diff --git a/backend-compliance/compliance/api/canonical_control_routes.py b/backend-compliance/compliance/api/canonical_control_routes.py
index 20288c3..bf89cd5 100644
--- a/backend-compliance/compliance/api/canonical_control_routes.py
+++ b/backend-compliance/compliance/api/canonical_control_routes.py
@@ -1259,6 +1259,11 @@ async def backfill_rationale(
                     "control_id": parent.control_id,
                     "error": str(e)[:200],
                 })
+                # Rollback um DB-Session nach Fehler nutzbar zu halten
+                try:
+                    db.rollback()
+                except Exception:
+                    pass
 
         db.commit()