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  • Yeah but ideally I wanted to avoid using my database ;-) Commented Oct 9, 2016 at 0:29
  • @MaximeLaval presumably my last answer then? Same as your number 2 but sharding the topics by user ID in addition to notification type. Commented Oct 9, 2016 at 0:31
  • Yeah I was referring to your last answer. But actually I realized that I would need to use some database anyway for options #3 and #4... Commented Oct 9, 2016 at 1:30