use cswiki_p;

set @begin = '20150101000000', @end = '20160101000000';

select date(date_add(rev_timestamp, interval 2 hour)) as date, count(*) as edits from revision left join user_groups on rev_user = ug_user and ug_group = 'bot' where ug_user is null and rev_timestamp between 0+date_sub(@begin, interval 2 hour) and 0+date_sub(date_sub(@end, interval 2 hour), interval 1 second) group by date order by date;