add enrollments to order

orders-events/app/events/start_fulfillment.py

@@ -118,6 +118,8 @@ def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
             org_id=org_id,
         )
 
+        logger.debug('Some enrollments failed', failed=failed)
+
         with dyn.transact_writer() as transact:
             for x in failed:
                 reason = _friendly_reason(x.cause['type'])  # type: ignore
@@ -163,7 +165,7 @@ def _release_seats(
 ) -> None:
     now_ = now()
 
-    with dyn.transact_writer(table_name=ORDER_TABLE) as transact:
+    with dyn.transact_writer(table_name=ENROLLMENT_TABLE) as transact:
         for course in courses:
             transact.put(
                 item={
@@ -172,7 +174,6 @@ def _release_seats(
                     'course': course.model_dump(),
                     'created_at': now_,
                 },
-                table_name=ORDER_TABLE,
             )
 
 
@@ -263,6 +264,26 @@ 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
+        transact.put(
+            item={
+                'id': enrollment.id,
+                'sk': f'LINKED_ENTITIES#PARENT#ORDER#{order_id}',
+                'created_at': now_,
+            },
+            cond_expr='attribute_not_exists(sk)',
+        )
+
         transact.update(
             key=KeyPair(order_id, f'ENROLLMENT#{enrollment.id}'),
             update_expr='SET #status = :executed, \