TimeStampedModel goes on UUIDModel, so all 28 domain models get row birthdays in
one place. Without them the dashboard can only ever describe the present: "42
members" is knowable, "members joined this month" is not, and no metric can show
direction.
Order dropped its own created/modified -- redeclaring a field from an abstract
base is an error, and its column survives as a plain AlterField (verbose_name
only), so no order data moves.
Note for reading early charts: auto_now_add backfills existing rows with a single
migration timestamp, so everything that predates this commit shares one birthday
and will show up as a spike at that instant rather than as real history.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Position gains management_position, distinguishing a coach/manager from other
staff (physio, kit manager). A CheckConstraint enforces that a management
position is always a staff position.
TeamMembership and StaffAssignment validate that their season and position
belong to the same club as the team.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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>
