In an effort to reduce surprises and potential mishaps it is now required to include any long running tasks in the deployment calendar[0].
"Long running tasks" include any script that is run on production 'work machines' such as terbium that last for longer than ~1 hour. Think: migration and maintenance scripts.
This was discussed and proposed in T144661[1].
Best,
Greg
[0] https://wikitech.wikimedia.org/wiki/Deployments Relevant diff: https://wikitech.wikimedia.org/w/index.php?diff=850923&oldid=850244 [1] https://phabricator.wikimedia.org/T144661