Header-only foundation for the structural refactor that moves fewo-webapp
from per-entity *Db clients to a shared Repository<TDto> abstraction. This
ships interfaces only — no concrete implementations, no callers updated.
Decisions baked in (all settled in the issue body):
- Mixed entity_id allocation: caller may supply, otherwise the concrete
repo generates a UUID inside save().
- UnitOfWork / cross-repo transactions: explicitly out of scope.
- Repository<T> is a virtual-method interface, not a C++20 concept.
- History queries live on a separate IHistoryRepository<T> so non-temporal
repos don't have to implement a stub.
Decorators (TemporalRepository<T>, ScopeGuardRepository<T>) follow in #8;
the optional IQueryable<T> capability for typed filtering follows in #9.
The fewo-webapp Person pilot (uwe.admin/fewo-webapp#457) and the wider
26-entity rollout (uwe.admin/fewo-webapp#458) build on this.
Closes#7
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Uwe Schuster
a0c61b3d94