Remove priority - its insufficient:
- For events which depend upon the existence of an identity, they should be processed after the notification which creates an identity. This could be guaranteed by the priority. But if an identity is deleted, events which depend upon the existence of the identity must be processed BEFORE the deletion. The only way to solve this properly is to have a queue for each client so we are able to fully preserve the order in which WOT actually created the events - it WILL issue them in proper order, we were just unable to store it properly with the old data model.