init: 클린 아키텍처 백엔드

docs/runbooks/migration-failed.md

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+---
+title: Runbook — MIGRATION_FAILED (DB 마이그레이션 실패)
+category: INTERNAL
+error_codes: [MIGRATION_FAILED]
+severity: P1
+owner: oncall
+last_updated: 2026-06-15
+status: stub
+---
+
+# Runbook: MIGRATION_FAILED (`runbook://migration/failed`)
+
+## Symptoms
+
+- Container exits with code 70 (migration failure exit)
+- Structured log with `error.code=MIGRATION_FAILED`, `startup.phase=migration`
+- App refuses to start (fail-fast)
+
+## Diagnosis
+
+- Check Flyway migration log for which script failed and why
+- Review latest migration script for SQL errors
+
+## Action
+
+- Fix migration script or roll back to previous migration version
+- Run migration manually in repair mode if checksum mismatch
+
+## Escalation
+
+- P1 immediate: app cannot start until migration is resolved
+
+---
+
+> **Stub**: Phase D2 — author body after domain adoption. (feature-operational-runbook-contract D9)