diff --git a/app/app.py b/app/app.py
index 3689ca0..75556f5 100644
--- a/app/app.py
+++ b/app/app.py
@@ -6,15 +6,12 @@ from flask_session import Session
 
 app = Flask(__name__)
 app.secret_key = "gfbierpf934hftrntr45otgß45890tfh34gft45rw"  # replace with a secure random key
-app.secret_key = "gfbierpf934hftrntr45otgß45890tfh34gft45rw"  # replace with a secure random key
 app.config['SESSION_TYPE'] = 'filesystem'
 app.config['SESSION_FILE_DIR'] = './.flask_session/'
 Session(app)
 
-STRIPE_COLS = ['Type', 'ID', 'Created', 'Description', 'Amount', 'Currency', 'Converted Amount', 'Fees', 'Net', 'Converted Currency', 'Details']
-RAISENOW_COLS = ['Identifikationsnummer', 'Erstellt', 'UTC-Offset', 'Status', 'Betrag', 'Währung', 'Übernommene Gebühren - Betrag', 'Übernommene Gebühren - Währung', 'Zahlungsmethode', 'Zahlungsanbieter', 'Nettobetrag', 'Auszahlungswährung']
-STRIPE_COLS = ['Type', 'ID', 'Created', 'Description', 'Amount', 'Currency', 'Converted Amount', 'Fees', 'Net', 'Converted Currency', 'Details']
-RAISENOW_COLS = ['Identifikationsnummer', 'Erstellt', 'UTC-Offset', 'Status', 'Betrag', 'Währung', 'Übernommene Gebühren - Betrag', 'Übernommene Gebühren - Währung', 'Zahlungsmethode', 'Zahlungsanbieter', 'Nettobetrag', 'Auszahlungswährung']
+STRIPE_STARTING_COLS = ['Type', 'ID', 'Created', 'Description', 'Amount', 'Currency', 'Converted Amount', 'Fees', 'Net', 'Converted Currency', 'Details']
+RAISENOW_STARTING_COLS = ['Identifikationsnummer', 'Erstellt', 'UTC-Offset', 'Status', 'Betrag', 'Währung', 'Übernommene Gebühren - Betrag', 'Übernommene Gebühren - Währung', 'Zahlungsmethode', 'Zahlungsanbieter', 'Nettobetrag', 'Auszahlungswährung']
 
 
 def get_dataframe(key):
@@ -59,7 +56,7 @@ def get_merged_df(table_name):
     )
     
     # --- load & normalize Raisenow ---
-    raisenow = get_dataframe('raiseNow_import')
+    raisenow = get_dataframe('raisenow_import')
     if not raisenow.empty:
         raisenow = (
             raisenow
@@ -92,45 +89,13 @@ def get_merged_df(table_name):
     # --- return raw tables if requested ---
     if table_name == 'stripe_import':
         return stripe.dropna(axis=1, how='all')
-    if table_name == 'raiseNow_import':
-        return raisenow.dropna(axis=1, how='all')
-    # additional assignment: build a mask of rows where norm_zweck is still empty/NaN
-    mask = raisenow['norm_zweck'].isna() | (raisenow['norm_zweck'] == '')
-    raisenow.loc[mask, 'norm_zweck'] = (
-        raisenow.loc[mask, 'raisenow_parameters.product.source_url']
-            .str.extract(r'https?://[^/]+/([^/?#]+)')[0]
-    )
-
-    # --- return raw tables if requested ---
-    if table_name == 'stripe_import':
-        return stripe.dropna(axis=1, how='all')
-    if table_name == 'raiseNow_import':
+    if table_name == 'raisenow_import':
         return raisenow.dropna(axis=1, how='all')
 
     # --- 1) Greedy exact same-day matches ---
     pairs = []
     # index Raisenow rows for fast lookup + dropping
     rr = raisenow.set_index('idx_raisenow')
-    for _, s in stripe.iterrows():
-        # filter candidates by amount & name
-        cand = rr[
-            (rr['norm_amount'] == s['norm_amount']) &
-            (rr['norm_name']   == s['norm_name'])
-        ].copy()
-        if cand.empty:
-            continue
-        # compute absolute date difference (days only)
-        date_diff = (cand['norm_date'].dt.normalize() - s['norm_date'].normalize()).abs()
-        exact_cand = cand[date_diff == pd.Timedelta(0)]
-        if not exact_cand.empty:
-            # pick the first exact match
-            best = exact_cand.index[0]
-            pairs.append((int(s['idx_stripe']), int(best)))
-            rr = rr.drop(best)
-    # --- 1) Greedy exact same-day matches ---
-    pairs = []
-    # index Raisenow rows for fast lookup + dropping
-    rr = raisenow.set_index('idx_raisenow')
     for _, s in stripe.iterrows():
         # filter candidates by amount & name
         cand = rr[
@@ -181,40 +146,6 @@ def get_merged_df(table_name):
 
     combined = pd.DataFrame(merged_rows)
 
-    # --- slice out the requested view ---
-    # --- 2) Greedy fuzzy ±1-day matches on remaining rows ---
-    used_stripe = {s for s, _ in pairs}
-    stripe_left = stripe[~stripe['idx_stripe'].isin(used_stripe)].copy()
-    for _, s in stripe_left.iterrows():
-        cand = rr[
-            (rr['norm_amount'] == s['norm_amount']) &
-            (rr['norm_name']   == s['norm_name'])
-        ].copy()
-        if cand.empty:
-            continue
-        date_diff = (cand['norm_date'].dt.normalize() - s['norm_date'].normalize()).abs()
-        cand = cand[date_diff <= pd.Timedelta(days=1)]
-        if cand.empty:
-            continue
-        # pick the one with the smallest gap
-        best = date_diff.idxmin()
-        pairs.append((int(s['idx_stripe']), int(best)))
-        rr = rr.drop(best)
-
-    # --- build the merged DataFrame without suffixes ---
-    merged_rows = []
-    for s_idx, r_idx in pairs:
-        srow = stripe.loc[s_idx].to_dict()
-        rrow = raisenow.loc[r_idx].to_dict()
-        # drop any overlapping keys so we never get suffixes
-        for k in ['norm_amount','norm_name','norm_date','norm_email','idx_stripe']:
-            rrow.pop(k, None)
-        # now combine so stripe values win for those keys, and raisenow adds its own columns
-        merged = {**srow, **rrow}
-        merged_rows.append(merged)
-
-    combined = pd.DataFrame(merged_rows)
-
     # --- slice out the requested view ---
     if table_name == 'merged':
         result = combined
@@ -230,7 +161,6 @@ def get_merged_df(table_name):
     return result.dropna(axis=1, how='all')
 
 
-
 @app.route('/')
 def index():
     return render_template('index.html')
@@ -249,11 +179,11 @@ def upload():
         raw = raw.dropna(how='all').dropna(axis=1, how='all')
         raw = raw.astype(object).replace({np.nan: None})
         cols = list(raw.columns)
-        if cols[:len(STRIPE_COLS)] == STRIPE_COLS:
+        if cols[:len(STRIPE_STARTING_COLS)] == STRIPE_STARTING_COLS:
             key = 'stripe_import'
             dedupe_col = 'ID'
-        elif cols[:len(RAISENOW_COLS)] == RAISENOW_COLS:
-            key = 'raiseNow_import'
+        elif cols[:len(RAISENOW_STARTING_COLS)] == RAISENOW_STARTING_COLS:
+            key = 'raisenow_import'
             dedupe_col = 'Identifikationsnummer'
         else:
             continue
@@ -287,17 +217,7 @@ def download():
         name: get_merged_df(name)
         for name in [
             'stripe_import',
-            'raiseNow_import',
-            'merged',
-            'stripe_only',
-            'raisenow_only'
-        ]
-    }
-    sheets = {
-        name: get_merged_df(name)
-        for name in [
-            'stripe_import',
-            'raiseNow_import',
+            'raisenow_import',
             'merged',
             'stripe_only',
             'raisenow_only'
@@ -331,5 +251,13 @@ def download():
         mimetype='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
     )
 
+@app.route('/clear_session', methods=['POST'])
+def clear_session():
+    """
+    Clear all session data and reset server-side stored DataFrames.
+    """
+    session.clear()
+    return jsonify({'status': 'session cleared'})
+
 if __name__ == '__main__':
     app.run(debug=True)
diff --git a/app/templates/index.html b/app/templates/index.html
index 91dcb8a..999ba42 100644
--- a/app/templates/index.html
+++ b/app/templates/index.html
@@ -8,7 +8,7 @@
   <link href="https://unpkg.com/tabulator-tables@5.4.4/dist/css/tabulator.min.css" rel="stylesheet">
   <style>
     body { padding: 2rem; background: #f8f9fa; }
-    #table-container { height: 800px; width: 100%; }
+    #table-container { height: 800px; width: 100%; overflow-x: auto;}
     #table { width: 100%; }
 
     /* Loading Overlay */
@@ -39,9 +39,10 @@
         <input type="file" name="files" multiple class="form-control form-control-sm me-2">
         <button type="submit" class="btn btn-primary btn-sm">Upload</button>
       </form>
-      <button id="download-excel" class="btn btn-success btn-sm me-3">Download All</button>
+      <button id="download-excel" class="btn btn-success btn-sm me-3">Excel Download</button>
+      <button id="clear-session" class="btn btn-warning btn-sm me-3">Daten löschen</button>
       <div class="d-flex align-items-center">
-        <label for="table-select" class="form-label me-2 mb-0">Tabelle:</label>
+        <label for="table-select" class="form-label me-2 mb-0">Table:</label>
         <select id="table-select" class="form-select form-select-sm">
           <option value="stripe_import">Stripe Import</option>
           <option value="raiseNow_import">RaiseNow Import</option>
@@ -72,6 +73,7 @@
     const uploadForm = document.getElementById('upload-form');
     const tableSelect = document.getElementById('table-select');
     const downloadBtn = document.getElementById('download-excel');
+    const clearBtn = document.getElementById('clear-session');
     const loadingOverlay = document.getElementById('loadingOverlay');
     let table;
 
@@ -105,12 +107,34 @@
         const disposition = resp.headers.get('Content-Disposition') || '';
         const match = disposition.match(/filename="?([^";]+)"?/);
         a.download = match ? match[1] : 'tables.xlsx';
-        document.body.appendChild(a); a.click(); a.remove(); URL.revokeObjectURL(url);
+        document.body.appendChild(a);
+        a.click();
+        a.remove();
+        URL.revokeObjectURL(url);
       } catch (err) {
         console.error(err); alert(err.message);
       } finally { hideLoading(); }
     });
 
+    clearBtn.addEventListener('click', async () => {
+      if (!confirm('Are you sure you want to clear the server session? This will reset all loaded data.')) return;
+      showLoading();
+      try {
+        const resp = await fetch('/clear_session', { method: 'POST' });
+        const res = await resp.json();
+        if (!resp.ok) throw new Error(res.error || 'Failed to clear session');
+        // Reset UI
+        tableSelect.value = 'stripe_import';
+        if (table) table.destroy();
+        table = null;
+        alert('Session cleared successfully.');
+      } catch (err) {
+        console.error(err); alert(err.message);
+      } finally {
+        hideLoading();
+      }
+    });
+
     async function loadTable(name) {
       showLoading();
       try {
@@ -118,10 +142,17 @@
         const json = await resp.json();
         if (!resp.ok) { alert(json.error || 'Error loading'); return; }
         if (!Array.isArray(json.data) || !json.data.length) { alert('No data for this table'); return; }
+
         const cols = json.columns.map(c => ({ title: c, field: c, headerFilter: true }));
-        const opts = { data: json.data, layout: 'fitData', height: '100%', columns: cols, responsiveLayout: 'hide' };
-        if (table) { table.setColumns(cols); await table.replaceData(json.data); }
-        else { table = new Tabulator('#table', opts); }
+        const opts = {
+          data: json.data,
+          layout: 'fitData',
+          height: '100%',
+          columns: cols,
+        };
+
+        if (table) table.destroy();
+        table = new Tabulator('#table', opts);
       } catch (err) {
         console.error(err); alert('Failed to load table data');
       } finally { hideLoading(); }
@@ -131,4 +162,4 @@
     loadTable(tableSelect.value);
   </script>
 </body>
-</html>
\ No newline at end of file
+</html>