This reads like a bit of a smell. I'd be pretty suspicious of why you have tasks and reminders in the first place. The question also reads like the volume of these tasks and reminders is large enough to be a problem.

You should check out the "toil" section of the Google SRE book

https://sre.google/sre-book/eliminating-toil/

> If a human operator needs to touch your system during normal operations, you have a bug.