chore: initialize from backend template 0a6dd0e

2026-08-13 20:31:02 +09:00
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+---
+title: Runbook — DB_SERIALIZATION_FAILURE (직렬화 실패)
+category: CONFLICT
+error_codes: [DB_SERIALIZATION_FAILURE]
+severity: P3
+owner: oncall
+last_updated: 2026-06-15
+status: stub
+---
+
+# Runbook: DB_SERIALIZATION_FAILURE (`runbook://db/serialization-failure`)
+
+## Symptoms
+
+- HTTP 409 with `error.code=DB_SERIALIZATION_FAILURE`
+- SQLState 40001; high concurrent transaction contention
+
+## Diagnosis
+
+- Check DB transaction isolation level
+- Identify hot rows / hot tables under high concurrency
+
+## Action
+
+- Client should retry with exponential backoff (retryable=true)
+- Optimize transaction scope if spike is sustained
+
+## Escalation
+
+- Escalate to DBA if sustained serialization failure rate > 5%
+
+---
+
+> **Stub**: Phase D2 — author body after domain adoption. (feature-operational-runbook-contract D9)