It would seem like the "Administer Change Log" tab would update the Content Changes, but I was trying to line up the items that would be deleted for a particular day on the Administer tab with a search on the Content Changes tab, and I was unable to make the number of entries line up.
The only thing I've really found is at this link. I would simply recommend backing up your SLD before you make any changes.
"Caution
Do not delete entries still needed for incremental exports.If incremental export data are affected by your deletion, follow the system warnings."