diff --git a/apps/api/src/services/decision_manager.py b/apps/api/src/services/decision_manager.py
index 0268d2ff..87e5c8bd 100644
--- a/apps/api/src/services/decision_manager.py
+++ b/apps/api/src/services/decision_manager.py
@@ -73,6 +73,16 @@ async def _push_decision_to_telegram(
             )
             return
 
+        # 2026-04-09 Claude Code: resolved Incident 不重送 Telegram
+        # 場景: dedup TTL 過期後，已 resolve 的 Incident 仍被重新推送
+        if incident.status and str(incident.status).lower() in ("resolved", "closed"):
+            logger.info(
+                "telegram_push_skipped",
+                reason="Incident already resolved",
+                incident_id=incident.incident_id,
+            )
+            return
+
         # 🔴 靜默檢查：此資源是否被靜默 (2026-03-27 P1 優化)
         target = incident.affected_services[0] if incident.affected_services else "unknown"
         silence_key = f"telegram_silence:{target}"