How to purge data from spotlight_perfdata table in SpotlightStatisticsRepositor database

Hi,

We have setup "store alarms in the repository for 30 days" and "store Playback data for 14 days". But, while I am executing "Select top 10 * from spotlight_perfdata" in SpotlightStatisticsRepositor database, it's given data for three years.

Could you please let me how to purge data from spotlight_perfdata table in SpotlightStatisticsRepositor database.