Ensure to create a backup of the database before executing any of the listed scripts.
Execute the following script against the database which is configured for NHibernate Persistence:
DELETE FROM <subscriptionTable> WHERE SubscriberEndpoint = '<subscriberAddress>'
<subscriberAddress>is the address of the subscriber. E.g.
<subscriptionTable>is the configured subscription table for NHibernate Persistence. By default this is