Deploy & switch 2 obs portal instances
Using k8s, it seems easy to have a second obs portal instance (obs-beta.jmmc.fr) with a dedicated database.
It will allow upgrading the database and import data into this master/slave database : long task (few hours). Switching database on k8s pods (public / beta) will provide immediate upgrade. Finally it will help recreating a complete database with minimal service interruption (restart pod)