Fragebogen2025: fix wrong field type of v_4_2

should be a char field as this is the type used for other fields holding
the result of parse_geschwindigkeit16

Author: joachimschmidt557

src/feedback/migrations/0063_alter_fragebogen2025_v_4_2.py

@@ -0,0 +1,19 @@
+# Generated by Django 6.0.4 on 2026-05-01 18:02
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('feedback', '0062_alter_emailchange_dynamic_expiry_time'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='fragebogen2025',
+            name='v_4_2',
+            field=models.CharField(blank=True, default='', max_length=1),
+            preserve_default=False,
+        ),
+    ]

src/feedback/models/fragebogen2025.py

@@ -34,7 +34,7 @@ class Fragebogen2025(Fragebogen):
     v_3_7 = models.PositiveSmallIntegerField(blank=True, null=True)
 
     v_4_1 = models.PositiveSmallIntegerField(blank=True, null=True)
-    v_4_2 = models.PositiveSmallIntegerField(blank=True, null=True)
+    v_4_2 = models.CharField(max_length=1, blank=True)
     v_4_3 = models.PositiveSmallIntegerField(blank=True, null=True)
     v_4_4 = models.PositiveSmallIntegerField(blank=True, null=True)
     v_4_5 = models.CharField(max_length=1, choices=Fragebogen.STUNDEN_NACHBEARBEITUNG, blank=True)
@@ -122,7 +122,7 @@ class Ergebnis2025(Ergebnis):
             ]
         ],
     ]
-    
+
     parts_ue = [
         ['ue_didaktik', 'Übung: Didaktik',
          ['4.1 Die Übung war inhaltlich gut strukturiert.',