In the effort to reduce the number of database connections I introduced a small bug. This only affected the test templated letter flow, a None type error would happen when trying to creathe completed_at timestamp for a delivered message.

In the previous PR I removed the `update_notification` method to reduce the need for another update query. However, that meant the notification was marked as delivered without an updated_at timestamp.

It is weird to set the updated_at when we create the notification. So is this a better fix? Or do I put the update back now?

I recommend we push this fix now.

app/notifications/process_notifications.py

@@ -79,7 +79,8 @@ def persist_notification(
     billable_units=None,
     postage=None,
     template_postage=None,
-    document_download_count=None
+    document_download_count=None,
+    updated_at=None
 ):
     notification_created_at = created_at or datetime.utcnow()
     if not notification_id:
@@ -105,6 +106,7 @@ def persist_notification(
         reply_to_text=reply_to_text,
         billable_units=billable_units,
         document_download_count=document_download_count,
+        updated_at=updated_at
     )
 
     if notification_type == SMS_TYPE: