Recently scheduled reminders stopped working on a site.
on investigation of error logs I found that one reminder out of several was incrrectly configured. I deleted the reminder. The next time the scheduled reminder job ran, all went well but a backlog of 3 months of event reminders sent at the same time.
I've found a similar error on another site, and have disabled scheduled reminder task while investigating and deleting the incorrectly configured reminder.
before I turn the scheduled reminder task back on, how can I stop the backlog of old reminders from sending?