Initial certificate system

backend/app/api/routes/admin_dashboard.py

@@ -0,0 +1,22 @@
+from fastapi import APIRouter, Depends
+from sqlalchemy.orm import Session
+
+from app.api.deps import require_roles
+from app.db.session import get_db
+from app.models import AdminUser, Certificate, ImportBatch, Learner
+
+router = APIRouter()
+
+
+@router.get("/summary")
+def get_summary(
+    db: Session = Depends(get_db),
+    _: AdminUser = Depends(require_roles("system_admin", "certificate_admin", "readonly")),
+) -> dict[str, int]:
+    return {
+        "learner_count": db.query(Learner).count(),
+        "certificate_count": db.query(Certificate).count(),
+        "valid_certificate_count": db.query(Certificate).filter(Certificate.status == "valid").count(),
+        "voided_certificate_count": db.query(Certificate).filter(Certificate.status == "voided").count(),
+        "recent_import_count": db.query(ImportBatch).count(),
+    }