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record channel size and message volume upon destruction

context

  • we would like to test a hypothesis that large channels tend to have longer lifetimes (and learn a bit about how much they are used)
  • this MR augments the CHANNEL_DESTROYED event to record metadata to allow us to study this question:
    • (1) how many members did the channel have when destroyed? (admins + subscribers)
    • (2) how many messages had been sent on the channel when it was destroyed? (broadcast in/out, command in/out)
  • it will maintain the invariant that once destroyed, a channel's phone number is not known to our system
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