Remove Scheduled Event instance logs that are older than a month

[edwinmp]

We have hundreds of them now ... This should naturally be automated.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[edwinmp]

We really don't need to be keeping the older logs. It's not a big bump to the server storage but it's still something we should handle.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.