Irreversible Migration
Kind: anti-pattern
Layer: Enforcement Core
Record: architecture:irreversible-migration
Severity: discouraged
Scope: contract_compatibility, architecture_evolution
Formed by: Apply schema, data, or infrastructure changes that cannot safely run alongside old versions or be rolled back.
Canonical: Ontology
A defect in which a schema or data change can neither run beside the old version nor be rolled back.
Listed in Architecture principles, after Big-Bang Release and before Big-Upfront Frozen Architecture.