diff --git a/src/models.py b/src/models.py
index 072198c..ae51f2d 100644
--- a/src/models.py
+++ b/src/models.py
@@ -36,7 +36,7 @@ class LicenseParams(BaseModel):
     token_budget_usd: Optional[float] = None
     credits_total: Optional[int] = None
     cost_per_credit: Optional[float] = None
-    budget_warning_percent: Optional[int] = Field(default=80, ge=1, le=100)
+    budget_warning_percent: Optional[int] = Field(default=80, ge=0, le=100)  # 0 = Warnung aus
     unlimited_budget: bool = False
     # 'monthly' = Kontingent wird zum Monatswechsel neu gefuellt (der Monitor
     # setzt den Verbrauch traege zurueck), 'total' = gilt fuer die Laufzeit.
diff --git a/src/routers/token_usage.py b/src/routers/token_usage.py
index 7996fca..4a19671 100644
--- a/src/routers/token_usage.py
+++ b/src/routers/token_usage.py
@@ -196,8 +196,8 @@ async def update_budget(license_id: int, data: dict, request: Request, admin=Dep
                 pct = int(data["budget_warning_percent"])
             except (TypeError, ValueError):
                 raise HTTPException(status_code=400, detail="budget_warning_percent muss eine Zahl sein")
-            if not 1 <= pct <= 100:
-                raise HTTPException(status_code=400, detail="budget_warning_percent muss zwischen 1 und 100 liegen")
+            if not 0 <= pct <= 100:
+                raise HTTPException(status_code=400, detail="budget_warning_percent muss zwischen 0 und 100 liegen (0 = Warnung aus)")
             data["budget_warning_percent"] = pct
         if "max_users" in data:
             try:
diff --git a/src/static/dashboard.html b/src/static/dashboard.html
index 71a9b19..8216a20 100644
--- a/src/static/dashboard.html
+++ b/src/static/dashboard.html
@@ -263,8 +263,8 @@
                     </label>
                   </div>
                   <div class="form-group">
-                    <label for="editWarnPercent">Warnschwelle (%)</label>
-                    <input type="number" id="editWarnPercent" min="1" max="100" placeholder="80">
+                    <label for="editWarnPercent">Warnschwelle (%, 0 = aus)</label>
+                    <input type="number" id="editWarnPercent" min="0" max="100" placeholder="80">
                   </div>
                   <details class="adv-section">
                     <summary>
@@ -625,8 +625,8 @@
               </label>
             </div>
             <div class="form-group">
-              <label for="newOrgLicWarnPercent">Warnschwelle (%)</label>
-              <input type="number" id="newOrgLicWarnPercent" value="80" min="1" max="100">
+              <label for="newOrgLicWarnPercent">Warnschwelle (%, 0 = aus)</label>
+              <input type="number" id="newOrgLicWarnPercent" value="80" min="0" max="100">
             </div>
             <div class="form-group">
               <label for="newOrgLicCostPerCredit">Kosten pro Credit (USD)</label>
@@ -724,8 +724,8 @@
             </label>
           </div>
           <div class="form-group">
-            <label for="newLicWarnPercent">Warnschwelle (%)</label>
-            <input type="number" id="newLicWarnPercent" value="80" min="1" max="100">
+            <label for="newLicWarnPercent">Warnschwelle (%, 0 = aus)</label>
+            <input type="number" id="newLicWarnPercent" value="80" min="0" max="100">
           </div>
           <div class="form-group">
             <label for="newLicCostPerCredit">Kosten pro Credit (USD)</label>
@@ -1162,7 +1162,7 @@
   </div>
 
   <script src="/static/js/a11y.js?v=20260725a"></script>
-  <script src="/static/js/app.js?v=20260725j"></script>
+  <script src="/static/js/app.js?v=20260725k"></script>
   <script src="/static/js/sources.js?v=20260522x2"></script>
   <script src="/static/js/x-scraper.js?v=20260522a"></script>
   <script src="/static/js/source-health.js?v=20260509l"></script>
diff --git a/src/static/js/app.js b/src/static/js/app.js
index 0d6e7cd..6a2321e 100644
--- a/src/static/js/app.js
+++ b/src/static/js/app.js
@@ -561,7 +561,6 @@ async function loadOrgLicenses(orgId) {
         <td>
           ${l.status === "active" ? `
             <button class="btn btn-secondary btn-small" onclick="extendLicense(${l.id})">Verlängern</button>
-            <button class="btn btn-danger btn-small" onclick="confirmRevokeLicense(${l.id})">Widerrufen</button>
           ` : ""}
         </td>
       </tr>
@@ -602,20 +601,9 @@ document.addEventListener("DOMContentLoaded", function () {
   });
 });
 
-function confirmRevokeLicense(licId) {
-  showConfirm(
-    "Lizenz widerrufen",
-    "Soll die Lizenz wirklich widerrufen werden? Nutzer können dann nur noch lesen.",
-    async () => {
-      try {
-        await API.put(`/api/licenses/${licId}/revoke`);
-        if (currentOrgId) loadOrgLicenses(currentOrgId);
-      } catch (err) {
-        showToast(err.message, "error");
-      }
-    }
-  );
-}
+// Der Widerrufen-Knopf ist bewusst entfernt. Eine neue Lizenz widerruft die
+// alte automatisch, und einen Kunden abschalten erledigt der Org-Status-
+// Umschalter in der Kopfzeile. Der API-Endpoint /revoke bleibt bestehen.
 
 // --- Expiring Licenses (global view) ---
 async function loadExpiringLicenses() {
diff --git a/tests/test_models.py b/tests/test_models.py
index 0da0ca0..05a7d47 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -54,6 +54,13 @@ def test_license_params_credits_defaults():
     assert p.budget_warning_percent == 80
 
 
+def test_license_params_warnschwelle_null_ist_aus():
+    p = LicenseParams(license_type="trial", budget_warning_percent=0)
+    assert p.budget_warning_percent == 0
+    with pytest.raises(ValidationError):
+        LicenseParams(license_type="trial", budget_warning_percent=101)
+
+
 def test_license_params_period_pattern():
     LicenseParams(license_type="trial", credits_period="monthly")
     LicenseParams(license_type="trial", credits_period="total")