tech-log-backend/docs/runbooks/db-unavailable.md

title, category, error_codes, severity, owner, last_updated, status

title	category	error_codes	severity	owner	last_updated	status
Runbook — DB_UNAVAILABLE (데이터베이스 연결 불가)	TRANSIENT_DEPENDENCY	DB_UNAVAILABLE	P1	oncall	2026-06-15	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

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Stub: Phase D2 — author body after domain adoption. (feature-operational-runbook-contract D9)