OpenACS

One of the most expensive operations in large site is the cleanup for

notification_requests in situations, where the user has lost

permissions on an object, on which the user wanted to receive

notifications.  This check was performed previously in

notification::sweep::cleanup_notifications via a permission check over

all notification requests, which can be very costly on large

sites. This change moves this cleanup into the actual notification

sending, where the permissions have to be sent anyhow.

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