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CASAN/infra/production/UPGRADE_ROLLBACK.md
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# Upgrade and Rollback Runbook
The compatibility gate is mandatory before every deployment or rollback:
```bash
bash packages/casan-harness/scripts/bash/upgrade-compatibility.sh check \
--from 1.0.0 --to 1.0.1
```
Only an explicit rule in `compatibility-matrix.json` can permit a version pair.
Before rollout, verify provenance, create and verify a state backup, smoke the
extracted artifact, deploy immutable image digests, and verify an Evidence Pack
after deployment. A rollback requires the same gate with `--rollback`, plus an
approved change record and a verified backup.
Do not infer compatibility from matching image tags, passing unit tests, or
successful container startup. Add and review a new matrix entry before any
cross-minor or cross-major migration.