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Analytics database tables are getting big, and so we're likely moving to a model where ~all stats are day stats, and we keep hourly stats only for the last N days. Also changed the name because: * messages_sent_* suggests the counts (summed over subgroup) should be the same as the other messages_sent stats, but they are different (these don't include PMs). * messages_sent_by_stream:is_bot:day is longer than 32 characters, the max allowable length for a BaseCount.property. Includes a database migration to remove the old stat from the analytics tables.