Stealing cron schedules

This plugin is not correctly using the filter:

cron_schedules

It is using it like an action and not a filter.

So it is not receiving the current cron schedules, appending to the array and then returning the new array. Instead it is just creating a new array and returning it.

It is “stealing” cron schedules which other plugins/themes may have set.

http://ww.wp.xz.cn/extend/plugins/rvg-optimize-database/