Deployment

Zero-Downtime Deploy

1. Build new version
2. Run database migrations (backward-compatible)
3. Deploy new containers alongside old
4. Health check new containers
5. Switch traffic to new containers
6. Remove old containers

Rollback Procedure

1. Stop new containers
2. Revert to previous image tag
3. Run rollback migration if needed
4. Verify health
5. Post-mortem