inlines on Team) and cover the models with tests. Fix two model bugs surfaced by the system check: StaffAssignment.position reused TeamMembership's reverse accessor (Position.team_memberships) and duplicated its constraint name. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>