Initial

app/base/models/course_visit.py

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+from django.db import models
+from django.urls import reverse
+
+from app.base.forms.fields import DateField
+
+from datetime import date
+from typing import TYPE_CHECKING
+if TYPE_CHECKING:
+    from app.base.models.course import Course
+    from app.base.models.person import Person
+
+
+class CourseVisit(models.Model):
+    course: 'models.ForeignKey[Course]' = models.ForeignKey(
+        'Course', on_delete=models.CASCADE,
+        related_name='visits', verbose_name='Einweisung')
+    participant: 'models.ForeignKey[Person]' = models.ForeignKey(
+        'Person', on_delete=models.CASCADE,
+        related_name='courses', verbose_name='Wer wurde eingewiesen?')
+    teacher: 'models.ForeignKey[Person]|models.ForeignKey[None]' =\
+        models.ForeignKey(
+             'Person', on_delete=models.SET_NULL, blank=True, null=True,
+             related_name='instructed', verbose_name='Durchgeführt von')
+    date = DateField('Datum', default=date.today)
+
+    class Meta:
+        verbose_name = 'Teilnahme'
+        verbose_name_plural = 'Teilnahmen'
+
+    def __str__(self):
+        return 'Teilnahme von {} an Einweisung „{}“ am {}'.format(
+            self.participant, self.course, self.date)
+
+    def get_absolute_url(self):
+        return reverse('course-visit:detail', kwargs={'pk': self.pk})