Event.count
=> 7442
>> e = AllEventsStats.new(:started_at => Event.first.timestamp, :stopped_at => Time.now)
=> #<AllEventsStats id: nil, type: "AllEventsStats", duration_key: nil, name: nil, statistic: nil, sid: nil, sig_id: nil, started_at: "2009-09-27 21:55:02", stopped_at: "2009-11-25 08:42:18", created_at: nil, updated_at: nil>
>> e.calculate!
=> true
>> e
=> #<AllEventsStats id: 4, type: "AllEventsStats", duration_key: nil, name: nil, statistic: 1492, sid: nil, sig_id: nil, started_at: "2009-09-27 21:55:02", stopped_at: "2009-11-25 08:42:18", created_at: "2009-11-25 08:42:23", updated_at: "2009-11-25 08:42:23">
>>