fix duplicate user

orders-events/app/events/start_fulfillment.py

@@ -270,21 +270,11 @@ def _enroll_now(enrollment: Enrollment, context: Context) -> None:
                 'seat': {'order_id': order_id},
             }
         )
-        # Relationships between this enrollment and its related entities
-        transact.put(
-            item={
-                'id': order_id,
-                'sk': f'LINKED_ENTITIES#CHILD#ENROLLMENT#{enrollment.id}',
-                'created_at': now_,
-            },
-            cond_expr='attribute_not_exists(sk)',
-            table_name=ORDER_TABLE,
-        )
-        # Child knows the parent
+        # Enrollment should know where it comes from
         transact.put(
             item={
                 'id': enrollment.id,
-                'sk': f'LINKED_ENTITIES#PARENT#ORDER#{order_id}',
+                'sk': f'LINKED_ENTITY#PARENT#ORDER#{order_id}',
                 'created_at': now_,
             },
             cond_expr='attribute_not_exists(sk)',