rails-migration-safety

What problem does it solve?

Zero-downtime migrations require careful coordination so that old and new schema coexist during deploys, preventing outages and data loss.

Core Features & Use Cases

• Safe multi-step migration patterns for zero-downtime deployments in AFAL Rails apps.
• Batched data migrations with safeguards such as disable_ddl_transaction! and throttling to minimize DB load.
• Strategies for adding, renaming, or removing columns and indexes safely in multi-tenant environments.

Quick Start

Follow a four-step pattern: add a nullable interim column, perform batched backfills, switch reads to the new column while validating data integrity, and finally remove the old column.