Let's create a meta ticket so we can have a list of things that can take advantage of the DC switchover from a DB point of view
Feel free to add/remove tasks as needed.
Depending on the amount of time we keep eqiad on sby we'd need to decide which of these tasks get done first
Recap of things to do: https://wikitech.wikimedia.org/wiki/Switch_Datacenter/planned_db_maintenance