diff --git a/backend/app/models/__init__.py b/backend/app/models/__init__.py
new file mode 100644
index 0000000..798792e
--- /dev/null
+++ b/backend/app/models/__init__.py
@@ -0,0 +1,16 @@
+"""SQLAlchemy models for all domain entities."""
+from app.models.base import Base, TimestampMixin, TenantMixin
+from app.models.tenant import Tenant
+from app.models.user import User
+from app.models.project import Project
+from app.models.task import Task
+from app.models.worker import AIWorker
+from app.models.artifact import Artifact
+from app.models.review import Review
+from app.models.cost import CostLog
+
+__all__ = [
+    "Base", "TimestampMixin", "TenantMixin",
+    "Tenant", "User", "Project", "Task",
+    "AIWorker", "Artifact", "Review", "CostLog",
+]