add events

http-api/app/rules/enrollment.py

@@ -65,6 +65,16 @@ class LifecycleEvents(str, Enum):
     EXPIRATION = 'schedules#expiration'
 
 
+class SlotDoesNotExistError(Exception):
+    def __init__(self, *args):
+        super().__init__('Slot does not exist')
+
+
+class DeduplicationConflictError(Exception):
+    def __init__(self, *args):
+        super().__init__('Enrollment already exists')
+
+
 def enroll(
     enrollment: Enrollment,
     *,
@@ -151,7 +161,7 @@ def enroll(
             transact.put(
                 item={
                     'id': enrollment.id,
-                    'sk': f'linked_entities#{type}',
+                    'sk': f'LINKED_ENTITIES#{type}',
                     'created_at': now_,
                     f'{type}_id': entity.id,
                 }
@@ -169,10 +179,6 @@ def enroll(
                 }
             )
 
-            class SlotDoesNotExistError(Exception):
-                def __init__(self, *args):
-                    super().__init__('Slot does not exist')
-
             transact.delete(
                 key=KeyPair(slot.id, slot.sk),
                 cond_expr='attribute_exists(sk)',
@@ -197,10 +203,6 @@ def enroll(
                 },
             )
 
-        class DeduplicationConflictError(Exception):
-            def __init__(self, *args):
-                super().__init__('Enrollment already exists')
-
         # Prevents the user from enrolling in the same course again until
         # the deduplication window expires or is removed.
         if deduplication_window: