Update on-call round robin for Tuesday 5 AM shift

Your on-call routing pointer can become out of date, routing alerts to the wrong engineer at shift change. It keeps on-call ownership accurate so alerts route correctly at Tuesday 5 AM handoff.

Overview

Shift-change mistakes create noisy pages and slow responses when alerts go to the wrong person. Run a scheduled pointer update each Tuesday at 5 AM to guarantee on-call ownership is current, so alerts route correctly and handoffs happen without manual reconfiguration.