diff --git a/homelab-ai-bot/core/mail_client.py b/homelab-ai-bot/core/mail_client.py
index 3c6010fd5..929afc9cd 100644
--- a/homelab-ai-bot/core/mail_client.py
+++ b/homelab-ai-bot/core/mail_client.py
@@ -199,6 +199,23 @@ MARKETING_FROM_PATTERNS = [
     "promotion@", "promo@", "no-reply@mail.",
 ]
 
+# Booking.com: noreply@ mischt echte Buchungsmails mit Genius-/Rabatt-Spam.
+BOOKING_REAL_SUBJECT = [
+    "confirmation", "confirmed", "bestaetigung", "bestätigung", "buchung",
+    "reservation", "reservierung", "booking number", "buchungsnummer",
+    "cancelled", "canceled", "storn", "modified", "geändert", "geaendert",
+    "new message", "neue nachricht", "guest message", "nachricht von",
+    "payment", "zahlung", "invoice", "rechnung", "receipt", "beleg",
+    "check-in", "checkin", "pin code", "türcode", "tuercode", "door code",
+    "cancellation", "refund", "erstattung",
+]
+BOOKING_MARKETING_SUBJECT = [
+    "genius", "discount", "rabatt", "deal", "angebot", "% off", "%off",
+    "extending", "fancy", "inspired", "wishlist", "save on", "sparen",
+    "reminder:", "ready to use", "special offer", "last chance",
+    "you might like", "entdecken", "explore", "trip ideas",
+]
+
 
 def _is_marketing_mail(frm_lower: str) -> bool:
     """Werbemails von sonst wichtigen Absendern (z.B. booking.com campaign@)."""
@@ -210,6 +227,19 @@ def _is_spam_sender(frm_lower: str) -> bool:
     return any(s in frm_lower for s in SPAM_SENDERS)
 
 
+def _is_booking_noise(frm_lower: str, subj_lower: str) -> bool:
+    """Booking.com Marketing ausfiltern; echte Buchungs-/Gast-Mails behalten."""
+    if "booking.com" not in frm_lower:
+        return False
+    if any(p in subj_lower for p in BOOKING_REAL_SUBJECT):
+        return False
+    if any(p in subj_lower for p in BOOKING_MARKETING_SUBJECT):
+        return True
+    if "noreply@" in frm_lower or "campaign@" in frm_lower or "email.campaign@" in frm_lower:
+        return True
+    return False
+
+
 def get_important_mails(hours: int = 24) -> list[dict]:
     """Mails von wichtigen Absendern (Bank, Hoster, etc.), Spam-Sender ausgefiltert."""
     m = _connect()
@@ -226,10 +256,13 @@ def get_important_mails(hours: int = 24) -> list[dict]:
             parsed = _parse_mail(msg_data)
             if parsed:
                 frm_lower = parsed["from"].lower()
+                subj_lower = (parsed.get("subject") or "").lower()
                 if _is_spam_sender(frm_lower):
                     continue
                 if _is_marketing_mail(frm_lower):
                     continue
+                if _is_booking_noise(frm_lower, subj_lower):
+                    continue
                 if any(s in frm_lower for s in IMPORTANT_SENDERS):
                     results.append(parsed)
         results.reverse()
diff --git a/homelab-ai-bot/monitor.py b/homelab-ai-bot/monitor.py
index bccbdc73e..623099bed 100644
--- a/homelab-ai-bot/monitor.py
+++ b/homelab-ai-bot/monitor.py
@@ -409,8 +409,9 @@ def check_all(state: dict | None = None) -> list[str]:
         mail_client.init(cfg)
         important = mail_client.get_important_mails(hours=1)
         if important and "error" not in important[0]:
-            state = _load_alert_state()
-            seen = state.get("seen_mails", {})
+            # Am gemeinsamen state-Objekt arbeiten (kein Reload/Zwischen-Save),
+            # sonst ueberschreibt run_check_and_alert() die seen_mails wieder.
+            seen = state.setdefault("seen_mails", {})
             now = datetime.now(timezone.utc).timestamp()
 
             new_mails = []
@@ -422,9 +423,7 @@ def check_all(state: dict | None = None) -> list[str]:
                     new_mails.append(m)
                     seen[fp] = now
 
-            seen = {k: v for k, v in seen.items() if now - v < 172800}
-            state["seen_mails"] = seen
-            _save_alert_state(state)
+            state["seen_mails"] = {k: v for k, v in seen.items() if now - v < 172800}
 
             if new_mails:
                 senders = [m["from"][:30] for m in new_mails]