feat: Create activation notifications for appointments when status changes to active

Web/app.py

@@ -1123,6 +1123,8 @@ def update_appointment_statuses():
 
         for appointment in appointments_to_check:
             old_status = appointment.get('Status')
+            activation_user = str(appointment.get('User') or '').strip()
+            activation_item_name = str(appointment.get('Item') or 'Termin')
 
             # Aktuellen Status bestimmen
             new_status = au.get_current_status(appointment, log_changes=True, user='scheduler')
@@ -1147,6 +1149,7 @@ def update_appointment_statuses():
                             )
                             if item_doc:
                                 item_name = item_doc.get('Name', item_id_str)
+                                activation_item_name = item_name
                                 total_exemplare = int(item_doc.get('Exemplare', 1))
                                 # Count how many active (non-planned) borrows currently hold this item
                                 active_borrows = ausleihungen.count_documents({
@@ -1193,6 +1196,11 @@ def update_appointment_statuses():
                     updated_count += 1
                     if new_status == 'active':
                         activated_count += 1
+                    elif new_status == 'completed':
+                        completed_count += 1
+
+                # Create activation notification even if another worker already updated the status.
+                if old_status == 'planned' and new_status == 'active' and activation_user:
                     try:
                         _create_notification(
                             db,
@@ -1200,9 +1208,9 @@ def update_appointment_statuses():
                             notif_type='appointment_activated',
                             title='Reservierung ist jetzt aktiv',
                             message=(
-                                    f"Deine geplante Ausleihe für {item_name} startet jetzt."
+                                f"Deine geplante Ausleihe für {activation_item_name} startet jetzt."
                             ),
-                                target_user=str(appointment.get('User') or '').strip() or None,
+                            target_user=activation_user,
                             reference={
                                 'appointment_id': str(appointment.get('_id')),
                                 'item_id': str(appointment.get('Item') or ''),
@@ -1215,8 +1223,6 @@ def update_appointment_statuses():
                         app.logger.warning(
                             f"Failed to create activation notification for {appointment.get('_id')}: {notif_err}"
                         )
-                    elif new_status == 'completed':
-                        completed_count += 1
 
         client.close()