"""Repository layer: database access.

Each aggregate gets its own module (e.g. ``dsr_repository.py``) exposing a single
class with intent-named methods. Repositories own SQLAlchemy session usage; they
do not run business logic, and they do not import anything from
``compliance.api`` or ``compliance.services``.

Phase 1 refactor target: ``compliance.db.repository`` (1547 lines) is being
decomposed into per-aggregate modules under this package.
"""