atlas-migrations

Overview

Atlas manages and migrates database schemas as code - define the desired schema and Atlas plans, lints, tests, and applies the changes (per atlasgo.io/getting-started). Two operating modes:

1. Declarative - define desired state in HCL or SQL; Atlas computes diff and applies (atlas schema apply).
2. Versioned - Atlas generates timestamped migration files from schema diffs (atlas migrate diff); migrations apply forward (atlas migrate apply).

Most production teams use versioned mode for the audit trail; dev loops often use declarative mode for fast iteration.