slight fix of an import dubbeling

README.md

@@ -1,6 +1,6 @@
 # Inventarsystem
 
-[![https://github.com/AIIrondev/legendary-octo-garbanzo](https://github.com/AIIrondev/legendary-octo-garbanzo/actions/workflows/release-docker.yml/badge.svg)](https://github.com/AIIrondev/legendary-octo-garbanzo/actions/workflows/release-docker.yml)
+[![https://git.invario-software.eu/Invario/Inventarsystem](https://git.invario-software.eu/Invario/Inventarsystem/actions/workflows/release-docker.yml/badge.svg)](https://git.invario-software.eu/Invario/Inventarsystem/actions/workflows/release-docker.yml)
 
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Web/app.py

@@ -2150,9 +2150,8 @@ def generate_ausweis_id_excel(existing_ids_set):
         else:
             print(f"Already found: {new_id}, trying another...")
 
-
 def _upload_student_cards_excel():
-    """Bulk import student cards from Excel with automatic name/class mapping."""
+    """Bulk import student cards from Excel with automatic name/class mapping, rollover support, and encryption."""
     if 'username' not in session:
         flash('Nicht angemeldet.', 'error')
         return redirect(url_for('login'))
@@ -2177,6 +2176,8 @@ def _upload_student_cards_excel():
         flash('Nur .xlsx oder .csv Dateien werden unterstützt.', 'error')
         return redirect(url_for('student_cards_admin'))
 
+    rollover_mode = request.form.get('rollover_mode') in ['true', '1', 'on']
+
     try:
         header_row, data_rows = _load_tabular_upload(excel_file)
     except Exception as exc:
@@ -2191,12 +2192,14 @@ def _upload_student_cards_excel():
 
     synonyms = {
         'ausweis_id': ['ausweis_id', 'ausweisid', 'ausweis-id', 'karte', 'kartennummer', 'card_id', 'id'],
-        'ausweis_ident': ['lokales Differenzierungsmerkmal', 'lokales differenzierungsmerkmal', 'lokales_differenzierungsmerkmal', 'ausweis_ident', 'differenzierungsmerkmal'],
-        'first_name': ['vorname', 'first_name', 'firstname', 'rufname', 'Vorname'],
-        'last_name': ['nachname', 'last_name', 'lastname', 'Nachname'],
-        'class_name': ['klasse', 'class', 'class_name', 'jahrgang', 'jahrgangsstufe', 'stufe', 'gruppe', 'asv_klasse', 'Jahrgang', 'Klasse'],
-        'notes': ['notizen', 'notes', 'bemerkungen', 'bemerkung', 'hinweis', 'hinweise', 'Notizen', 'Bemerkung', 'Hinweis', 'Hinweise'],
-        'default_borrow_days': ['standard_ausleihdauer', 'ausleihdauer', 'borrow_days', 'tage', 'leihtage', 'max_borrow_days', 'Ausleihdauer'],
+        'ausweis_ident': ['lokales differenzierungsmerkmal', 'lokales_differenzierungsmerkmal', 'ausweis_ident',
+                          'differenzierungsmerkmal'],
+        'first_name': ['vorname', 'first_name', 'firstname', 'rufname'],
+        'last_name': ['nachname', 'last_name', 'lastname'],
+        'class_name': ['klasse', 'class', 'class_name', 'jahrgang', 'jahrgangsstufe', 'stufe', 'gruppe', 'asv_klasse'],
+        'notes': ['notizen', 'notes', 'bemerkungen', 'bemerkung', 'hinweis', 'hinweise'],
+        'default_borrow_days': ['standard_ausleihdauer', 'ausleihdauer', 'borrow_days', 'tage', 'leihtage',
+                                'max_borrow_days'],
     }
 
     def col_index(key):
@@ -2227,8 +2230,9 @@ def _upload_student_cards_excel():
     client = MongoClient(cfg.MONGODB_HOST, cfg.MONGODB_PORT)
     try:
         db = client[cfg.MONGODB_DB]
-        
-        student_cards_cursor = db['student_cards'].find({}, {'AusweisId': 1})
+        student_cards_col = db['student_cards']
+
+        student_cards_cursor = student_cards_col.find({}, {'AusweisId': 1})
         existing_ids.update(
             str(card.get('AusweisId', '')).strip().upper()
             for card in student_cards_cursor
@@ -2250,34 +2254,27 @@ def _upload_student_cards_excel():
 
             ausweis_id = sanitize_form_value(val('ausweis_id'))
             ausweis_ident = sanitize_form_value(val('ausweis_ident'))
-            class_name = sanitize_form_value(val('class_name'))
+            class_name = sanitize_form_value(val('class_name')) or ""
             notes = sanitize_form_value(val('notes'))
-            
-            # Ausleihdauer extrahieren und standardmäßig auf 14 setzen
-            default_borrow_days = _excel_int(val('default_borrow_days'))
-            if not default_borrow_days:
-                default_borrow_days = 14
 
-            # Vor- und Nachname sicher auslesen und zusammensetzen
+            default_borrow_days = _excel_int(val('default_borrow_days')) or 14
+
             first_name = sanitize_form_value(val('first_name')) or ""
             last_name = sanitize_form_value(val('last_name')) or ""
             student_name = f"{first_name} {last_name}".strip()
 
-            # Leere Zeilen überspringen
             if not ausweis_id and not student_name and not class_name:
                 continue
 
             row_errors = []
-            
             if not student_name:
                 row_errors.append('Vorname und Nachname fehlen')
 
-            # Logik für die Haupt-AusweisID
             if not ausweis_id and student_name:
                 ausweis_id = generate_ausweis_id(existing_ids)
                 validation_warnings.append((row_number, f'Ausweis-ID wurde automatisch erzeugt: {ausweis_id}'))
-                existing_ids.add(ausweis_id.upper()) 
-            elif ausweis_id:
+                existing_ids.add(ausweis_id.upper())
+            elif ausweis_id and not rollover_mode:
                 ausweis_id = str(ausweis_id).strip().upper()
                 if ausweis_id in existing_ids:
                     row_errors.append(f'Ausweis-ID {ausweis_id} existiert bereits')
@@ -2300,29 +2297,92 @@ def _upload_student_cards_excel():
                 'notes': notes,
                 'default_borrow_days': default_borrow_days,
             })
-    finally:
-        client.close()
 
-    if validation_errors:
-        details = '; '.join([f'Zeile {n}: {msg}' for n, msg in validation_errors[:15]])
-        flash(f'Validierung fehlgeschlagen ({len(validation_errors)} Zeilen). {details}', 'error')
-        return redirect(url_for('student_cards_admin'))
+        if validation_errors:
+            details = '; '.join([f'Zeile {n}: {msg}' for n, msg in validation_errors[:15]])
+            flash(f'Validierung fehlgeschlagen ({len(validation_errors)} Zeilen). {details}', 'error')
+            return redirect(url_for('student_cards_admin'))
 
-    if validation_only:
-        warning_text = ''
-        if validation_warnings:
-            warning_details = '; '.join([f'Zeile {n}: {msg}' for n, msg in validation_warnings[:10]])
-            warning_text = f' Hinweise: {warning_details}'
-        flash(f'Validierung erfolgreich: {len(planned_rows)} Ausweise würden importiert.{warning_text}', 'success')
-        return redirect(url_for('student_cards_admin'))
+        matched_db_doc_ids = set()
+        rows_to_create = []
+        matched_count = 0
 
-    client = MongoClient(cfg.MONGODB_HOST, cfg.MONGODB_PORT)
-    try:
-        db = client[cfg.MONGODB_DB]
-        student_cards = db['student_cards']
+        if rollover_mode:
+            raw_db_cards = list(student_cards_col.find())
+            decrypted_db_cards = []
+
+            for doc in raw_db_cards:
+                dec_name = decrypt_text(doc.get('SchülerName')) if doc.get('SchülerName') else ""
+                dec_class = decrypt_text(doc.get('Klasse')) if doc.get('Klasse') else ""
+
+                raw_ident = doc.get('ausweis_ident') or doc.get('AusweisIdent') or ""
+                dec_ident = raw_ident
+                if raw_ident and str(raw_ident).startswith("gAAAAA"):
+                    try:
+                        dec_ident = decrypt_text(raw_ident)
+                    except Exception:
+                        pass
+
+                decrypted_db_cards.append({
+                    '_id': doc['_id'],
+                    'AusweisId': str(doc.get('AusweisId', '')).strip().upper(),
+                    'AusweisIdent': str(dec_ident or '').strip().upper(),
+                    'SchülerName': str(dec_name or '').strip().lower(),
+                    'Klasse': str(dec_class or '').strip().lower(),
+                })
+
+            for excel_row in planned_rows:
+                ex_ident = str(excel_row['ausweis_ident'] or '').strip().upper()
+                ex_name = str(excel_row['student_name'] or '').strip().lower()
+                ex_class = str(excel_row['class_name'] or '').strip().lower()
+
+                match_found = None
+                for db_card in decrypted_db_cards:
+                    if db_card['_id'] in matched_db_doc_ids:
+                        continue
+
+                    ident_matches = ex_ident and (ex_ident == db_card['AusweisIdent'])
+                    secondary_matches = (ex_name and ex_name == db_card['SchülerName']) and \
+                                        (ex_class and ex_class == db_card['Klasse'])
+
+                    if ident_matches or secondary_matches:
+                        match_found = db_card
+                        break
+
+                if match_found:
+                    matched_db_doc_ids.add(match_found['_id'])
+                    matched_count += 1
+                else:
+                    rows_to_create.append(excel_row)
+
+            db_ids_to_delete = [
+                doc['_id'] for doc in raw_db_cards
+                if doc['_id'] not in matched_db_doc_ids
+            ]
+        else:
+            rows_to_create = planned_rows
+            db_ids_to_delete = []
+
+        if validation_only:
+            warning_text = f" Hinweise: {'; '.join([f'Zeile {n}: {msg}' for n, msg in validation_warnings[:10]])}" if validation_warnings else ""
+            if rollover_mode:
+                flash(
+                    f'Validierung erfolgreich ({len(planned_rows)} Excel-Zeilen). '
+                    f'Abgleich-Vorschau: {matched_count} unverändert, {len(rows_to_create)} neu, {len(db_ids_to_delete)} zum Löschen.{warning_text}',
+                    'success'
+                )
+            else:
+                flash(f'Validierung erfolgreich: {len(planned_rows)} Ausweise würden importiert.{warning_text}',
+                      'success')
+            return redirect(url_for('student_cards_admin'))
+
+        deleted_count = 0
+        if db_ids_to_delete:
+            res = student_cards_col.delete_many({'_id': {'$in': db_ids_to_delete}})
+            deleted_count = res.deleted_count
 
         created_total = 0
-        for row in planned_rows:
+        for row in rows_to_create:
             encrypted_payload = encrypt_document_fields(
                 {
                     'ausweis_ident': row['ausweis_ident'],
@@ -2332,29 +2392,33 @@ def _upload_student_cards_excel():
                 },
                 STUDENT_CARD_ENCRYPTED_FIELDS
             )
-            student_cards.insert_one({
+            student_cards_col.insert_one({
                 'AusweisId': row['ausweis_id'],
                 'StandardAusleihdauer': int(row['default_borrow_days']),
                 'Erstellt': datetime.datetime.now(),
                 **encrypted_payload,
             })
             created_total += 1
+
     except Exception as exc:
         app.logger.error(f'Error importing student cards from Excel: {exc}')
-        flash(f'Fehler beim Import der Bibliotheksausweise', 'error')
+        flash('Fehler beim Import der Bibliotheksausweise.', 'error')
         return redirect(url_for('student_cards_admin'))
     finally:
         client.close()
 
-    if validation_warnings:
-        warning_details = '; '.join([f'Zeile {n}: {msg}' for n, msg in validation_warnings[:10]])
-        flash(f'Excel-Import erfolgreich: {created_total} Ausweise importiert. Hinweise: {warning_details}', 'warning')
+    warning_details = f" Hinweise: {'; '.join([f'Zeile {n}: {msg}' for n, msg in validation_warnings[:10]])}" if validation_warnings else ""
+    if rollover_mode:
+        flash(
+            f'Schuljahres-Abgleich erfolgreich: {matched_count} Schüler beibehalten, '
+            f'{created_total} neu hinzugefügt, {deleted_count} alte Einträge gelöscht.{warning_details}',
+            'success'
+        )
     else:
-        flash(f'Excel-Import erfolgreich: {created_total} Ausweise importiert.', 'success')
+        flash(f'Excel-Import erfolgreich: {created_total} Ausweise importiert.{warning_details}', 'success')
 
     return redirect(url_for('student_cards_admin'))
 
-
 def _upload_excel_items(scope='inventory'):
     """Bulk import inventory/library items from Excel with validation-first workflow."""
     if 'username' not in session:
@@ -3262,9 +3326,6 @@ def library_loans_admin():
 
     _ensure_audit_indexes_once()
 
-    # IMPORT HINZUGEFÜGT: Entschlüsselungs-Tool importieren
-    from modules.inventarsystem.data_protection import decrypt_text
-
     def fmt_dt(dt):
         try:
             return dt.strftime('%d.%m.%Y %H:%M') if dt else ''

Web/templates/student_cards_admin.html

@@ -45,6 +45,33 @@
         justify-content: space-between;
     }
 
+    .rollover-box {
+        background: #fff3cd;
+        border: 1px solid #ffeeba;
+        border-radius: 6px;
+        padding: 10px 12px;
+        margin-top: 4px;
+    }
+
+    .rollover-label {
+        display: flex;
+        align-items: center;
+        gap: 8px;
+        cursor: pointer;
+        font-size: 13px;
+        color: #856404;
+        font-weight: 700;
+        margin: 0;
+    }
+
+    .rollover-hint {
+        display: block;
+        margin-top: 4px;
+        font-size: 11px;
+        color: #856404;
+        line-height: 1.3;
+    }
+
     .form-row {
         display: grid;
         grid-template-columns: 1fr 1fr;
@@ -359,16 +386,29 @@
             </form>
         </div>
 
-        <!-- Excel-Import -->
+        <!-- Excel-Import mit Abgleich (Rollover-Modus) -->
         <div class="import-card">
             <div>
                 <h3 style="margin:0 0 8px 0;">Excel-Import</h3>
-                <p style="margin:0 0 15px 0; color:#555; font-size:13px; line-height:1.4;">
+                <p style="margin:0 0 12px 0; color:#555; font-size:13px; line-height:1.4;">
                     Laden Sie eine <strong>.xlsx</strong>- oder <strong>.csv</strong>-Datei hoch (z. B. aus <strong>ASV</strong>). Erkannt werden Name, Nachname, Klasse, Ausweis-ID, lokales Differenzierungsmerkmal, Notizen & Ausleihdauer.
                 </p>
             </div>
+
             <form method="POST" action="{{ url_for('upload_student_cards_excel') }}" enctype="multipart/form-data" style="display:flex; flex-direction:column; gap:12px;">
                 <input type="file" name="student_cards_excel" accept=".xlsx,.csv" required style="font-size:13px;">
+
+                <!-- Rollover / Abgleich Option -->
+                <div class="rollover-box">
+                    <label class="rollover-label">
+                        <input type="checkbox" name="rollover_mode" value="true">
+                        <span>Rollover-Modus (Abgleich / Destruktiv)</span>
+                    </label>
+                    <span class="rollover-hint">
+                        ⚠️ <strong>Warnung:</strong> Nicht mehr vorhandene Ausweise/Schüler werden beim Import entfernt bzw. abgeglichen.
+                    </span>
+                </div>
+
                 <div style="display:flex; gap:8px;">
                     <button type="submit" class="btn btn-secondary" name="excel_action" value="validate" style="flex:1;">Validieren</button>
                     <button type="submit" class="btn btn-primary" name="excel_action" value="import" style="flex:1;">Importieren</button>