Using optimized DBs requires change in an approach. And this change requires using adequate data structures. In this case an array as this is the only one data structure available which supports traversing. As you do not will to use arrays for other reasons then you know the solution already.

LubomirK

Checking values one by one and if the value is out of range then fix it. 

BTW, It's also possible to craft custom timers which have this fixing functionality built-in.