One of the linked pieces in the Neon blog post is from Knock, where we pulled off a practically zero downtime migration: https://knock.app/blog/zero-downtime-po

One of the linked pieces in the Neon blog post is from Knock, where we pulled off a practically zero downtime migration: https://knock.app/blog/zero-downtime-postgres-upgrades https://knock.app/blog/zero-downtime-postgres-upgrades In that post we walk through all the steps we took to go from Postgres 11.9 to 15.3.