diff --git a/src/static/dashboard.html b/src/static/dashboard.html
index 41e54c7..ef7838e 100644
--- a/src/static/dashboard.html
+++ b/src/static/dashboard.html
@@ -420,7 +420,7 @@
                     <div class="form-group conditional-field" id="refresh-interval-field">
                         <label for="inc-refresh-value" data-i18n="modal.field.interval">Intervall</label>
                         <div class="interval-input-group">
-                            <input type="number" id="inc-refresh-value" min="10" value="15">
+                            <input type="number" id="inc-refresh-value" min="30" value="30">
                             <select id="inc-refresh-unit" onchange="updateIntervalMin()">
                                 <option value="1" selected data-i18n="modal.unit.minutes">Minuten</option>
                                 <option value="60" data-i18n="modal.unit.hours">Stunden</option>
@@ -428,6 +428,7 @@
                                 <option value="10080" data-i18n="modal.unit.weeks">Wochen</option>
                             </select>
                         </div>
+                        <div class="form-hint" id="interval-min-hint" style="display:none;"></div>
                     </div>
                     <div class="form-group conditional-field" id="refresh-starttime-field">
                         <label for="inc-refresh-starttime"><span data-i18n="modal.field.start_time">Erste Aktualisierung um</span> <span class="info-icon tooltip-below" data-tooltip="Legt den Startzeitpunkt fest. Danach wird im eingestellten Intervall aktualisiert."><svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><path d="M12 16v-4"/><path d="M12 8h.01"/></svg></span></label>
diff --git a/src/static/js/app.js b/src/static/js/app.js
index 8d8a552..ed8ad9e 100644
--- a/src/static/js/app.js
+++ b/src/static/js/app.js
@@ -578,8 +578,16 @@ const App = {
     // Telegram-Kategorien Toggle
     const tgCheckbox = document.getElementById('inc-telegram');
     if (tgCheckbox) {
-
+        tgCheckbox.addEventListener('change', () => updateIntervalMin());
     }
+    { const xCheckbox = document.getElementById('inc-x');
+      if (xCheckbox) xCheckbox.addEventListener('change', () => updateIntervalMin()); }
+    { const ivInput = document.getElementById('inc-refresh-value');
+      if (ivInput) ivInput.addEventListener('change', () => {
+        const u = parseInt(document.getElementById('inc-refresh-unit').value);
+        const m = (u === 1) ? _getMinIntervalMinutes() : 1;
+        if (isNaN(parseInt(ivInput.value)) || parseInt(ivInput.value) < m) ivInput.value = m;
+      }); }
 
 
         // Feedback
@@ -1836,9 +1844,9 @@ const App = {
     // === Event Handlers ===
 
     _getFormData() {
-        const value = parseInt(document.getElementById('inc-refresh-value').value) || 15;
+        const value = parseInt(document.getElementById('inc-refresh-value').value) || 30;
         const unit = parseInt(document.getElementById('inc-refresh-unit').value) || 1;
-        const interval = Math.max(10, Math.min(10080, value * unit));
+        const interval = Math.max(_getMinIntervalMinutes(), Math.min(10080, value * unit));
         return {
             title: document.getElementById('inc-title').value.trim(),
             description: document.getElementById('inc-description').value.trim() || null,
@@ -2294,6 +2302,7 @@ async handleRefresh() {
         updateSourcesHint();
         toggleTypeDefaults(true);
         toggleRefreshInterval();
+        updateIntervalMin();
 
         // Modal-Titel und Submit ändern
         { const _e = document.getElementById('modal-new-title'); if (_e) _e.textContent = (typeof T === 'function') ? T('modal.new_incident.edit_title', 'Lage bearbeiten') : 'Lage bearbeiten'; }
@@ -3633,6 +3642,7 @@ function openModal(id) {
         document.getElementById('inc-notify-status-change').checked = false;
         toggleTypeDefaults();
         toggleRefreshInterval();
+        updateIntervalMin();
     }
     const modal = document.getElementById(id);
     modal._previousFocus = document.activeElement;
@@ -3814,17 +3824,38 @@ function toggleRefreshInterval() {
     if (startField) startField.classList.toggle('visible', mode === 'auto');
 }
 
+function _getMinIntervalMinutes() {
+    // Mindest-Intervall (Minuten) je nach Quellen: 30 Basis, 45 bei X oder Telegram, 60 bei beiden. International zaehlt nicht.
+    const tg = document.getElementById('inc-telegram');
+    const x = document.getElementById('inc-x');
+    const tgOn = !!(tg && tg.checked);
+    const xOn = !!(x && x.checked);
+    if (tgOn && xOn) return 60;
+    if (tgOn || xOn) return 45;
+    return 30;
+}
+
 function updateIntervalMin() {
     const unit = parseInt(document.getElementById('inc-refresh-unit').value);
     const input = document.getElementById('inc-refresh-value');
+    const minMinutes = _getMinIntervalMinutes();
+    const hint = document.getElementById('interval-min-hint');
     if (unit === 1) {
-        // Minuten: Minimum 10
-        input.min = 10;
-        if (parseInt(input.value) < 10) input.value = 10;
+        // Minuten: dynamisches Minimum (30 / 45 bei X oder Telegram / 60 bei beiden)
+        input.min = minMinutes;
+        if (isNaN(parseInt(input.value)) || parseInt(input.value) < minMinutes) input.value = minMinutes;
+        if (hint) {
+            let zusatz = '';
+            if (minMinutes === 45) zusatz = ' (X oder Telegram aktiv)';
+            else if (minMinutes === 60) zusatz = ' (X und Telegram aktiv)';
+            hint.textContent = 'Mindestens ' + minMinutes + ' Minuten' + zusatz;
+            hint.style.display = '';
+        }
     } else {
-        // Stunden/Tage/Wochen: Minimum 1
+        // Stunden/Tage/Wochen: eine Einheit liegt ueber jedem Minuten-Minimum
         input.min = 1;
-        if (parseInt(input.value) < 1) input.value = 1;
+        if (isNaN(parseInt(input.value)) || parseInt(input.value) < 1) input.value = 1;
+        if (hint) hint.style.display = 'none';
     }
 }