class Internal::RemoveStaleRedisKeysService
  pattr_initialize [:account_id!]

  def perform(account_id)
    range_start = (Time.zone.now - PRESENCE_DURATION).to_i
    # exclusive minimum score is specified by prefixing (
    # we are clearing old records because this could clogg up the sorted set
    ::Redis::Alfred.zremrangebyscore(presence_key(account_id, 'Contact'), '-inf', "(#{range_start}")
  end
end