Zero-Downtime PostgreSQL Schema Migrations: Expand/Contract vs Blue-Green Deployment

--- title : " Zero-Downtime PostgreSQL Schema Migrations: Expand/Contract vs Blue-Green" published : true description : " A hands-on guide to two patterns for shipping PostgreSQL schema changes without downtime — with production SQL, Kotlin code, and CI/CD pipeline examples." tags : postgresql, architecture, devops, cloud canonical_url : https://blog.mvpfactory.co/zero-downtime-postgresql-schema-migrations-expand-contract-vs-blue-green --- ## What we are building By the end of this tutorial, you