Add clubmanager.base.validate_club_scope(instance, owning_club_id, ...): a
shared model-clean() helper that rejects FKs leaking across clubs. Club-scoped
FKs must share the owning club; Member FKs must have a ClubMembership in it.
Unset FKs are skipped.
Nothing enforced tenant consistency on the FKs between club-scoped rows, so an
order could reference another club's product, an event another club's season,
and so on. The following commits wire this into each app's clean().
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Bernard Siebens
c320931595