add access_expires_at to enrollment

enrollments-events/app/events/stopgap/patch_course_metadata.py

@@ -1,5 +1,6 @@
 import json
 import sqlite3
+from datetime import timedelta
 
 from aws_lambda_powertools import Logger
 from aws_lambda_powertools.utilities.data_classes import (
@@ -34,8 +35,17 @@ def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
 
     try:
         course = _get_course(new_image['course']['id'])
+        access_period = int(course['access_period'])
+        access_expires_at = now_ + timedelta(days=access_period)
 
         with enrollment_layer.transact_writer() as transact:
+            transact.update(
+                key=KeyPair(new_image['id'], new_image['sk']),
+                update_expr='SET access_expires_at = :access_expires_at',
+                expr_attr_values={
+                    ':access_expires_at': access_expires_at,
+                },
+            )
             transact.put(
                 item={
                     'id': new_image['id'],
@@ -49,7 +59,7 @@ def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
                     'id': new_image['id'],
                     'sk': 'METADATA#COURSE',
                     'created_at': now_,
-                    'access_period': int(course['access_period']),
+                    'access_period': access_period,
                     'cert': course.get('cert', None),
                 }
             )