Rollback a Deployment

When rolling back a deployment:

1. Confirm the issue is caused by the deployment, not an unrelated outage.
2. Execute the rollback: redeploy the previous known-good version or switch traffic back to the old deployment.
3. Verify the rollback: check the health endpoint, error rates, and critical user flows.
4. If there are database migrations that need reverting, run the down migration carefully.
5. Notify the team that a rollback occurred and why.
6. Investigate the root cause on the failed deployment branch. Do not re-deploy until the issue is understood and fixed.