Debian: Provide a friendly way to run generate in a cron job

The cron job shipped with the debian package executes sbws generate and cleanup regularly, but silently. I added a MAILTO to the cron script - but that produces a lot of output which I don't really want to read every hour, and it requires a manual change to the installed cron script. Instead, it would be great if there were a way to run the script silently if nothing noteworthy happens but with useful debug output that gets sent somewhere if an error occurred that needs to be dealt with.