fix duplicate user

enrollments-events/app/events/enroll_scheduled.py

@@ -14,8 +14,6 @@ from boto3clients import dynamodb_client
 from config import ENROLLMENT_TABLE, ORDER_TABLE
 from enrollment import (
     Enrollment,
-    Kind,
-    LinkedEntity,
     Seat,
     Subscription,
     enroll,
@@ -54,21 +52,6 @@ def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
     )
 
     try:
-        # The enrollment must know its source
-        linked_entities = (
-            frozenset(
-                {
-                    LinkedEntity(
-                        id=seat['order_id'],
-                        kind=Kind.ORDER,
-                        table_name=ORDER_TABLE,
-                    ),
-                },
-            )
-            if seat
-            else frozenset()
-        )
-
         enroll(
             enrollment,
             org={
@@ -82,7 +65,6 @@ def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
             scheduled_at=datetime.fromisoformat(old_image['scheduled_at']),
             # Transfer the deduplication window if it exists
             deduplication_window={'offset_days': offset_days} if offset_days else None,
-            linked_entities=linked_entities,
             persistence_layer=dyn,
         )
 
@@ -105,17 +87,49 @@ def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
                 ),
             )
     except Exception as exc:
-        dyn.put_item(
-            item={
-                'id': old_image['id'],
-                'sk': f'{sk}#FAILED',
-                'cause': {
-                    'type': type(exc).__name__,
-                    'message': str(exc),
-                },
-                'snapshot': old_image,
-                'created_at': now_,
-            }
-        )
+        with dyn.transact_writer() as transact:
+            transact.put(
+                item={
+                    'id': old_image['id'],
+                    'sk': f'{sk}#FAILED',
+                    'cause': {
+                        'type': type(exc).__name__,
+                        'message': str(exc),
+                    },
+                    'snapshot': old_image,
+                    'created_at': now_,
+                }
+            )
+
+            if seat:
+                order_id = seat['order_id']
+                transact.update(
+                    key=KeyPair(
+                        pk=order_id,
+                        sk=f'ENROLLMENT#{enrollment.id}',
+                    ),
+                    cond_expr='attribute_exists(sk) AND #status = :scheduled',
+                    update_expr='SET #status = :rollback, \
+                             rollback_at = :now, \
+                             reason = :reason',
+                    expr_attr_names={
+                        '#status': 'status',
+                    },
+                    expr_attr_values={
+                        ':rollback': 'ROLLBACK',
+                        ':scheduled': 'SCHEDULED',
+                        ':reason': 'DEDUPLICATION',
+                        ':now': now_,
+                    },
+                    table_name=ORDER_TABLE,
+                )
+                transact.put(
+                    item={
+                        'id': f'SEAT#ORG#{org_id}',
+                        'sk': f'ORDER#{order_id}#ENROLLMENT#{uuid4()}',
+                        'course': enrollment.course.model_dump(),
+                        'created_at': now_,
+                    }
+                )
 
     return True