This is just a meta task to group and track all the DB stuff that might need to happen during the next DC failover.
Not sorted in any way, just grouping them here for now.
Mediawiki: Wednesday, September 12th 2018: 14:00 UTC
Mediawiki: Wednesday, October 10th 2018: 14:00 UTC
DB planning: https://wikitech.wikimedia.org/wiki/Switch_Datacenter/planned_db_maintenance#2018_Switch_Datacenter