diff --git a/docs/adr/ADR-053-observability-signoz-unified-architecture.md b/docs/adr/ADR-053-observability-signoz-unified-architecture.md
index 63dfa9dd..30ad8244 100644
--- a/docs/adr/ADR-053-observability-signoz-unified-architecture.md
+++ b/docs/adr/ADR-053-observability-signoz-unified-architecture.md
@@ -120,7 +120,7 @@ Warning/Error Event 全量保留。Normal/Scheduled/Pulling/Pulled/Created/Start
 - [x] SigNoz 指標流入 (OTEL Collector prometheus receiver: node + kube-state)
 - [x] Alert Chain Smoke Test 7/8 PASSED (1 non-critical: 指標剛啟動)
 - [x] CD Pipeline 整合 Alert Chain Smoke Test + Sentry Token 注入
-- [ ] ClickHouse TTL 設定 (待 .188 操作: signoz_logs 30天 / signoz_metrics 90天)
+- [x] ClickHouse TTL 設定完成 — signoz_logs 30天 (已內建) / signoz_metrics 90天 (8表已修改)
 - [x] ~~Prometheus remote_write~~ → 改用 OTEL Collector federation scrape (SigNoz 不支援 remote_write 格式)
 
 ---