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What's wrong with Catalogrule's cron job?

catalogrule/observer::dailyCatalogUpdate called by the catalogrule_apply_all cron job will delete block caches every night:

What's wrong with this?

  1. It shouldn't do this if there are no catalog rules in the first place.
  2. Even if there are catalog rules it should check if the current execution time is close to any job's start or stop date and only flush caches then.
  3. The configuration ( basically only allows adding caches, but not removing any caches.
  4. Cleaning caches - if actually required - should happen after reindexing. It's not safe to assume that noone will hit any affected page after it was cleaned and before the indexers are done.
  5. How will full page cache implementations and other proxies (e.g Varnish) be able to update/purge their caches? I guess a separate event should be dispatched here...
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