diff --git a/backend/routers/prompts.py b/backend/routers/prompts.py
index 5e7d76f..8112ece 100644
--- a/backend/routers/prompts.py
+++ b/backend/routers/prompts.py
@@ -103,6 +103,156 @@ def list_placeholders_endpoint(session: dict=Depends(require_auth)):
     return get_placeholder_catalog(profile_id)
 
 
+@router.get("/export-all")
+def export_all_prompts(session: dict = Depends(require_admin)):
+    """
+    Export all prompts as JSON array.
+    Admin only. Used for backup and dev→prod sync.
+
+    IMPORTANT: Must be defined BEFORE /{prompt_id} route to avoid routing conflict.
+    """
+    from datetime import datetime
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute("SELECT * FROM ai_prompts ORDER BY sort_order, slug")
+        prompts = [r2d(row) for row in cur.fetchall()]
+
+    # Convert to export format (clean up DB-specific fields)
+    export_data = []
+    for p in prompts:
+        export_item = {
+            'slug': p['slug'],
+            'name': p['name'],
+            'display_name': p.get('display_name'),
+            'description': p.get('description'),
+            'type': p.get('type', 'pipeline'),
+            'category': p.get('category', 'ganzheitlich'),
+            'template': p.get('template'),
+            'stages': p.get('stages'),
+            'output_format': p.get('output_format', 'text'),
+            'output_schema': p.get('output_schema'),
+            'question_augmentations': p.get('question_augmentations'),
+            'graph_data': p.get('graph_data'),
+            'active': p.get('active', True),
+            'sort_order': p.get('sort_order', 0)
+        }
+        export_data.append(export_item)
+
+    return {
+        'export_date': datetime.now().isoformat(),
+        'count': len(export_data),
+        'prompts': export_data
+    }
+
+
+@router.post("/import")
+def import_prompts(
+    data: dict,
+    overwrite: bool = False,
+    session: dict = Depends(require_admin)
+):
+    """
+    Import prompts from JSON export.
+
+    Args:
+        data: Export data from /export-all endpoint
+        overwrite: If true, update existing prompts. If false, skip duplicates.
+
+    Returns:
+        Summary of import results (created, updated, skipped)
+
+    IMPORTANT: Must be defined BEFORE /{prompt_id} route to avoid routing conflict.
+    """
+    if 'prompts' not in data:
+        raise HTTPException(400, "Invalid import data: missing 'prompts' key")
+
+    prompts = data['prompts']
+    created = 0
+    updated = 0
+    skipped = 0
+    errors = []
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+
+        for p in prompts:
+            slug = p.get('slug')
+            if not slug:
+                errors.append('Prompt without slug skipped')
+                continue
+
+            # Check if exists
+            cur.execute("SELECT id FROM ai_prompts WHERE slug=%s", (slug,))
+            existing = cur.fetchone()
+
+            if existing and not overwrite:
+                skipped += 1
+                continue
+
+            # Prepare JSON fields if present
+            stages_json = None
+            if p.get('stages'):
+                stages_json = json.dumps(p['stages']) if isinstance(p['stages'], list) else p['stages']
+
+            output_schema_json = None
+            if p.get('output_schema'):
+                output_schema_json = json.dumps(p['output_schema']) if isinstance(p['output_schema'], dict) else p['output_schema']
+
+            question_aug_json = None
+            if p.get('question_augmentations'):
+                question_aug_json = json.dumps(p['question_augmentations']) if isinstance(p['question_augmentations'], (dict, list)) else p['question_augmentations']
+
+            graph_data_json = None
+            if p.get('graph_data'):
+                graph_data_json = json.dumps(p['graph_data']) if isinstance(p['graph_data'], dict) else p['graph_data']
+
+            if existing:
+                # Update existing
+                cur.execute("""
+                    UPDATE ai_prompts SET
+                        name=%s, display_name=%s, description=%s, type=%s,
+                        category=%s, template=%s, stages=%s, output_format=%s,
+                        output_schema=%s, question_augmentations=%s, graph_data=%s,
+                        active=%s, sort_order=%s,
+                        updated=CURRENT_TIMESTAMP
+                    WHERE slug=%s
+                """, (
+                    p.get('name'), p.get('display_name'), p.get('description'),
+                    p.get('type', 'pipeline'), p.get('category', 'ganzheitlich'),
+                    p.get('template'), stages_json, p.get('output_format', 'text'),
+                    output_schema_json, question_aug_json, graph_data_json,
+                    p.get('active', True), p.get('sort_order', 0), slug
+                ))
+                updated += 1
+            else:
+                # Create new
+                cur.execute("""
+                    INSERT INTO ai_prompts (
+                        slug, name, display_name, description, type, category,
+                        template, stages, output_format, output_schema,
+                        question_augmentations, graph_data,
+                        active, sort_order, created, updated
+                    ) VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,CURRENT_TIMESTAMP,CURRENT_TIMESTAMP)
+                """, (
+                    slug, p.get('name'), p.get('display_name'), p.get('description'),
+                    p.get('type', 'pipeline'), p.get('category', 'ganzheitlich'),
+                    p.get('template'), stages_json, p.get('output_format', 'text'),
+                    output_schema_json, question_aug_json, graph_data_json,
+                    p.get('active', True), p.get('sort_order', 0)
+                ))
+                created += 1
+
+        conn.commit()
+
+    return {
+        'success': True,
+        'created': created,
+        'updated': updated,
+        'skipped': skipped,
+        'errors': errors if errors else None
+    }
+
+
 @router.get("/{prompt_id}")
 def get_prompt(prompt_id: str, session: dict=Depends(require_auth)):
     """Get single AI prompt by ID (UUID)."""
@@ -214,11 +364,31 @@ def duplicate_prompt(prompt_id: str, session: dict=Depends(require_admin)):
 
         new_display_name = f"{original.get('display_name') or original['name']} (Kopie)"
 
+        # Prepare JSONB fields (convert dict/list to JSON string if needed)
+        stages_json = json.dumps(original['stages']) if original.get('stages') else None
+        output_schema_json = json.dumps(original['output_schema']) if original.get('output_schema') else None
+        question_aug_json = json.dumps(original['question_augmentations']) if original.get('question_augmentations') else None
+        graph_data_json = json.dumps(original['graph_data']) if original.get('graph_data') else None
+
         cur.execute(
-            """INSERT INTO ai_prompts (id, name, slug, display_name, description, template, category, active, sort_order, created, updated)
-               VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP)""",
-            (new_id, new_name, new_slug, new_display_name, original['description'], original['template'],
-             original.get('category', 'ganzheitlich'), original['active'], original['sort_order'])
+            """INSERT INTO ai_prompts (
+                id, name, slug, display_name, description, template, category,
+                type, stages, output_format, output_schema,
+                question_augmentations, graph_data,
+                active, sort_order, created, updated
+            ) VALUES (
+                %s, %s, %s, %s, %s, %s, %s,
+                %s, %s, %s, %s,
+                %s, %s,
+                %s, %s, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
+            )""",
+            (new_id, new_name, new_slug, new_display_name,
+             original.get('description'), original.get('template'),
+             original.get('category', 'ganzheitlich'),
+             original.get('type', 'pipeline'), stages_json,
+             original.get('output_format', 'text'), output_schema_json,
+             question_aug_json, graph_data_json,
+             original.get('active', True), original.get('sort_order', 0))
         )
 
     return {"id": new_id, "slug": new_slug, "name": new_name}
@@ -1607,132 +1777,3 @@ def update_unified_prompt(prompt_id: str, p: UnifiedPromptUpdate, session: dict
         )
 
     return {"ok": True}
-
-
-@router.get("/export-all")
-def export_all_prompts(session: dict = Depends(require_admin)):
-    """
-    Export all prompts as JSON array.
-    Admin only. Used for backup and dev→prod sync.
-    """
-    from datetime import datetime
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cur.execute("SELECT * FROM ai_prompts ORDER BY sort_order, slug")
-        prompts = [r2d(row) for row in cur.fetchall()]
-
-    # Convert to export format (clean up DB-specific fields)
-    export_data = []
-    for p in prompts:
-        export_item = {
-            'slug': p['slug'],
-            'name': p['name'],
-            'display_name': p.get('display_name'),
-            'description': p.get('description'),
-            'type': p.get('type', 'pipeline'),
-            'category': p.get('category', 'ganzheitlich'),
-            'template': p.get('template'),
-            'stages': p.get('stages'),
-            'output_format': p.get('output_format', 'text'),
-            'output_schema': p.get('output_schema'),
-            'active': p.get('active', True),
-            'sort_order': p.get('sort_order', 0)
-        }
-        export_data.append(export_item)
-
-    return {
-        'export_date': datetime.now().isoformat(),
-        'count': len(export_data),
-        'prompts': export_data
-    }
-
-
-@router.post("/import")
-def import_prompts(
-    data: dict,
-    overwrite: bool = False,
-    session: dict = Depends(require_admin)
-):
-    """
-    Import prompts from JSON export.
-
-    Args:
-        data: Export data from /export-all endpoint
-        overwrite: If true, update existing prompts. If false, skip duplicates.
-
-    Returns:
-        Summary of import results (created, updated, skipped)
-    """
-    if 'prompts' not in data:
-        raise HTTPException(400, "Invalid import data: missing 'prompts' key")
-
-    prompts = data['prompts']
-    created = 0
-    updated = 0
-    skipped = 0
-    errors = []
-
-    with get_db() as conn:
-        cur = get_cursor(conn)
-
-        for p in prompts:
-            slug = p.get('slug')
-            if not slug:
-                errors.append('Prompt without slug skipped')
-                continue
-
-            # Check if exists
-            cur.execute("SELECT id FROM ai_prompts WHERE slug=%s", (slug,))
-            existing = cur.fetchone()
-
-            if existing and not overwrite:
-                skipped += 1
-                continue
-
-            # Prepare stages JSON if present
-            stages_json = None
-            if p.get('stages'):
-                stages_json = json.dumps(p['stages']) if isinstance(p['stages'], list) else p['stages']
-
-            if existing:
-                # Update existing
-                cur.execute("""
-                    UPDATE ai_prompts SET
-                        name=%s, display_name=%s, description=%s, type=%s,
-                        category=%s, template=%s, stages=%s, output_format=%s,
-                        output_schema=%s, active=%s, sort_order=%s,
-                        updated=CURRENT_TIMESTAMP
-                    WHERE slug=%s
-                """, (
-                    p.get('name'), p.get('display_name'), p.get('description'),
-                    p.get('type', 'pipeline'), p.get('category', 'ganzheitlich'),
-                    p.get('template'), stages_json, p.get('output_format', 'text'),
-                    p.get('output_schema'), p.get('active', True),
-                    p.get('sort_order', 0), slug
-                ))
-                updated += 1
-            else:
-                # Create new
-                cur.execute("""
-                    INSERT INTO ai_prompts (
-                        slug, name, display_name, description, type, category,
-                        template, stages, output_format, output_schema,
-                        active, sort_order, created, updated
-                    ) VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,CURRENT_TIMESTAMP,CURRENT_TIMESTAMP)
-                """, (
-                    slug, p.get('name'), p.get('display_name'), p.get('description'),
-                    p.get('type', 'pipeline'), p.get('category', 'ganzheitlich'),
-                    p.get('template'), stages_json, p.get('output_format', 'text'),
-                    p.get('output_schema'), p.get('active', True), p.get('sort_order', 0)
-                ))
-                created += 1
-
-        conn.commit()
-
-    return {
-        'success': True,
-        'created': created,
-        'updated': updated,
-        'skipped': skipped,
-        'errors': errors if errors else None
-    }
diff --git a/backend/workflow_executor.py b/backend/workflow_executor.py
index a516727..e5a7152 100644
--- a/backend/workflow_executor.py
+++ b/backend/workflow_executor.py
@@ -594,10 +594,20 @@ def execute_end_node(
             # AUTO mode: Concatenate all analysis_core values
             logger.debug(f"End node {node.id}: Using AUTO output mode")
 
+            # Get graph from context for node label lookup
+            graph = context.get("graph")
+
             combined_analysis = []
             for node_id, node_state in context.get("node_results", {}).items():
                 if node_state.status == NodeStatus.EXECUTED and node_state.analysis_core:
-                    combined_analysis.append(f"## {node_id}\n{node_state.analysis_core}")
+                    # Get node label from graph (fallback to node_id if not found)
+                    node_label = node_id  # default
+                    if graph:
+                        node_obj = next((n for n in graph.nodes if n.id == node_id), None)
+                        if node_obj and hasattr(node_obj, 'data') and node_obj.data:
+                            node_label = node_obj.data.get('label', node_id)
+
+                    combined_analysis.append(f"## {node_label}\n{node_state.analysis_core}")
 
             final_output = "\n\n".join(combined_analysis) if combined_analysis else "[No analysis generated]"
 
@@ -999,7 +1009,13 @@ def aggregate_results(node_states: List[NodeExecutionState], graph) -> Dict[str,
                 final_output = state.analysis_core
             else:
                 # Regular node - add to combined analysis
-                combined_analysis.append(f"## {state.node_id}\n{state.analysis_core}")
+                # Get node label from graph (fallback to node_id)
+                node_label = state.node_id  # default
+                node_obj = next((n for n in graph.nodes if n.id == state.node_id), None)
+                if node_obj and hasattr(node_obj, 'data') and node_obj.data:
+                    node_label = node_obj.data.get('label', state.node_id)
+
+                combined_analysis.append(f"## {node_label}\n{state.analysis_core}")
 
         if state.normalized_signals:
             all_signals.extend([s.model_dump() for s in state.normalized_signals])
diff --git a/frontend/src/components/workflow/WorkflowCanvas.jsx b/frontend/src/components/workflow/WorkflowCanvas.jsx
index 447d68c..930f8c4 100644
--- a/frontend/src/components/workflow/WorkflowCanvas.jsx
+++ b/frontend/src/components/workflow/WorkflowCanvas.jsx
@@ -39,6 +39,7 @@ export function WorkflowCanvas({
         className="workflow-canvas"
         minZoom={0.2}
         maxZoom={2}
+        deleteKeyCode={['Backspace', 'Delete']}
         defaultEdgeOptions={{
           animated: false,
           style: { strokeWidth: 2 },
diff --git a/frontend/src/components/workflow/panels/ValidationPanel.jsx b/frontend/src/components/workflow/panels/ValidationPanel.jsx
new file mode 100644
index 0000000..804a3e4
--- /dev/null
+++ b/frontend/src/components/workflow/panels/ValidationPanel.jsx
@@ -0,0 +1,246 @@
+import { useState } from 'react'
+import { AlertCircle, AlertTriangle, ChevronDown, ChevronRight, X } from 'lucide-react'
+
+/**
+ * ValidationPanel - Zeigt Fehler und Warnungen mit Details
+ *
+ * Features:
+ * - Aufklappbar (collapsible)
+ * - Click-to-Jump zu betroffener Node
+ * - Gruppierung nach Severity
+ * - Klare visuelle Trennung
+ */
+export function ValidationPanel({ errors, warnings, onNodeClick, onClose }) {
+  const [isExpanded, setIsExpanded] = useState(true)
+  const [showErrors, setShowErrors] = useState(true)
+  const [showWarnings, setShowWarnings] = useState(true)
+
+  const totalCount = errors.length + warnings.length
+
+  if (totalCount === 0) return null
+
+  const handleItemClick = (item) => {
+    if (item.nodeId && onNodeClick) {
+      onNodeClick(item.nodeId)
+    }
+  }
+
+  return (
+    <div style={{
+      position: 'fixed',
+      bottom: 90,
+      right: 20,
+      width: 400,
+      maxHeight: '60vh',
+      background: 'var(--surface)',
+      border: '1px solid var(--border)',
+      borderRadius: 8,
+      boxShadow: '0 4px 12px rgba(0,0,0,0.15)',
+      display: 'flex',
+      flexDirection: 'column',
+      zIndex: 100
+    }}>
+      {/* Header */}
+      <div
+        onClick={() => setIsExpanded(!isExpanded)}
+        style={{
+          padding: '12px 16px',
+          borderBottom: isExpanded ? '1px solid var(--border)' : 'none',
+          display: 'flex',
+          alignItems: 'center',
+          justifyContent: 'space-between',
+          cursor: 'pointer',
+          userSelect: 'none',
+          background: errors.length > 0 ? 'rgba(216, 90, 48, 0.1)' : 'rgba(255, 193, 7, 0.1)'
+        }}
+      >
+        <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
+          {isExpanded ? <ChevronDown size={18} /> : <ChevronRight size={18} />}
+          <AlertCircle size={18} color={errors.length > 0 ? 'var(--danger)' : '#f59e0b'} />
+          <span style={{ fontWeight: 600, fontSize: 14 }}>
+            Validierung
+          </span>
+          <span style={{ fontSize: 12, color: 'var(--text3)' }}>
+            {errors.length > 0 && `${errors.length} Fehler`}
+            {errors.length > 0 && warnings.length > 0 && ', '}
+            {warnings.length > 0 && `${warnings.length} Warnung${warnings.length > 1 ? 'en' : ''}`}
+          </span>
+        </div>
+        <button
+          onClick={(e) => {
+            e.stopPropagation()
+            onClose && onClose()
+          }}
+          style={{
+            background: 'none',
+            border: 'none',
+            cursor: 'pointer',
+            padding: 4,
+            display: 'flex',
+            alignItems: 'center'
+          }}
+        >
+          <X size={16} color="var(--text3)" />
+        </button>
+      </div>
+
+      {/* Content */}
+      {isExpanded && (
+        <div style={{
+          overflowY: 'auto',
+          maxHeight: 'calc(60vh - 60px)'
+        }}>
+          {/* Errors */}
+          {errors.length > 0 && (
+            <div>
+              <div
+                onClick={() => setShowErrors(!showErrors)}
+                style={{
+                  padding: '8px 16px',
+                  background: 'rgba(216, 90, 48, 0.05)',
+                  display: 'flex',
+                  alignItems: 'center',
+                  gap: 8,
+                  cursor: 'pointer',
+                  userSelect: 'none',
+                  borderBottom: '1px solid var(--border)'
+                }}
+              >
+                {showErrors ? <ChevronDown size={16} /> : <ChevronRight size={16} />}
+                <AlertCircle size={16} color="var(--danger)" />
+                <span style={{ fontWeight: 600, fontSize: 13, color: 'var(--danger)' }}>
+                  Fehler ({errors.length})
+                </span>
+              </div>
+              {showErrors && (
+                <div>
+                  {errors.map((error, idx) => (
+                    <div
+                      key={idx}
+                      onClick={() => handleItemClick(error)}
+                      style={{
+                        padding: '10px 16px',
+                        borderBottom: idx < errors.length - 1 ? '1px solid var(--border)' : 'none',
+                        cursor: error.nodeId ? 'pointer' : 'default',
+                        background: error.nodeId ? 'transparent' : 'transparent',
+                        transition: 'background 0.15s',
+                      }}
+                      onMouseEnter={(e) => {
+                        if (error.nodeId) e.currentTarget.style.background = 'rgba(216, 90, 48, 0.05)'
+                      }}
+                      onMouseLeave={(e) => {
+                        e.currentTarget.style.background = 'transparent'
+                      }}
+                    >
+                      <div style={{
+                        fontSize: 13,
+                        color: 'var(--text1)',
+                        marginBottom: 4
+                      }}>
+                        {error.message}
+                      </div>
+                      {error.nodeId && (
+                        <div style={{
+                          fontSize: 11,
+                          color: 'var(--text3)',
+                          fontFamily: 'monospace'
+                        }}>
+                          → Klicken um zu Node zu springen
+                        </div>
+                      )}
+                      {error.type && (
+                        <div style={{
+                          fontSize: 10,
+                          color: 'var(--text3)',
+                          marginTop: 4,
+                          textTransform: 'uppercase'
+                        }}>
+                          {error.type}
+                        </div>
+                      )}
+                    </div>
+                  ))}
+                </div>
+              )}
+            </div>
+          )}
+
+          {/* Warnings */}
+          {warnings.length > 0 && (
+            <div>
+              <div
+                onClick={() => setShowWarnings(!showWarnings)}
+                style={{
+                  padding: '8px 16px',
+                  background: 'rgba(255, 193, 7, 0.05)',
+                  display: 'flex',
+                  alignItems: 'center',
+                  gap: 8,
+                  cursor: 'pointer',
+                  userSelect: 'none',
+                  borderBottom: '1px solid var(--border)'
+                }}
+              >
+                {showWarnings ? <ChevronDown size={16} /> : <ChevronRight size={16} />}
+                <AlertTriangle size={16} color="#f59e0b" />
+                <span style={{ fontWeight: 600, fontSize: 13, color: '#f59e0b' }}>
+                  Warnungen ({warnings.length})
+                </span>
+              </div>
+              {showWarnings && (
+                <div>
+                  {warnings.map((warning, idx) => (
+                    <div
+                      key={idx}
+                      onClick={() => handleItemClick(warning)}
+                      style={{
+                        padding: '10px 16px',
+                        borderBottom: idx < warnings.length - 1 ? '1px solid var(--border)' : 'none',
+                        cursor: warning.nodeId ? 'pointer' : 'default',
+                        background: 'transparent',
+                        transition: 'background 0.15s',
+                      }}
+                      onMouseEnter={(e) => {
+                        if (warning.nodeId) e.currentTarget.style.background = 'rgba(255, 193, 7, 0.05)'
+                      }}
+                      onMouseLeave={(e) => {
+                        e.currentTarget.style.background = 'transparent'
+                      }}
+                    >
+                      <div style={{
+                        fontSize: 13,
+                        color: 'var(--text1)',
+                        marginBottom: 4
+                      }}>
+                        {warning.message}
+                      </div>
+                      {warning.nodeId && (
+                        <div style={{
+                          fontSize: 11,
+                          color: 'var(--text3)',
+                          fontFamily: 'monospace'
+                        }}>
+                          → Klicken um zu Node zu springen
+                        </div>
+                      )}
+                      {warning.type && (
+                        <div style={{
+                          fontSize: 10,
+                          color: 'var(--text3)',
+                          marginTop: 4,
+                          textTransform: 'uppercase'
+                        }}>
+                          {warning.type}
+                        </div>
+                      )}
+                    </div>
+                  ))}
+                </div>
+              )}
+            </div>
+          )}
+        </div>
+      )}
+    </div>
+  )
+}
diff --git a/frontend/src/pages/AdminPromptsPage.jsx b/frontend/src/pages/AdminPromptsPage.jsx
index f4c5845..f364c1b 100644
--- a/frontend/src/pages/AdminPromptsPage.jsx
+++ b/frontend/src/pages/AdminPromptsPage.jsx
@@ -21,6 +21,7 @@ export default function AdminPromptsPage() {
   const [showNewPrompt, setShowNewPrompt] = useState(false)
   const [importing, setImporting] = useState(false)
   const [importResult, setImportResult] = useState(null)
+  const [importDialogData, setImportDialogData] = useState(null) // {count, fileData, event}
 
   const categories = [
     { id: 'all', label: 'Alle Kategorien' },
@@ -194,7 +195,6 @@ export default function AdminPromptsPage() {
     const file = event.target.files[0]
     if (!file) return
 
-    setImporting(true)
     setError(null)
     setImportResult(null)
 
@@ -202,14 +202,34 @@ export default function AdminPromptsPage() {
       const text = await file.text()
       const data = JSON.parse(text)
 
-      // Ask user about overwrite
-      const overwrite = confirm(
-        'Bestehende Prompts überschreiben?\n\n' +
-        'JA = Existierende Prompts aktualisieren\n' +
-        'NEIN = Nur neue Prompts erstellen, Duplikate überspringen'
-      )
+      // Show custom 3-button dialog
+      setImportDialogData({
+        count: data.count || 0,
+        fileData: data,
+        event: event
+      })
+    } catch (e) {
+      setError('Import-Fehler: ' + e.message)
+      event.target.value = '' // Reset file input
+    }
+  }
 
-      const result = await api.importPrompts(data, overwrite)
+  const handleImportChoice = async (choice) => {
+    if (!importDialogData) return
+
+    const { fileData, event } = importDialogData
+    setImportDialogData(null) // Close dialog
+
+    if (choice === 'cancel') {
+      event.target.value = '' // Reset file input
+      return
+    }
+
+    setImporting(true)
+
+    try {
+      const overwrite = choice === 'yes' // 'yes' = overwrite, 'no' = skip existing
+      const result = await api.importPrompts(fileData, overwrite)
       setImportResult(result)
       await loadPrompts()
     } catch (e) {
@@ -607,6 +627,70 @@ export default function AdminPromptsPage() {
           }}
         />
       )}
+
+      {/* Import Dialog - 3 Button Choice */}
+      {importDialogData && (
+        <div style={{
+          position: 'fixed',
+          top: 0,
+          left: 0,
+          right: 0,
+          bottom: 0,
+          background: 'rgba(0,0,0,0.5)',
+          display: 'flex',
+          alignItems: 'center',
+          justifyContent: 'center',
+          zIndex: 9999
+        }}>
+          <div style={{
+            background: 'var(--bg)',
+            borderRadius: 12,
+            padding: 24,
+            maxWidth: 500,
+            width: '90%',
+            boxShadow: '0 4px 20px rgba(0,0,0,0.2)'
+          }}>
+            <h3 style={{ marginTop: 0, marginBottom: 16, fontSize: 18 }}>
+              {importDialogData.count} Prompts importieren?
+            </h3>
+            <p style={{ marginBottom: 24, color: 'var(--text2)', lineHeight: 1.5 }}>
+              Wie sollen existierende Prompts behandelt werden?
+            </p>
+
+            <div style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
+              <button
+                className="btn btn-primary"
+                onClick={() => handleImportChoice('yes')}
+                style={{ width: '100%' }}
+              >
+                Ja, überschreiben
+                <div style={{ fontSize: 12, opacity: 0.8, marginTop: 4 }}>
+                  Bestehende Prompts aktualisieren
+                </div>
+              </button>
+
+              <button
+                className="btn"
+                onClick={() => handleImportChoice('no')}
+                style={{ width: '100%' }}
+              >
+                Nein, nur neue
+                <div style={{ fontSize: 12, opacity: 0.8, marginTop: 4 }}>
+                  Nur neue Prompts erstellen, bestehende überspringen
+                </div>
+              </button>
+
+              <button
+                className="btn btn-secondary"
+                onClick={() => handleImportChoice('cancel')}
+                style={{ width: '100%' }}
+              >
+                Abbrechen
+              </button>
+            </div>
+          </div>
+        </div>
+      )}
     </div>
   )
 }
diff --git a/frontend/src/pages/WorkflowEditorPage.jsx b/frontend/src/pages/WorkflowEditorPage.jsx
index 42a875a..35392d8 100644
--- a/frontend/src/pages/WorkflowEditorPage.jsx
+++ b/frontend/src/pages/WorkflowEditorPage.jsx
@@ -19,6 +19,7 @@ import { PlaceholderPicker } from '../components/workflow/panels/PlaceholderPick
 import { WorkflowExecutePanel } from '../components/workflow/panels/WorkflowExecutePanel'
 import { WorkflowResultViewer } from '../components/workflow/panels/WorkflowResultViewer'
 import { InlineTemplateEditor } from '../components/workflow/panels/InlineTemplateEditor'
+import { ValidationPanel } from '../components/workflow/panels/ValidationPanel'
 import { Toast } from '../components/Toast'
 import { ConfirmDialog } from '../components/ConfirmDialog'
 import '../styles/workflowEditor.css'
@@ -77,11 +78,24 @@ export default function WorkflowEditorPage() {
   const [placeholderPickerTarget, setPlaceholderPickerTarget] = useState('end') // 'end' | 'inline'
   const endNodeTextareaRef = useRef(null)
   const inlineTemplateTextareaRef = useRef(null)
+  const [hasUnsavedChanges, setHasUnsavedChanges] = useState(false)
+  const [showValidationPanel, setShowValidationPanel] = useState(true)
 
   // Toast & Confirm Dialog
   const [toast, setToast] = useState(null)
   const [confirmDialog, setConfirmDialog] = useState(null)
 
+  // Wrapped handlers to track unsaved changes
+  const handleNodesChange = useCallback((changes) => {
+    onNodesChange(changes)
+    setHasUnsavedChanges(true)
+  }, [onNodesChange])
+
+  const handleEdgesChange = useCallback((changes) => {
+    onEdgesChange(changes)
+    setHasUnsavedChanges(true)
+  }, [onEdgesChange])
+
   // Load available basis prompts for Analysis nodes
   useEffect(() => {
     async function loadPrompts() {
@@ -110,12 +124,33 @@ export default function WorkflowEditorPage() {
     const { errors, warnings } = validateWorkflowGraph(nodes, edges)
     setValidationErrors(errors)
     setValidationWarnings(warnings)
+
+    // Re-show validation panel if there are new errors/warnings
+    if (errors.length > 0 || warnings.length > 0) {
+      setShowValidationPanel(true)
+    }
   }, [nodes, edges])
 
+  // Warn on browser back/refresh if unsaved changes
+  useEffect(() => {
+    const handleBeforeUnload = (e) => {
+      if (hasUnsavedChanges) {
+        e.preventDefault()
+        e.returnValue = '' // Chrome requires returnValue to be set
+      }
+    }
+
+    window.addEventListener('beforeunload', handleBeforeUnload)
+    return () => window.removeEventListener('beforeunload', handleBeforeUnload)
+  }, [hasUnsavedChanges])
+
   // ── Handlers ──────────────────────────────────────────────────────────────
 
   const onConnect = useCallback(
-    (params) => setEdges((eds) => addEdge(params, eds)),
+    (params) => {
+      setEdges((eds) => addEdge(params, eds))
+      setHasUnsavedChanges(true)
+    },
     [setEdges]
   )
 
@@ -144,6 +179,7 @@ export default function WorkflowEditorPage() {
       }
     }
     setNodes((nds) => [...nds, base])
+    setHasUnsavedChanges(true)
   }
 
   const handleNodeUpdate = (nodeId, updates) => {
@@ -153,6 +189,7 @@ export default function WorkflowEditorPage() {
       console.log('📝 Nodes after update:', updated.find(n => n.id === nodeId))
       return updated
     })
+    setHasUnsavedChanges(true)
   }
 
   const handleDeleteNode = () => {
@@ -161,6 +198,7 @@ export default function WorkflowEditorPage() {
     setNodes((nds) => nds.filter((n) => n.id !== selectedNode.id))
     setEdges((eds) => eds.filter((e) => e.source !== selectedNode.id && e.target !== selectedNode.id))
     setSelectedNodeId(null)
+    setHasUnsavedChanges(true)
   }
 
   const handleSave = async () => {
@@ -217,6 +255,9 @@ export default function WorkflowEditorPage() {
         console.log('🚀 Navigating to:', `/workflow-editor/${result.id}`)
         navigate(`/workflow-editor/${result.id}`)
       }
+
+      // Clear unsaved changes flag after successful save
+      setHasUnsavedChanges(false)
     } catch (e) {
       console.error('❌ handleSave error:', e)
       setError(e.message)
@@ -275,6 +316,9 @@ export default function WorkflowEditorPage() {
       )
       nodeIdCounter = maxId + 1
       console.log('✅ Workflow loaded successfully, nodes:', loadedNodes.length, 'edges:', loadedEdges.length)
+
+      // Clear unsaved changes flag after successful load
+      setHasUnsavedChanges(false)
     } catch (e) {
       console.error('❌ loadWorkflow error:', e)
       setError(e.message)
@@ -296,14 +340,18 @@ export default function WorkflowEditorPage() {
   }
 
   const handleNew = () => {
-    if (confirm('Neuen Workflow erstellen? Ungespeicherte Änderungen gehen verloren.')) {
-      setNodes([])
-      setEdges([])
-      setCurrentPrompt(null)
-      setWorkflowName('Neuer Workflow')
-      setSelectedNodeId(null)
-      navigate('/workflow-editor/new')
+    if (hasUnsavedChanges) {
+      if (!confirm('Neuen Workflow erstellen? Ungespeicherte Änderungen gehen verloren.')) {
+        return
+      }
     }
+    setNodes([])
+    setEdges([])
+    setCurrentPrompt(null)
+    setWorkflowName('Neuer Workflow')
+    setSelectedNodeId(null)
+    setHasUnsavedChanges(false)
+    navigate('/workflow-editor/new')
   }
 
   const handleDelete = async () => {
@@ -328,6 +376,26 @@ export default function WorkflowEditorPage() {
     setExecutionResult(result)
   }
 
+  const handleBack = () => {
+    if (hasUnsavedChanges) {
+      const confirm = window.confirm(
+        'Du hast ungespeicherte Änderungen.\n\n' +
+        'Möchtest du wirklich zurück gehen? Alle Änderungen gehen verloren.'
+      )
+      if (!confirm) return
+    }
+    navigate('/admin/prompts')
+  }
+
+  const handleValidationNodeClick = (nodeId) => {
+    // Select the node to show its config panel
+    setSelectedNodeId(nodeId)
+
+    // TODO: Optional - scroll to node in canvas
+    // ReactFlow doesn't expose a direct scrollTo API, but we could use fitView
+    // or manual DOM manipulation if needed
+  }
+
   const handlePlaceholderSelect = (placeholderString) => {
     if (!selectedNode) return
 
@@ -392,14 +460,17 @@ export default function WorkflowEditorPage() {
     <div className="workflow-editor">
       {/* Toolbar */}
       <div className="workflow-toolbar">
-        <button className="btn-secondary" onClick={() => navigate('/admin/prompts')}>
+        <button className="btn-secondary" onClick={handleBack}>
           ← Zurück
         </button>
 
         <input
           type="text"
           value={workflowName}
-          onChange={(e) => setWorkflowName(e.target.value)}
+          onChange={(e) => {
+            setWorkflowName(e.target.value)
+            setHasUnsavedChanges(true)
+          }}
           placeholder="Interner Workflow-Name (Slug-Basis)"
           title="Technischer Name in der Datenbank. Den sichtbaren Titel für die KI-Analyse setzt du in der Start-Node."
           style={{ flex: 1, padding: '8px', borderRadius: '4px', border: '1px solid var(--border)' }}
@@ -498,8 +569,8 @@ export default function WorkflowEditorPage() {
             nodes={nodes}
             edges={edges}
             nodeTypes={nodeTypes}
-            onNodesChange={onNodesChange}
-            onEdgesChange={onEdgesChange}
+            onNodesChange={handleNodesChange}
+            onEdgesChange={handleEdgesChange}
             onConnect={onConnect}
             onNodeClick={onNodeClick}
           />
@@ -815,6 +886,16 @@ export default function WorkflowEditorPage() {
         />
       )}
 
+      {/* Validation Panel */}
+      {showValidationPanel && (validationErrors.length > 0 || validationWarnings.length > 0) && (
+        <ValidationPanel
+          errors={validationErrors}
+          warnings={validationWarnings}
+          onNodeClick={handleValidationNodeClick}
+          onClose={() => setShowValidationPanel(false)}
+        />
+      )}
+
       {/* Toast Notification */}
       {toast && (
         <Toast
diff --git a/frontend/src/utils/workflowValidation.js b/frontend/src/utils/workflowValidation.js
index 67011ad..13aa1fc 100644
--- a/frontend/src/utils/workflowValidation.js
+++ b/frontend/src/utils/workflowValidation.js
@@ -49,6 +49,14 @@ function validateStructure(nodes, edges, errors, warnings) {
       message: 'Kein END-Node vorhanden',
       severity: 'error'
     })
+  } else if (endNodes.length > 1) {
+    // Backend unterstützt aktuell nur 1 End-Node (aggregate_results nimmt letzten)
+    // Future: Multi-Exit Support würde Backend-Anpassung erfordern
+    errors.push({
+      type: 'structure',
+      message: `${endNodes.length} END-Nodes gefunden (max. 1 erlaubt)`,
+      severity: 'error'
+    })
   }
 
   // Zyklen-Erkennung