PostgreSQL Zero-Downtime Migration: On-Prem to AWS Cloud

- This GitHub repo documents a strategy for migrating a PostgreSQL database from on-premises servers to AWS RDS (Amazon's managed database service) without taking the application offline ("zero downtime"). - The approach uses the PostgreSQL native logical replication feature (publications and subscriptions) to keep the on-prem and cloud databases in sync while the migration runs. - After catch-up, a brief cutover switches the app to the cloud database; the repo covers schema migration, replication setup, monitoring, and rollback plans. - Why it matters: Database migrations are high-risk operations; for businesses that can't afford minutes of downtime (e.g., e-commerce, finance), zero-downtime methods are critical. AWS RDS reduces operational overhead compared to self-managed PostgreSQL.