I'm guessing that this has been done before, so I thought I'd ask before recreating the wheel. Has anyone created a script that, given a batch number, cancels all unsent work units in that batch. I envision this querying the database to create a list of work units with batch=x and server_state=2, then for each work unit in the list, setting server_state=5, outcome=5, error_mask=error_mask|16, and transition_time=whatever the current time is. I'm new to mysql programming, so pointers would be very helpful. Thanks!