Unable to apply Rules in magento

Store has thousands of Products and Catalog Price Rules. The rules weren't being applied, and after debugging cron and other things that have been a problem in the past, I took a look at the catalogrule_product_price table to see what was there. I saw a single entry:

Notice the value for rule_product_price_id -- Indeed, the max value for an INT(10) field. Reset your auto-increment and you should be good.

you change data type int(10) to bigint(15)