diff --git a/apps/api/src/services/decision_manager.py b/apps/api/src/services/decision_manager.py
index 5d2f2dc2..72bad999 100644
--- a/apps/api/src/services/decision_manager.py
+++ b/apps/api/src/services/decision_manager.py
@@ -1188,6 +1188,18 @@ class DecisionManager:
         """
         _redis_client = get_redis()
 
+        # 1. 先檢查現有 token（所有類型統一入口）
+        # 2026-04-16 ogt + Claude Sonnet 4.6: 修復 TYPE-1 bypass 未檢查 existing token 導致
+        # HostBackupFailed 等告警重複洗版 — existing token 檢查必須在 TYPE-1 bypass 前執行
+        existing_token = await self._find_existing_token(incident.incident_id)
+        if existing_token:
+            # READY 或 EXECUTING 狀態: 直接返回
+            if existing_token.state in (DecisionState.READY, DecisionState.EXECUTING):
+                return existing_token
+            # COMPLETED 狀態: 直接返回，避免重複建立 decision 導致 Telegram 轟炸
+            if existing_token.state == DecisionState.COMPLETED:
+                return existing_token
+
         # ADR-073 Phase 3-1: TYPE-1 triage guard — 純資訊告警跳過 LLM 分析
         # classify_alert_early() 已在 webhook 入口設定 notification_type
         # TYPE-1 (info/backup/heartbeat) 不需 AI 推理，直接推 Telegram 後返回
@@ -1207,7 +1219,9 @@ class DecisionManager:
                     "description": "純資訊通知，無需操作",
                 },
             )
-            await self._save_token(_info_token)
+            # 2026-04-16 ogt + Claude Sonnet 4.6: TYPE-1 token TTL 24h 防洗版
+            # 原 3600s 導致每小時重推同一 HostBackupFailed/TYPE-1 告警
+            await self._save_token(_info_token, ttl=86400)
             _fire_and_forget(_push_decision_to_telegram(incident, _info_token.proposal_data))
             logger.info(
                 "decision_type1_bypass",
@@ -1216,16 +1230,6 @@ class DecisionManager:
             )
             return _info_token
 
-        # 1. 檢查現有 token
-        existing_token = await self._find_existing_token(incident.incident_id)
-        if existing_token:
-            # READY 或 EXECUTING 狀態: 直接返回
-            if existing_token.state in (DecisionState.READY, DecisionState.EXECUTING):
-                return existing_token
-            # COMPLETED 狀態: 直接返回，避免重複建立 decision 導致 Telegram 轟炸
-            if existing_token.state == DecisionState.COMPLETED:
-                return existing_token
-
         # 2. 建立新 token
         token = DecisionToken(
             token=f"DEC-{uuid4().hex[:12].upper()}",
@@ -2383,8 +2387,12 @@ class DecisionManager:
         except Exception as e:
             logger.warning("decision_chain_persist_failed", incident_id=incident_id, error=str(e))
 
-    async def _save_token(self, token: DecisionToken) -> None:
-        """儲存決策令牌到 Redis"""
+    async def _save_token(self, token: DecisionToken, ttl: int = DECISION_TOKEN_TTL) -> None:
+        """儲存決策令牌到 Redis
+
+        ttl: 過期秒數，預設 DECISION_TOKEN_TTL (3600s)
+             TYPE-1 純資訊通知使用 86400s (24h) 防重複洗版
+        """
         import json
         redis_client = get_redis()
         key = f"{DECISION_TOKEN_PREFIX}{token.token}"
@@ -2392,7 +2400,7 @@ class DecisionManager:
         await redis_client.set(
             key,
             json.dumps(token.to_dict()),
-            ex=DECISION_TOKEN_TTL,
+            ex=ttl,
         )
 
     async def get_token(self, token_id: str) -> DecisionToken | None: