It is neither hard to write a sql statement to update the counters nor is it difficult to schedule this with the service agent.
Under management in enterprise manager select jobs.
Right click jobs and select new job.
Give it a name.
Make Step 1 your sql statement that updates the counters.
Give Step 1 a name.
Go to the schedule tab. Make this run every day, once, at 12:00am with no end date.