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({
@@ -1193,31 +1196,34 @@ def update_appointment_statuses():
                     updated_count += 1
                     if new_status == 'active':
                         activated_count += 1
-                        try:
-                            _create_notification(
-                                db,
-                                audience='user',
-                                notif_type='appointment_activated',
-                                title='Reservierung ist jetzt aktiv',
-                                message=(
-                                    f"Deine geplante Ausleihe für {item_name} startet jetzt."
-                                ),
-                                target_user=str(appointment.get('User') or '').strip() or None,
-                                reference={
-                                    'appointment_id': str(appointment.get('_id')),
-                                    'item_id': str(appointment.get('Item') or ''),
-                                    'event': 'activated',
-                                },
-                                unique_key=f"appointment:activated:{appointment.get('_id')}",
-                                severity='info',
-                            )
-                        except Exception as notif_err:
-                            app.logger.warning(
-                                f"Failed to create activation notification for {appointment.get('_id')}: {notif_err}"
-                            )
                     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,
+                            audience='user',
+                            notif_type='appointment_activated',
+                            title='Reservierung ist jetzt aktiv',
+                            message=(
+                                f"Deine geplante Ausleihe für {activation_item_name} startet jetzt."
+                            ),
+                            target_user=activation_user,
+                            reference={
+                                'appointment_id': str(appointment.get('_id')),
+                                'item_id': str(appointment.get('Item') or ''),
+                                'event': 'activated',
+                            },
+                            unique_key=f"appointment:activated:{appointment.get('_id')}",
+                            severity='info',
+                        )
+                    except Exception as notif_err:
+                        app.logger.warning(
+                            f"Failed to create activation notification for {appointment.get('_id')}: {notif_err}"
+                        )
+
         client.close()
 
         if updated_count > 0: