update acs_objects
set security_inherit_p = 'f'
where object_id in (select calendar_id from calendars
where calendar_name = 'Personal')
delete from notification_requests
where request_id in (select request_id
from notification_requests, calendars
where calendar_name = 'Personal' and package_id = object_id
and type_id = (select type_id
from notification_types
where short_name = 'calendar_notif'))