diff --git a/src/pages/admin/AdminDatabaseHealthPage.tsx b/src/pages/admin/AdminDatabaseHealthPage.tsx
index 2df9fb1..6ab7b8b 100644
--- a/src/pages/admin/AdminDatabaseHealthPage.tsx
+++ b/src/pages/admin/AdminDatabaseHealthPage.tsx
@@ -961,38 +961,99 @@ const MigrationTab: React.FC = () => {
     const fileMb = (file.size / (1024 * 1024)).toFixed(1);
 
     try {
+      // Phase 1: Upload file to disk
       const formData = new FormData();
       formData.append('file', file);
-      const res = await api.post('/api/admin/database-health/migration/upload-import', formData, {
+      const uploadRes = await api.post('/api/admin/database-health/migration/upload-import', formData, {
         headers: { 'Content-Type': 'multipart/form-data' },
         timeout: 0,
         onUploadProgress: (e) => {
           if (e.total) {
             const pct = Math.round((e.loaded / e.total) * 100);
             const loadedMb = (e.loaded / (1024 * 1024)).toFixed(1);
-            setUploadProgress(pct < 100
-              ? t('Upload: {loaded} / {total} MB ({pct}%)', { loaded: loadedMb, total: fileMb, pct })
-              : t('Validierung laeuft ({total} MB)...', { total: fileMb }),
+            setUploadProgress(
+              pct < 100
+                ? t('Upload: {loaded} / {total} MB ({pct}%)', { loaded: loadedMb, total: fileMb, pct })
+                : t('Verarbeitung wird gestartet...'),
             );
           }
         },
       });
+
+      const token = uploadRes.data.token;
+      if (!token) throw new Error('No token returned from upload');
+
+      // Phase 2: Stream validation + split with progress
+      const baseURL = api.defaults.baseURL || '';
+      const streamUrl = `${baseURL}/api/admin/database-health/migration/process-import-stream?token=${encodeURIComponent(token)}`;
+      const streamRes = await fetch(streamUrl, { credentials: 'include' });
+
+      if (!streamRes.ok) {
+        const errText = await streamRes.text();
+        throw new Error(`Server ${streamRes.status}: ${errText}`);
+      }
+      if (!streamRes.body) throw new Error('ReadableStream not supported');
+
+      const reader = streamRes.body.getReader();
+      const decoder = new TextDecoder();
+      let buf = '';
+      let finalResult: any = null;
+
+      for (;;) {
+        const { done, value } = await reader.read();
+        if (done) break;
+        buf += decoder.decode(value, { stream: true });
+
+        const lines = buf.split('\n');
+        buf = lines.pop() || '';
+
+        for (const line of lines) {
+          if (!line.trim()) continue;
+          try {
+            const evt = JSON.parse(line);
+            if (evt.phase === 'validate') {
+              setUploadProgress(
+                t('Pass 1 Validierung: {db}.{table} ({rows} Datensaetze)', {
+                  db: evt.db, table: evt.table, rows: evt.rows,
+                }),
+              );
+            } else if (evt.phase === 'split') {
+              setUploadProgress(
+                t('Pass 2 Split: {db}.{table} ({rows} Datensaetze)', {
+                  db: evt.db, table: evt.table, rows: evt.rows,
+                }),
+              );
+            } else if (evt.phase === 'done') {
+              finalResult = evt.result;
+            } else if (evt.phase === 'error') {
+              throw new Error(evt.detail || 'Processing failed');
+            }
+          } catch (parseErr) {
+            if ((parseErr as Error).message?.startsWith('Processing'))
+              throw parseErr;
+          }
+        }
+      }
+
       setUploadProgress('');
-      importTokenRef.current = res.data.token || '';
+
+      if (!finalResult) throw new Error('No result received from processing stream');
+
+      importTokenRef.current = finalResult.token || token;
       setValidation({
-        valid: res.data.valid,
-        summary: (res.data.databases || []).map((d: any) => ({
+        valid: finalResult.valid,
+        summary: (finalResult.databases || []).map((d: any) => ({
           database: d.database,
           tableCount: d.tableCount,
           recordCount: d.recordCount,
           registered: true,
         })),
-        warnings: res.data.warnings || [],
-        systemObjectsFound: res.data.systemObjectsFound || [],
+        warnings: finalResult.warnings || [],
+        systemObjectsFound: finalResult.systemObjectsFound || [],
       });
     } catch (err: any) {
       setUploadProgress('');
-      const detail = err?.response?.data?.detail;
+      const detail = err?.response?.data?.detail || err?.message;
       setValidation({
         valid: false, summary: [], systemObjectsFound: [],
         warnings: [typeof detail === 'string' ? detail : t('Upload oder Validierung fehlgeschlagen')],