diff --git a/homelab-ai-bot/monitor.py b/homelab-ai-bot/monitor.py
index bc02a4cd..02adf53f 100644
--- a/homelab-ai-bot/monitor.py
+++ b/homelab-ai-bot/monitor.py
@@ -2,11 +2,24 @@
 
 import sys
 import os
+import json
+import hashlib
 import requests
+from datetime import datetime, timezone
 
 sys.path.insert(0, os.path.dirname(__file__))
 from core import config, loki_client, proxmox_client, mail_client
 
+ALERT_STATE_FILE = os.path.join(os.path.dirname(__file__), ".alert_state.json")
+ALERT_COOLDOWN_MINUTES = {
+    "mail": 120,
+    "container": 30,
+    "ram": 30,
+    "panic": 60,
+    "silence": 60,
+    "default": 60,
+}
+
 
 def _get_tokens(cfg):
     tokens = {}
@@ -126,6 +139,63 @@ def format_report() -> str:
     return "\n".join(lines)
 
 
+def _load_alert_state() -> dict:
+    try:
+        with open(ALERT_STATE_FILE, "r") as f:
+            return json.load(f)
+    except (FileNotFoundError, json.JSONDecodeError):
+        return {}
+
+
+def _save_alert_state(state: dict):
+    try:
+        with open(ALERT_STATE_FILE, "w") as f:
+            json.dump(state, f)
+    except Exception:
+        pass
+
+
+def _alert_key(alert_text: str) -> str:
+    return hashlib.md5(alert_text.encode()).hexdigest()
+
+
+def _alert_category(alert_text: str) -> str:
+    if "📧" in alert_text or "Mail" in alert_text:
+        return "mail"
+    if "CT " in alert_text and "ist " in alert_text:
+        return "container"
+    if "RAM " in alert_text:
+        return "ram"
+    if "panic" in alert_text.lower() or "fatal" in alert_text.lower():
+        return "panic"
+    if "Keine Logs" in alert_text:
+        return "silence"
+    return "default"
+
+
+def _filter_new_alerts(alerts: list[str]) -> list[str]:
+    """Filtert bereits gemeldete Alerts. Gibt nur neue/fällige zurück."""
+    state = _load_alert_state()
+    now = datetime.now(timezone.utc).timestamp()
+    new_alerts = []
+
+    for alert in alerts:
+        key = _alert_key(alert)
+        cat = _alert_category(alert)
+        cooldown = ALERT_COOLDOWN_MINUTES.get(cat, 60) * 60
+
+        last_sent = state.get(key, {}).get("ts", 0)
+        if now - last_sent > cooldown:
+            new_alerts.append(alert)
+            state[key] = {"ts": now, "text": alert[:80], "cat": cat}
+
+    cutoff = now - 86400
+    state = {k: v for k, v in state.items() if v.get("ts", 0) > cutoff}
+
+    _save_alert_state(state)
+    return new_alerts
+
+
 def send_alert(token: str, chat_id: str, message: str):
     """Sendet eine Nachricht via Telegram."""
     requests.post(
@@ -144,8 +214,9 @@ def run_check_and_alert():
         return
 
     alerts = check_all()
-    if alerts:
-        msg = "🔧 Hausmeister-Check\n\n" + "\n".join(alerts)
+    new_alerts = _filter_new_alerts(alerts)
+    if new_alerts:
+        msg = "🔧 Hausmeister-Check\n\n" + "\n".join(new_alerts)
         send_alert(token, chat_id, msg)