Logs killing the Database & Speed

We are having problems with the size of the Logs choking the database. I have several dozen sites using this plugin for the past year and some sites’ database has grown from 35mb-ish to nearly a Gigabyte all due to the massive amount of log entries.

The only way to fix this is to manually log into each site and manually Delete All records. This is not an acceptable process.

We need a way to limit the size either by Date or # of entries. Please advise.