Hi Robin!
AFAIK there are no performance boosts/losses for using smaller/larger INT(n) sizes, the only thing that happens is that you need to sort them out if you get bigger numbers than that. Could we just set all of them to INT(11) as the maximum ? (that's the largest value that makes any difference [-2147483648] as well as the default for 'INT').
I concur with that. +1 on changing it to INT(11) from the History-BIGINT-guy. ;)
Regards, Garvin.