Blue-Turquoise-Green deployment – zero downtime during database schema changes (blog.dixo.net)

I was trying to describe how to manage blue-green deployments but running on a common data store with zero downtime. The TL;DR version is that you deploy a 'turquoise' intermediate version which is forwards compatible with schema changes required by the next release.

Hopefully someone else will find this a useful shorthand for describing this approach!