diff --git a/client/src/pages/learningPath/learningContentPage/blocks/AttendanceDayBlock.vue b/client/src/pages/learningPath/learningContentPage/blocks/AttendanceDayBlock.vue
index 5f1e71ab..176f059d 100644
--- a/client/src/pages/learningPath/learningContentPage/blocks/AttendanceDayBlock.vue
+++ b/client/src/pages/learningPath/learningContentPage/blocks/AttendanceDayBlock.vue
@@ -15,7 +15,7 @@ const props = defineProps<{
 }>();
 
 const attendanceDay = computed(() => {
-  return courseSessionsStore.findAttendanceDay(props.content.slug);
+  return courseSessionsStore.findAttendanceDay(props.content.id);
 });
 </script>
 
diff --git a/client/src/stores/courseSessions.ts b/client/src/stores/courseSessions.ts
index 9f3c83eb..bd7ad6d0 100644
--- a/client/src/stores/courseSessions.ts
+++ b/client/src/stores/courseSessions.ts
@@ -213,14 +213,12 @@ export const useCourseSessionsStore = defineStore("courseSessions", () => {
   }
 
   function findAttendanceDay(
-    contentSlug: string
+    contentId: number
   ): CourseSessionAttendanceDay | undefined {
     const currentCourseSession = courseSessionForRoute.value;
     if (currentCourseSession) {
-      const attendanceDays =
-        currentCourseSession.additional_json_data?.attendanceDays ?? [];
-      return attendanceDays.find(
-        (attendanceDay) => attendanceDay.learningContentSlug === contentSlug
+      return currentCourseSession.attendance_days.find(
+        (attendanceDay) => attendanceDay.learningContentId === contentId
       );
     }
   }
diff --git a/client/src/types.ts b/client/src/types.ts
index dba039fb..976daa6a 100644
--- a/client/src/types.ts
+++ b/client/src/types.ts
@@ -340,7 +340,7 @@ export interface CircleDocument {
 
 // TODO refactor, when a user can manually create these days
 export interface CourseSessionAttendanceDay {
-  learningContentSlug: string;
+  learningContentId: number;
   date: string;
   startTime: string;
   endTime: string;
@@ -360,9 +360,7 @@ export interface CourseSession {
   competence_url: string;
   course_url: string;
   media_library_url: string;
-  additional_json_data: {
-    attendanceDays?: CourseSessionAttendanceDay[];
-  };
+  attendance_days: CourseSessionAttendanceDay[];
   documents: CircleDocument[];
   users: CourseSessionUser[];
 }
diff --git a/server/vbv_lernwelt/course/management/commands/create_default_courses.py b/server/vbv_lernwelt/course/management/commands/create_default_courses.py
index 93c865a9..3f6931f9 100644
--- a/server/vbv_lernwelt/course/management/commands/create_default_courses.py
+++ b/server/vbv_lernwelt/course/management/commands/create_default_courses.py
@@ -30,7 +30,7 @@ from vbv_lernwelt.feedback.creators.create_demo_feedback import create_feedback
 from vbv_lernwelt.learnpath.create_vv_new_learning_path import (
     create_vv_new_learning_path,
 )
-from vbv_lernwelt.learnpath.models import Circle
+from vbv_lernwelt.learnpath.models import Circle, LearningContent
 from vbv_lernwelt.media_library.create_default_media_library import (
     create_default_media_library,
 )
@@ -144,18 +144,18 @@ def create_course_uk_de():
     cs = CourseSession.objects.create(
         course_id=COURSE_UK,
         title="Bern 2023 a",
-        additional_json_data={
-            "attendanceDays": [
-                {
-                    "learningContentSlug": "überbetriebliche-kurse-lp-circle-fahrzeug-lc-präsenztag-fahrzeug",
-                    "date": "2023-09-18",
-                    "startTime": "08:15",
-                    "endTime": "17:00",
-                    "location": "Handelsschule KV Bern, Zimmer 123, Eigerstrasse 16, 3012 Bern",
-                    "trainer": "Roland Grossenbacher, roland.grossenbacher@helvetia.ch",
-                }
-            ]
-        },
+        attendance_days=[
+            {
+                "learningContentId": LearningContent.objects.get(
+                    slug="überbetriebliche-kurse-lp-circle-fahrzeug-lc-präsenztag-fahrzeug"
+                ).id,
+                "date": "2023-09-18",
+                "startTime": "08:15",
+                "endTime": "17:00",
+                "location": "Handelsschule KV Bern, Zimmer 123, Eigerstrasse 16, 3012 Bern",
+                "trainer": "Roland Grossenbacher, roland.grossenbacher@helvetia.ch",
+            }
+        ],
     )
 
     # figma demo users and data
diff --git a/server/vbv_lernwelt/course/migrations/0003_auto_20230404_0837.py b/server/vbv_lernwelt/course/migrations/0003_auto_20230404_0837.py
new file mode 100644
index 00000000..43374f7a
--- /dev/null
+++ b/server/vbv_lernwelt/course/migrations/0003_auto_20230404_0837.py
@@ -0,0 +1,23 @@
+# Generated by Django 3.2.13 on 2023-04-04 06:37
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("course", "0002_initial"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="coursesession",
+            name="attendance_days",
+            field=models.JSONField(blank=True, default=list),
+        ),
+        migrations.AlterField(
+            model_name="coursesession",
+            name="additional_json_data",
+            field=models.JSONField(blank=True, default=dict),
+        ),
+    ]
diff --git a/server/vbv_lernwelt/course/models.py b/server/vbv_lernwelt/course/models.py
index 06d2d2c3..2212a95e 100644
--- a/server/vbv_lernwelt/course/models.py
+++ b/server/vbv_lernwelt/course/models.py
@@ -184,7 +184,9 @@ class CourseSession(models.Model):
     start_date = models.DateField(null=True, blank=True)
     end_date = models.DateField(null=True, blank=True)
 
-    additional_json_data = models.JSONField(default=dict)
+    attendance_days = models.JSONField(default=list, blank=True)
+
+    additional_json_data = models.JSONField(default=dict, blank=True)
 
     def __str__(self):
         return f"{self.title}"
diff --git a/server/vbv_lernwelt/course/serializers.py b/server/vbv_lernwelt/course/serializers.py
index c7b9971c..701bddac 100644
--- a/server/vbv_lernwelt/course/serializers.py
+++ b/server/vbv_lernwelt/course/serializers.py
@@ -82,6 +82,7 @@ class CourseSessionSerializer(serializers.ModelSerializer):
             "start_date",
             "end_date",
             "additional_json_data",
+            "attendance_days",
             "learning_path_url",
             "competence_url",
             "media_library_url",