Use exists() and iterator() on big QS of check tasks to reduce memory footprint and useless QS caching, like advised in http://blog.etianen.com/blog/2013/06/08/django-querysets/
Use exists() and iterator() on big QS of check tasks to reduce memory footprint and useless QS caching, like advised in http://blog.etianen.com/blog/2013/06/08/django-querysets/

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