get user id from order

enrollments-events/app/events/allocate_slots.py

@@ -54,8 +54,8 @@ def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
                     'id': f'vacancies#{tenant_id}',
                     'sk': f'{order_id}#{uuid4()}',
                     # Post-migration: uncomment the follow lines
-                    # 'id': f'slots#org#{tenant_id}',
-                    # 'sk': f'order#{order_id}#enrollment#{uuid4()}',
+                    # 'id': f'SLOT#ORG#{tenant_id}',
+                    # 'sk': f'ORDER#{order_id}#ENROLLMENT#{uuid4()}',
                     'course': asdict(slot),
                     'created_at': now_,
                 },
@@ -80,6 +80,7 @@ def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
 class Course:
     id: str
     name: str
+    # Post-migration: remove the following line
     time_in_days: int
 
 
@@ -93,6 +94,7 @@ def _get_courses(ids: set) -> tuple[Course, ...]:
         Course(
             id=idx,
             name=obj['name'],
+            # Post-migration: remove the following line
             time_in_days=int(obj['access_period']),
         )
         for idx, obj in result.items()