chore: initialize from backend template 0a6dd0e

2026-08-13 20:31:02 +09:00
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+---
+title: Runbook — DB_UNAVAILABLE (데이터베이스 연결 불가)
+category: TRANSIENT_DEPENDENCY
+error_codes: [DB_UNAVAILABLE]
+severity: P1
+owner: oncall
+last_updated: 2026-06-15
+status: stub
+---
+
+# Runbook: DB_UNAVAILABLE (`runbook://db/unavailable`)
+
+## Symptoms
+
+- HTTP 503 with `error.code=DB_UNAVAILABLE`
+- SQLState 08* connection errors in logs
+
+## Diagnosis
+
+- Check DB server health and connection pool exhaustion
+- Review network connectivity from app pods to DB
+
+## Action
+
+- Check DB primary health; failover to replica if available
+- Drain connection pool and reconnect
+
+## Escalation
+
+- P1: immediate if DB primary is down
+
+---
+
+> **Stub**: Phase D2 — author body after domain adoption. (feature-operational-runbook-contract D9)