Uses WP "pseudo-cron" system to automatically purge OpenX statistics data.
This WordPress plugin installs a new pseudo-cron process that automatically purges your OpenX statistics tables to keep only what you need. Just tell it where your OpenX database is, specify how many days of backlog you want to keep, setup maintenance schedule and you're all set.
Drop me a line on my support site to report bugs, ask for specific feature or improvement, or just tell me how you're using the plugin. It's still in an active development stage, with new features coming out on a regular basis.