diff --git a/.gitignore b/.gitignore
index a511dff6..0daeaac9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -61,8 +61,6 @@ target/
 # pyenv
 .python-version
 
-
-
 # Environments
 .venv
 venv/
@@ -76,7 +74,6 @@ venv/
 # mypy
 .mypy_cache/
 
-
 ### Node template
 # Logs
 logs
@@ -159,10 +156,6 @@ typings/
 # Local History for Visual Studio Code
 .history/
 
-
-
-
-
 ### Windows template
 # Windows thumbnail cache files
 Thumbs.db
@@ -272,6 +265,7 @@ tags
 
 ### Project template
 
+.~lock.*
 .pytest_cache/
 .ipython/
 vendors.js
diff --git a/caprover_deploy.sh b/caprover_deploy.sh
index 2cb0c455..e6bda1e6 100755
--- a/caprover_deploy.sh
+++ b/caprover_deploy.sh
@@ -26,14 +26,14 @@ function generate_default_app_name() {
 APP_NAME=${1:-$(generate_default_app_name)}
 
 # VITE_* variables need to be present at build time
-VITE_APP_ENVIRONMENT="dev-$APP_NAME"
+export VITE_APP_ENVIRONMENT="dev-$APP_NAME"
 
 if [[ "$APP_NAME" == "myvbv-stage" ]]; then
-    VITE_OAUTH_API_BASE_URL="https://vbvtst.b2clogin.com/vbvtst.onmicrosoft.com/b2c_1_signupandsignin/oauth2/v2.0/"
-    VITE_APP_ENVIRONMENT="stage-caprover"
+    export VITE_OAUTH_API_BASE_URL="https://vbvtst.b2clogin.com/vbvtst.onmicrosoft.com/b2c_1_signupandsignin/oauth2/v2.0/"
+    export VITE_APP_ENVIRONMENT="stage-caprover"
 elif [[ "$APP_NAME" == prod* ]]; then
-    VITE_OAUTH_API_BASE_URL="https://edumgr.b2clogin.com/edumgr.onmicrosoft.com/b2c_1_signupandsignin/oauth2/v2.0/"
-    VITE_APP_ENVIRONMENT=$APP_NAME
+    export VITE_OAUTH_API_BASE_URL="https://edumgr.b2clogin.com/edumgr.onmicrosoft.com/b2c_1_signupandsignin/oauth2/v2.0/"
+    export VITE_APP_ENVIRONMENT=$APP_NAME
 fi
 
 echo "Deploy to $APP_NAME"
diff --git a/client/src/main.ts b/client/src/main.ts
index bb082423..50a87bb8 100644
--- a/client/src/main.ts
+++ b/client/src/main.ts
@@ -21,6 +21,7 @@ if (appEnv.startsWith("prod")) {
 } else {
   log.setLevel("trace");
 }
+log.warn(`application started appEnv=${appEnv}`);
 
 const i18n = setupI18n();
 const app = createApp(App);
diff --git a/client/src/pages/learningPath/learningContentPage/attendanceCourse/AttendanceCourse.vue b/client/src/pages/learningPath/learningContentPage/attendanceCourse/AttendanceCourse.vue
index 2373d00e..aec81364 100644
--- a/client/src/pages/learningPath/learningContentPage/attendanceCourse/AttendanceCourse.vue
+++ b/client/src/pages/learningPath/learningContentPage/attendanceCourse/AttendanceCourse.vue
@@ -7,7 +7,10 @@
   <div class="mb-12 grid grid-cols-icon-card gap-x-4 grid-areas-icon-card">
     <it-icon-location class="w-[60px] grid-in-icon" />
     <h2 class="text-large font-bold grid-in-title">Standort</h2>
-    <p class="grid-in-value">{{ location }}</p>
+    <p v-if="location.startsWith('https://')" class="grid-in-value">
+      <a class="link" target="_blank" :href="location">{{ location }}</a>
+    </p>
+    <p v-else class="grid-in-value">{{ location }}</p>
   </div>
   <div class="grid grid-cols-icon-card content-between gap-x-4 grid-areas-icon-card">
     <it-icon-trainer class="w-[60px] grid-in-icon" />
diff --git a/server/config/settings/base.py b/server/config/settings/base.py
index 8330a516..61c931e6 100644
--- a/server/config/settings/base.py
+++ b/server/config/settings/base.py
@@ -140,9 +140,7 @@ AUTH_USER_MODEL = "core.User"
 # https://docs.djangoproject.com/en/dev/ref/settings/#login-redirect-url
 # https://docs.djangoproject.com/en/dev/ref/settings/#login-url
 
-# FIXME make configurable!?
-# LOGIN_URL = "/sso/login/"
-LOGIN_URL = "/login"
+LOGIN_URL = "/login-local"
 LOGIN_REDIRECT_URL = "/"
 
 ALLOW_LOCAL_LOGIN = env.bool("IT_ALLOW_LOCAL_LOGIN", default=DEBUG)
diff --git a/server/requirements/requirements-dev.txt b/server/requirements/requirements-dev.txt
index 62594c31..79b0692c 100644
--- a/server/requirements/requirements-dev.txt
+++ b/server/requirements/requirements-dev.txt
@@ -319,7 +319,9 @@ mypy-extensions==0.4.3
 nodeenv==1.6.0
     # via pre-commit
 openpyxl==3.1.2
-    # via wagtail
+    # via
+    #   -r requirements.in
+    #   wagtail
 packaging==21.3
     # via
     #   build
@@ -405,6 +407,7 @@ pytest-sugar==0.9.4
     # via -r requirements-dev.in
 python-dateutil==2.8.2
     # via
+    #   -r requirements.in
     #   botocore
     #   faker
 python-dotenv==0.20.0
diff --git a/server/requirements/requirements.in b/server/requirements/requirements.in
index 7910d91e..6364d87b 100644
--- a/server/requirements/requirements.in
+++ b/server/requirements/requirements.in
@@ -37,6 +37,7 @@ sendgrid
 structlog
 python-json-logger
 concurrent-log-handler
+python-dateutil
 
 wagtail>=4
 wagtail-factories>=4
@@ -47,3 +48,4 @@ azure-storage-blob
 azure-identity
 
 boto3
+openpyxl
diff --git a/server/requirements/requirements.txt b/server/requirements/requirements.txt
index b3015ddd..8e3e7d35 100644
--- a/server/requirements/requirements.txt
+++ b/server/requirements/requirements.txt
@@ -190,7 +190,9 @@ msal==1.22.0
 msal-extensions==1.0.0
     # via azure-identity
 openpyxl==3.1.2
-    # via wagtail
+    # via
+    #   -r requirements.in
+    #   wagtail
 packaging==21.3
     # via
     #   marshmallow
@@ -219,6 +221,7 @@ pyrsistent==0.18.1
     # via jsonschema
 python-dateutil==2.8.2
     # via
+    #   -r requirements.in
     #   botocore
     #   faker
 python-dotenv==0.20.0
diff --git a/server/vbv_lernwelt/core/managers.py b/server/vbv_lernwelt/core/managers.py
deleted file mode 100644
index eead0bf9..00000000
--- a/server/vbv_lernwelt/core/managers.py
+++ /dev/null
@@ -1,25 +0,0 @@
-from django.contrib.auth.base_user import BaseUserManager
-from django.contrib.auth.models import AbstractUser
-
-
-class UserManager(BaseUserManager):
-    def create_or_update_by_email(self, user_dict: dict) -> tuple[AbstractUser, bool]:
-        # create or sync user with OpenID Data
-        user, created = self.model.objects.get_or_create(
-            sso_id=user_dict["oid"],
-            defaults={
-                "email": user_dict["email"],
-                "username": user_dict["email"],
-                "first_name": user_dict["first_name"],
-                "last_name": user_dict["last_name"],
-            },
-        )
-
-        if not created:
-            user.email = user_dict["email"]
-            user.username = user_dict["email"]
-            user.first_name = user_dict["first_name"]
-            user.last_name = user_dict["last_name"]
-            user.save()
-
-        return user, created
diff --git a/server/vbv_lernwelt/core/migrations/0002_alter_user_managers.py b/server/vbv_lernwelt/core/migrations/0002_alter_user_managers.py
new file mode 100644
index 00000000..3f6b16fe
--- /dev/null
+++ b/server/vbv_lernwelt/core/migrations/0002_alter_user_managers.py
@@ -0,0 +1,20 @@
+# Generated by Django 3.2.13 on 2023-05-31 14:34
+
+import django.contrib.auth.models
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("core", "0001_initial"),
+    ]
+
+    operations = [
+        migrations.AlterModelManagers(
+            name="user",
+            managers=[
+                ("objects", django.contrib.auth.models.UserManager()),
+            ],
+        ),
+    ]
diff --git a/server/vbv_lernwelt/core/migrations/0003_alter_user_avatar_url.py b/server/vbv_lernwelt/core/migrations/0003_alter_user_avatar_url.py
new file mode 100644
index 00000000..d1e22e74
--- /dev/null
+++ b/server/vbv_lernwelt/core/migrations/0003_alter_user_avatar_url.py
@@ -0,0 +1,22 @@
+# Generated by Django 3.2.13 on 2023-06-02 12:32
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("core", "0002_alter_user_managers"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="user",
+            name="avatar_url",
+            field=models.CharField(
+                blank=True,
+                default="/static/avatars/myvbv-default-avatar.png",
+                max_length=254,
+            ),
+        ),
+    ]
diff --git a/server/vbv_lernwelt/core/models.py b/server/vbv_lernwelt/core/models.py
index 73e498f1..c1a09d96 100644
--- a/server/vbv_lernwelt/core/models.py
+++ b/server/vbv_lernwelt/core/models.py
@@ -2,8 +2,6 @@ from django.contrib.auth.models import AbstractUser
 from django.db import models
 from django.db.models import JSONField
 
-from vbv_lernwelt.core.managers import UserManager
-
 
 class User(AbstractUser):
     """
@@ -19,7 +17,9 @@ class User(AbstractUser):
 
     # FIXME: look into it...
     # objects = UserManager()
-    avatar_url = models.CharField(max_length=254, blank=True, default="")
+    avatar_url = models.CharField(
+        max_length=254, blank=True, default="/static/avatars/myvbv-default-avatar.png"
+    )
     email = models.EmailField("email address", unique=True)
     sso_id = models.UUIDField(
         "SSO subscriber ID", unique=True, null=True, blank=True, default=None
@@ -27,8 +27,6 @@ class User(AbstractUser):
     additional_json_data = JSONField(default=dict, blank=True)
     language = models.CharField(max_length=2, choices=LANGUAGE_CHOICES, default="de")
 
-    objects = UserManager()
-
 
 class SecurityRequestResponseLog(models.Model):
     label = models.CharField(max_length=255, blank=True, default="")
diff --git a/server/vbv_lernwelt/course/admin.py b/server/vbv_lernwelt/course/admin.py
index 450d187b..ab5d2bbe 100644
--- a/server/vbv_lernwelt/course/admin.py
+++ b/server/vbv_lernwelt/course/admin.py
@@ -20,6 +20,7 @@ class CourseSessionAdmin(admin.ModelAdmin):
     list_display = [
         "title",
         "course",
+        "import_id",
         "start_date",
         "end_date",
         "created_at",
@@ -31,8 +32,9 @@ class CourseSessionAdmin(admin.ModelAdmin):
 class CourseSessionUserAdmin(admin.ModelAdmin):
     date_hierarchy = "created_at"
     list_display = [
-        "course_session",
         "user",
+        "course_session",
+        "role",
         "created_at",
         "updated_at",
     ]
@@ -43,12 +45,12 @@ class CourseSessionUserAdmin(admin.ModelAdmin):
         "course_session__title",
     ]
     list_filter = [
-        "course_session__course",
         "course_session",
+        "role",
     ]
 
     fieldsets = [
-        (None, {"fields": ("user", "course_session")}),
+        (None, {"fields": ("user", "course_session", "role")}),
         (
             "Expert/Trainer",
             {
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 f681bc5b..e25bb0fc 100644
--- a/server/vbv_lernwelt/course/management/commands/create_default_courses.py
+++ b/server/vbv_lernwelt/course/management/commands/create_default_courses.py
@@ -1,3 +1,4 @@
+import os
 import random
 
 import djclick as click
@@ -43,9 +44,19 @@ from vbv_lernwelt.course.creators.uk_training_course import (
 from vbv_lernwelt.course.creators.versicherungsvermittlerin import (
     create_versicherungsvermittlerin_with_categories,
 )
-from vbv_lernwelt.course.models import CoursePage, CourseSession, CourseSessionUser
+from vbv_lernwelt.course.models import (
+    Course,
+    CoursePage,
+    CourseSession,
+    CourseSessionUser,
+)
 from vbv_lernwelt.course.services import mark_course_completion
 from vbv_lernwelt.feedback.creators.create_demo_feedback import create_feedback
+from vbv_lernwelt.importer.services import (
+    import_course_sessions_from_excel,
+    import_students_from_excel,
+    import_trainers_from_excel,
+)
 from vbv_lernwelt.learnpath.create_vv_new_learning_path import (
     create_vv_new_learning_path,
 )
@@ -439,21 +450,24 @@ def create_course_training_de():
     create_uk_training_competence_profile(course_id=COURSE_UK_TRAINING)
     create_default_media_library(course_id=COURSE_UK_TRAINING)
 
-    cs = CourseSession.objects.create(
-        course_id=COURSE_UK_TRAINING,
-        title="Demo-Tag",
-        attendance_courses=[
-            {
-                "learningContentId": LearningContentAttendanceCourse.objects.get(
-                    slug=f"{course.slug}-lp-circle-fahrzeug-lc-präsenzkurs-fahrzeug"
-                ).id,
-                "start": "2023-05-23T08:30:00+0200",
-                "end": "2023-05-23T17:00:00+0200",
-                "location": "Handelsschule KV Bern, Zimmer 123, Eigerstrasse 16, 3012 Bern",
-                "trainer": "Roland Grossenbacher, roland.grossenbacher@helvetia.ch",
-            }
-        ],
-        assignment_details_list=[
+    current_dir = os.path.dirname(os.path.realpath(__file__))
+    print(current_dir)
+    course = Course.objects.get(id=COURSE_UK_TRAINING)
+    import_course_sessions_from_excel(
+        course,
+        f"{current_dir}/../../../importer/tests/Schulungen_Durchfuehrung_Trainer.xlsx",
+    )
+    import_trainers_from_excel(
+        course,
+        f"{current_dir}/../../../importer/tests/Schulungen_Durchfuehrung_Trainer.xlsx",
+    )
+    import_students_from_excel(
+        course,
+        f"{current_dir}/../../../importer/tests/Schulungen_Teilnehmende.xlsx",
+    )
+
+    for cs in CourseSession.objects.filter(course_id=COURSE_UK_TRAINING):
+        cs.assignment_details_list = [
             {
                 "learningContentId": LearningContentAssignment.objects.get(
                     slug=f"{course.slug}-lp-circle-fahrzeug-lc-überprüfen-einer-motorfahrzeug-versicherungspolice"
@@ -468,5 +482,34 @@ def create_course_training_de():
                 "submissionDeadlineDateTimeUtc": "2023-06-13T19:00:00Z",
                 "evaluationDeadlineDateTimeUtc": "2023-06-27T19:00:00Z",
             },
-        ],
-    )
+        ]
+        cs.save()
+
+    # attach users as trainers to ÜK course
+    course_uk = Course.objects.filter(id=COURSE_UK).first()
+    if course_uk:
+        users = [
+            csu.user
+            for csu in CourseSessionUser.objects.filter(
+                course_session__course_id=COURSE_UK_TRAINING
+            )
+        ]
+
+        cs = CourseSession.objects.get(course_id=COURSE_UK, title="Bern 2023 a")
+
+        for user in users:
+            csu, _created = CourseSessionUser.objects.get_or_create(
+                course_session_id=cs.id, user_id=user.id
+            )
+            csu.role = CourseSessionUser.Role.EXPERT
+            csu.expert.add(
+                Circle.objects.get(slug="überbetriebliche-kurse-lp-circle-kickoff")
+            )
+            csu.expert.add(
+                Circle.objects.get(slug="überbetriebliche-kurse-lp-circle-basis")
+            )
+            csu.expert.add(
+                Circle.objects.get(slug="überbetriebliche-kurse-lp-circle-fahrzeug")
+            )
+
+            csu.save()
diff --git a/server/vbv_lernwelt/course/migrations/0004_import_fields.py b/server/vbv_lernwelt/course/migrations/0004_import_fields.py
new file mode 100644
index 00000000..cc7f16c7
--- /dev/null
+++ b/server/vbv_lernwelt/course/migrations/0004_import_fields.py
@@ -0,0 +1,38 @@
+# Generated by Django 3.2.13 on 2023-05-31 15:59
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("course", "0003_rename_attendance_days_coursesession_attendance_courses"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="coursesession",
+            name="generation",
+            field=models.TextField(blank=True, default=""),
+        ),
+        migrations.AddField(
+            model_name="coursesession",
+            name="group",
+            field=models.TextField(blank=True, default=""),
+        ),
+        migrations.AddField(
+            model_name="coursesession",
+            name="import_id",
+            field=models.TextField(blank=True, default=""),
+        ),
+        migrations.AddField(
+            model_name="coursesession",
+            name="region",
+            field=models.TextField(blank=True, default=""),
+        ),
+        migrations.AlterField(
+            model_name="coursesession",
+            name="title",
+            field=models.TextField(unique=True),
+        ),
+    ]
diff --git a/server/vbv_lernwelt/course/models.py b/server/vbv_lernwelt/course/models.py
index f0bd86b2..2a49e8d9 100644
--- a/server/vbv_lernwelt/course/models.py
+++ b/server/vbv_lernwelt/course/models.py
@@ -215,7 +215,13 @@ class CourseSession(models.Model):
     updated_at = models.DateTimeField(auto_now=True)
 
     course = models.ForeignKey("course.Course", on_delete=models.CASCADE)
-    title = models.TextField()
+    title = models.TextField(unique=True)
+
+    import_id = models.TextField(blank=True, default="")
+
+    generation = models.TextField(blank=True, default="")
+    region = models.TextField(blank=True, default="")
+    group = models.TextField(blank=True, default="")
 
     start_date = models.DateField(null=True, blank=True)
     end_date = models.DateField(null=True, blank=True)
diff --git a/server/vbv_lernwelt/importer/__init__.py b/server/vbv_lernwelt/importer/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/server/vbv_lernwelt/importer/admin.py b/server/vbv_lernwelt/importer/admin.py
new file mode 100644
index 00000000..8c38f3f3
--- /dev/null
+++ b/server/vbv_lernwelt/importer/admin.py
@@ -0,0 +1,3 @@
+from django.contrib import admin
+
+# Register your models here.
diff --git a/server/vbv_lernwelt/importer/apps.py b/server/vbv_lernwelt/importer/apps.py
new file mode 100644
index 00000000..a0f916a8
--- /dev/null
+++ b/server/vbv_lernwelt/importer/apps.py
@@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class SsoConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "vbv_lernwelt.importer"
diff --git a/server/vbv_lernwelt/importer/migrations/__init__.py b/server/vbv_lernwelt/importer/migrations/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/server/vbv_lernwelt/importer/models.py b/server/vbv_lernwelt/importer/models.py
new file mode 100644
index 00000000..e69de29b
diff --git a/server/vbv_lernwelt/importer/services.py b/server/vbv_lernwelt/importer/services.py
new file mode 100644
index 00000000..d75fe9a0
--- /dev/null
+++ b/server/vbv_lernwelt/importer/services.py
@@ -0,0 +1,223 @@
+from typing import Any, Dict
+
+import structlog
+from openpyxl.reader.excel import load_workbook
+
+from vbv_lernwelt.core.models import User
+from vbv_lernwelt.course.models import Course, CourseSession, CourseSessionUser
+from vbv_lernwelt.importer.utils import (
+    calc_header_tuple_list_from_pyxl_sheet,
+    parse_circle_group_string,
+    try_parse_datetime,
+)
+from vbv_lernwelt.learnpath.models import Circle, LearningContentAttendanceCourse
+
+logger = structlog.get_logger(__name__)
+
+
+def create_or_update_user(
+    email: str, first_name: str = "", last_name: str = "", sso_id: str = None
+):
+    logger.debug(
+        "create_or_update_user",
+        email=email,
+        first_name=first_name,
+        last_name=last_name,
+        sso_id=sso_id,
+        label="import",
+    )
+    user = None
+    if sso_id:
+        user_qs = User.objects.filter(sso_id=sso_id)
+        if user_qs.exists():
+            user = user_qs.first()
+
+    if not user:
+        user_qs = User.objects.filter(email=email)
+        if user_qs.exists():
+            user = user_qs.first()
+
+    if not user:
+        # create user
+        user = User(sso_id=sso_id, email=email, username=email)
+
+    user.email = email
+    user.sso_id = user.sso_id or sso_id
+    user.first_name = first_name or user.first_name
+    user.last_name = last_name or user.last_name
+    user.username = email
+    user.set_unusable_password()
+    user.save()
+
+    return user
+
+
+def import_course_sessions_from_excel(course: Course, filename: str):
+    workbook = load_workbook(filename=filename)
+    sheet = workbook["Schulungen Durchführung"]
+
+    tuple_list = calc_header_tuple_list_from_pyxl_sheet(sheet)
+    for row in tuple_list:
+        create_or_update_course_session(course, dict(row), circles=["Fahrzeug"])
+
+
+def create_or_update_course_session(course: Course, data: Dict[str, Any], circles=None):
+    """
+    :param data: the following keys are required to process the data: Generation, Region, Klasse
+    :return:
+    """
+
+    logger.debug(
+        "create_or_update_course_session",
+        course=course.title,
+        data=data,
+        label="import",
+    )
+
+    if circles is None:
+        circles = []
+
+    # TODO: validation
+    group = data["Klasse"].strip()
+    import_id = data["ID"].strip()
+
+    generation = str(data["Generation"]).strip()
+    region = data["Region"].strip()
+
+    title = f"{region} {generation} {group}"
+
+    cs, _created = CourseSession.objects.get_or_create(
+        import_id=import_id, group=group, course=course
+    )
+
+    cs.additional_json_data["import_data"] = data
+    cs.save()
+
+    cs.title = title
+    cs.generation = generation
+    cs.region = region
+    cs.group = group
+    cs.import_id = import_id
+
+    cs.save()
+
+    for circle in circles:
+        attendance_course_lp_qs = LearningContentAttendanceCourse.objects.filter(
+            slug=f"{course.slug}-lp-circle-{circle.lower()}-lc-präsenzkurs-{circle.lower()}"
+        )
+        if attendance_course_lp_qs.exists():
+            cs.attendance_courses.append(
+                {
+                    "learningContentId": attendance_course_lp_qs.first().id,
+                    "start": try_parse_datetime(data[f"{circle} Start"])[1].isoformat(),
+                    "end": try_parse_datetime(data[f"{circle} Ende"])[1].isoformat(),
+                    "location": data[f"{circle} Raum"],
+                    "trainer": "",
+                }
+            )
+            cs.save()
+
+    return cs
+
+
+def import_trainers_from_excel(course: Course, filename: str):
+    workbook = load_workbook(filename=filename)
+    sheet = workbook["Schulungen Trainer"]
+
+    tuple_list = calc_header_tuple_list_from_pyxl_sheet(sheet)
+    for row in tuple_list:
+        create_or_update_trainer(course, dict(row))
+
+
+def create_or_update_trainer(course: Course, data: Dict[str, Any]):
+    logger.debug(
+        "create_or_update_trainer",
+        course=course.title,
+        data=data,
+        label="import",
+    )
+
+    user = create_or_update_user(
+        email=data["Email"],
+        first_name=data["Vorname"],
+        last_name=data["Name"],
+    )
+
+    # TODO: handle language
+
+    groups = [g.strip() for g in data["Klasse"].strip().split(",")]
+
+    # general expert handling
+    for group in groups:
+        import_id = f"{data['Generation'].strip()} {group}"
+        course_session = CourseSession.objects.filter(
+            import_id=import_id, group=group, course=course
+        ).first()
+        if course_session:
+            csu, _created = CourseSessionUser.objects.get_or_create(
+                course_session_id=course_session.id, user_id=user.id
+            )
+            csu.role = CourseSessionUser.Role.EXPERT
+            csu.save()
+
+    # circle expert handling
+    circle_data = parse_circle_group_string(data["Circles"])
+    for circle_string in circle_data:
+        parts = circle_string.split("(", 1)
+        circle_name = parts[0].strip()
+        groups = [g.strip() for g in parts[1].rstrip(")").strip().split(",")]
+
+        # print(circle_name, groups)
+        for group in groups:
+            course_session = CourseSession.objects.filter(
+                import_id=import_id, group=group, course=course
+            ).first()
+            circle = Circle.objects.filter(
+                slug=f"{course.slug}-lp-circle-{circle_name.lower()}"
+            ).first()
+
+            if course_session and circle:
+                csu = CourseSessionUser.objects.filter(
+                    course_session_id=course_session.id, user_id=user.id
+                ).first()
+                if csu:
+                    csu.expert.add(circle)
+                    csu.save()
+
+
+def import_students_from_excel(course: Course, filename: str):
+    workbook = load_workbook(filename=filename)
+    sheet = workbook.active
+
+    tuple_list = calc_header_tuple_list_from_pyxl_sheet(sheet)
+    for row in tuple_list:
+        create_or_update_student(course, dict(row))
+
+
+def create_or_update_student(course: Course, data: Dict[str, Any]):
+    logger.debug(
+        "create_or_update_student",
+        course=course.title,
+        data=data,
+        label="import",
+    )
+
+    user = create_or_update_user(
+        email=data["Email"],
+        first_name=data["Vorname"],
+        last_name=data["Name"],
+    )
+
+    # TODO: handle language
+
+    # general expert handling
+    import_ids = [i.strip() for i in data["Durchführungen"].split(",")]
+    for import_id in import_ids:
+        course_session = CourseSession.objects.filter(
+            import_id=import_id, course=course
+        ).first()
+        if course_session:
+            csu, _created = CourseSessionUser.objects.get_or_create(
+                course_session_id=course_session.id, user_id=user.id
+            )
+            csu.save()
diff --git a/server/vbv_lernwelt/importer/tests/Schulungen_Durchfuehrung_Trainer.xlsx b/server/vbv_lernwelt/importer/tests/Schulungen_Durchfuehrung_Trainer.xlsx
new file mode 100644
index 00000000..05311f3e
Binary files /dev/null and b/server/vbv_lernwelt/importer/tests/Schulungen_Durchfuehrung_Trainer.xlsx differ
diff --git a/server/vbv_lernwelt/importer/tests/Schulungen_Teilnehmende.xlsx b/server/vbv_lernwelt/importer/tests/Schulungen_Teilnehmende.xlsx
new file mode 100644
index 00000000..f2f57358
Binary files /dev/null and b/server/vbv_lernwelt/importer/tests/Schulungen_Teilnehmende.xlsx differ
diff --git a/server/vbv_lernwelt/importer/tests/test_import_course_sessions.py b/server/vbv_lernwelt/importer/tests/test_import_course_sessions.py
new file mode 100644
index 00000000..adf1c715
--- /dev/null
+++ b/server/vbv_lernwelt/importer/tests/test_import_course_sessions.py
@@ -0,0 +1,129 @@
+import os
+
+from django.test import TestCase
+from openpyxl.reader.excel import load_workbook
+
+from vbv_lernwelt.course.creators.test_course import create_test_course
+from vbv_lernwelt.course.models import CourseSession
+from vbv_lernwelt.importer.services import create_or_update_course_session
+from vbv_lernwelt.importer.utils import calc_header_tuple_list_from_pyxl_sheet
+
+test_dir = os.path.dirname(os.path.abspath(__file__))
+
+
+class ImportCourseSessionTestCase(TestCase):
+    def setUp(self):
+        self.course = create_test_course(include_vv=False)
+
+    def test_import_excel_file(self):
+        workbook = load_workbook(
+            filename=f"{test_dir}/Schulungen_Durchfuehrung_Trainer.xlsx"
+        )
+        sheet = workbook["Schulungen Durchführung"]
+
+        tuple_list = calc_header_tuple_list_from_pyxl_sheet(sheet)
+        for row in tuple_list:
+            print(row)
+            create_or_update_course_session(
+                self.course, dict(row), circles=["Fahrzeug"]
+            )
+
+        self.assertEqual(CourseSession.objects.count(), 6)
+
+
+class CreateOrUpdateCourseSessionTestCase(TestCase):
+    def setUp(self):
+        self.course = create_test_course(include_vv=False)
+
+    def test_create_course_session(self):
+        row = [
+            ("ID", "DE 2023 A"),
+            ("Generation", 2023),
+            ("Region", "Deutschschweiz"),
+            ("Klasse", "A"),
+            ("Fahrzeug Start", "06.06.2023, 13:30"),
+            ("Fahrzeug Ende", "06.06.2023, 15:00"),
+            (
+                "Fahrzeug Raum",
+                "https://teams.microsoft.com/l/meetup-join/19%3ameeting_N2I5YzViZTQtYTM2Ny00OTYwLTgzNzAtYWI4OTQzODcxNTlj%40thread.v2/0?context=%7b%22Tid%22%3a%22fedd03c8-a756-4803-8f27-0db8f7c488f2%22%2c%22Oid%22%3a%22f92e6382-3884-4e71-a2fd-b305a75d9812%22%7d",
+            ),
+            ("Fahrzeug Standort", None),
+            ("Fahrzeug Adresse", None),
+        ]
+
+        data = dict(row)
+
+        cs = create_or_update_course_session(self.course, data, circles=["Fahrzeug"])
+
+        self.assertEqual(cs.import_id, "DE 2023 A")
+        self.assertEqual(cs.title, "Deutschschweiz 2023 A")
+        self.assertEqual(cs.generation, "2023")
+        self.assertEqual(cs.region, "Deutschschweiz")
+        self.assertEqual(cs.group, "A")
+
+        attendance_course = cs.attendance_courses[0]
+        attendance_course = {
+            k: v
+            for k, v in attendance_course.items()
+            if k not in ["learningContentId", "location"]
+        }
+
+        self.assertDictEqual(
+            attendance_course,
+            {
+                "start": "2023-06-06T13:30:00",
+                "end": "2023-06-06T15:00:00",
+                "trainer": "",
+            },
+        )
+
+    def test_update_course_session(self):
+        cs = CourseSession.objects.create(
+            course_id=self.course.id,
+            title="Deutschschweiz 2023 A",
+            import_id="DE 2023",
+            group="A",
+        )
+
+        row = [
+            ("ID", "DE 2023"),
+            ("Generation", 2023),
+            ("Region", "Deutschschweiz"),
+            ("Klasse", "A"),
+            ("Fahrzeug Start", "06.06.2023, 13:30"),
+            ("Fahrzeug Ende", "06.06.2023, 15:00"),
+            (
+                "Fahrzeug Raum",
+                "https://teams.microsoft.com/l/meetup-join/19%3ameeting_N2I5YzViZTQtYTM2Ny00OTYwLTgzNzAtYWI4OTQzODcxNTlj%40thread.v2/0?context=%7b%22Tid%22%3a%22fedd03c8-a756-4803-8f27-0db8f7c488f2%22%2c%22Oid%22%3a%22f92e6382-3884-4e71-a2fd-b305a75d9812%22%7d",
+            ),
+            ("Fahrzeug Standort", None),
+            ("Fahrzeug Adresse", None),
+        ]
+
+        data = dict(row)
+
+        cs = create_or_update_course_session(self.course, data, circles=["Fahrzeug"])
+
+        self.assertEqual(1, CourseSession.objects.count())
+
+        self.assertEqual(cs.import_id, "DE 2023")
+        self.assertEqual(cs.title, "Deutschschweiz 2023 A")
+        self.assertEqual(cs.generation, "2023")
+        self.assertEqual(cs.region, "Deutschschweiz")
+        self.assertEqual(cs.group, "A")
+
+        attendance_course = cs.attendance_courses[0]
+        attendance_course = {
+            k: v
+            for k, v in attendance_course.items()
+            if k not in ["learningContentId", "location"]
+        }
+
+        self.assertDictEqual(
+            attendance_course,
+            {
+                "start": "2023-06-06T13:30:00",
+                "end": "2023-06-06T15:00:00",
+                "trainer": "",
+            },
+        )
diff --git a/server/vbv_lernwelt/importer/tests/test_import_students.py b/server/vbv_lernwelt/importer/tests/test_import_students.py
new file mode 100644
index 00000000..500299b0
--- /dev/null
+++ b/server/vbv_lernwelt/importer/tests/test_import_students.py
@@ -0,0 +1,76 @@
+import os
+from datetime import datetime
+
+from django.test import TestCase
+from openpyxl.reader.excel import load_workbook
+
+from vbv_lernwelt.course.creators.test_course import create_test_course
+from vbv_lernwelt.course.models import CourseSession, CourseSessionUser
+from vbv_lernwelt.importer.services import create_or_update_student
+from vbv_lernwelt.importer.utils import calc_header_tuple_list_from_pyxl_sheet
+
+test_dir = os.path.dirname(os.path.abspath(__file__))
+
+
+class ImportStudentsTestCase(TestCase):
+    def setUp(self):
+        self.course = create_test_course(include_vv=False)
+        self.course_session_a = CourseSession.objects.create(
+            course=self.course,
+            title="Deutschschweiz 2023 A",
+            import_id="DE 2023 A",
+            group="A",
+        )
+
+    def test_import_excel_file(self):
+        workbook = load_workbook(filename=f"{test_dir}/Schulungen_Teilnehmende.xlsx")
+        sheet = workbook.active
+
+        tuple_list = calc_header_tuple_list_from_pyxl_sheet(sheet)
+        for row in tuple_list:
+            print(row)
+            create_or_update_student(self.course, dict(row))
+
+        self.assertEqual(CourseSessionUser.objects.count(), 28)
+
+
+class CreateOrUpdateStudentTestCase(TestCase):
+    def setUp(self):
+        self.course = create_test_course(include_vv=False)
+        self.course_session_a = CourseSession.objects.create(
+            course=self.course,
+            title="Deutschschweiz 2023 A",
+            import_id="DE 2023 A",
+            group="A",
+        )
+
+    def test_create_student(self):
+        row = [
+            ("Name", "Rascher"),
+            ("Vorname", "Barbara"),
+            ("Email", "barbara.rascher@vbv-afa.ch"),
+            ("Sprache", "de"),
+            ("Durchführungen", "DE 2023 A"),
+            ("Datum", datetime(2023, 9, 6, 0, 0)),
+            (None, "VBV"),
+            (None, None),
+            (None, None),
+            (None, None),
+            (None, None),
+        ]
+
+        create_or_update_student(self.course, dict(row))
+
+        self.assertEqual(
+            CourseSessionUser.objects.filter(
+                user__email="barbara.rascher@vbv-afa.ch"
+            ).count(),
+            1,
+        )
+
+        csu = CourseSessionUser.objects.get(
+            course_session=self.course_session_a,
+        )
+
+        self.assertEqual(csu.role, CourseSessionUser.Role.MEMBER)
+        self.assertEqual(csu.user.email, "barbara.rascher@vbv-afa.ch")
diff --git a/server/vbv_lernwelt/importer/tests/test_import_trainers.py b/server/vbv_lernwelt/importer/tests/test_import_trainers.py
new file mode 100644
index 00000000..383319fa
--- /dev/null
+++ b/server/vbv_lernwelt/importer/tests/test_import_trainers.py
@@ -0,0 +1,88 @@
+import os
+
+from django.test import TestCase
+from openpyxl.reader.excel import load_workbook
+
+from vbv_lernwelt.course.creators.test_course import create_test_course
+from vbv_lernwelt.course.models import CourseSession, CourseSessionUser
+from vbv_lernwelt.importer.services import create_or_update_trainer
+from vbv_lernwelt.importer.utils import calc_header_tuple_list_from_pyxl_sheet
+
+test_dir = os.path.dirname(os.path.abspath(__file__))
+
+
+class ImportTrainerTestCase(TestCase):
+    def setUp(self):
+        self.course = create_test_course(include_vv=False)
+        self.course_session_a = CourseSession.objects.create(
+            course=self.course,
+            title="Deutschschweiz 2023 A",
+            import_id="DE 2023 A",
+            group="A",
+        )
+        self.course_session_a = CourseSession.objects.create(
+            course=self.course,
+            title="Deutschschweiz 2023 B",
+            import_id="DE 2023 B",
+            group="B",
+        )
+
+    def test_import_excel_file(self):
+        workbook = load_workbook(
+            filename=f"{test_dir}/Schulungen_Durchfuehrung_Trainer.xlsx"
+        )
+        sheet = workbook["Schulungen Trainer"]
+
+        tuple_list = calc_header_tuple_list_from_pyxl_sheet(sheet)
+        for row in tuple_list:
+            print(row)
+            create_or_update_trainer(self.course, dict(row))
+
+        self.assertEqual(CourseSessionUser.objects.count(), 4)
+
+
+class CreateOrUpdateTrainerTestCase(TestCase):
+    def setUp(self):
+        self.course = create_test_course(include_vv=False)
+        self.course_session_a = CourseSession.objects.create(
+            course=self.course,
+            title="Deutschschweiz 2023 A",
+            import_id="DE 2023 A",
+            group="A",
+        )
+        self.course_session_a = CourseSession.objects.create(
+            course=self.course,
+            title="Deutschschweiz 2023 B",
+            import_id="DE 2023 B",
+            group="B",
+        )
+
+    def test_create_trainer(self):
+        row = [
+            ("Name", "Hänni"),
+            ("Vorname", "Fabienne"),
+            ("Email", "fabienne.haenni@vbv-afa.ch"),
+            ("Sprache", "de"),
+            ("Generation", "DE 2023"),
+            ("Klasse", "A, B"),
+            ("Circles", "Fahrzeug (A, B), Reisen (A), KMU (B)"),
+            ("Status Referenten", "ok"),
+            (None, "Schulung D"),
+        ]
+
+        create_or_update_trainer(self.course, dict(row))
+
+        self.assertEqual(
+            CourseSessionUser.objects.filter(
+                user__email="fabienne.haenni@vbv-afa.ch"
+            ).count(),
+            2,
+        )
+
+        csu = CourseSessionUser.objects.get(
+            course_session=self.course_session_a,
+        )
+
+        self.assertEqual(csu.role, CourseSessionUser.Role.EXPERT)
+        self.assertEqual(csu.user.email, "fabienne.haenni@vbv-afa.ch")
+        self.assertEqual(csu.expert.all().first().title, "Fahrzeug")
diff --git a/server/vbv_lernwelt/importer/tests/test_services.py b/server/vbv_lernwelt/importer/tests/test_services.py
new file mode 100644
index 00000000..c39aded5
--- /dev/null
+++ b/server/vbv_lernwelt/importer/tests/test_services.py
@@ -0,0 +1,94 @@
+from django.test import TestCase
+
+from vbv_lernwelt.core.models import User
+from vbv_lernwelt.importer.services import create_or_update_user
+
+
+class CreateOrUpdateUserTestCase(TestCase):
+    def test_create_user(self):
+        u = create_or_update_user(
+            email="daniel@example.com",
+            first_name="Daniel",
+            last_name="Egger",
+            sso_id="12229620-81ea-483d-8d96-6ba8be5f9eb7",
+        )
+
+        saved_user = User.objects.get(id=u.id)
+
+        self.assertEqual(saved_user.email, "daniel@example.com")
+        self.assertEqual(saved_user.username, "daniel@example.com")
+        self.assertEqual(saved_user.first_name, "Daniel")
+        self.assertEqual(saved_user.last_name, "Egger")
+        self.assertEqual(str(saved_user.sso_id), "12229620-81ea-483d-8d96-6ba8be5f9eb7")
+
+    def test_update_existing_user_with_oid(self):
+        User.objects.create(
+            email="daniel@example.com",
+            username="daniel@example.com",
+            first_name="Daniel",
+            last_name="Egger",
+        )
+
+        create_or_update_user(
+            email="daniel@example.com",
+            last_name="Egger",
+            sso_id="12229620-81ea-483d-8d96-6ba8be5f9eb7",
+        )
+
+        self.assertEqual(1, User.objects.count())
+        user = User.objects.first()
+
+        self.assertEqual(user.email, "daniel@example.com")
+        self.assertEqual(user.username, "daniel@example.com")
+        self.assertEqual(user.first_name, "Daniel")
+        self.assertEqual(user.last_name, "Egger")
+        self.assertEqual(str(user.sso_id), "12229620-81ea-483d-8d96-6ba8be5f9eb7")
+
+    def test_update_existing_user_with_new_last_name(self):
+        User.objects.create(
+            email="daniel@example.com",
+            username="daniel@example.com",
+            first_name="Daniel",
+            last_name="Egger",
+            sso_id="12229620-81ea-483d-8d96-6ba8be5f9eb7",
+        )
+
+        create_or_update_user(
+            email="daniel@example.com",
+            first_name="Daniel",
+            last_name="Marro",
+        )
+
+        self.assertEqual(1, User.objects.count())
+        user = User.objects.first()
+
+        self.assertEqual(user.email, "daniel@example.com")
+        self.assertEqual(user.username, "daniel@example.com")
+        self.assertEqual(user.first_name, "Daniel")
+        self.assertEqual(user.last_name, "Marro")
+        self.assertEqual(str(user.sso_id), "12229620-81ea-483d-8d96-6ba8be5f9eb7")
+
+    def test_update_existing_user_with_new_email(self):
+        User.objects.create(
+            email="daniel@example.com",
+            username="daniel@example.com",
+            first_name="Daniel",
+            last_name="Egger",
+            sso_id="12229620-81ea-483d-8d96-6ba8be5f9eb7",
+        )
+
+        create_or_update_user(
+            email="danu@example.com",
+            first_name="Daniel",
+            last_name="Egger",
+            sso_id="12229620-81ea-483d-8d96-6ba8be5f9eb7",
+        )
+
+        self.assertEqual(1, User.objects.count())
+        user = User.objects.first()
+
+        self.assertEqual(user.email, "danu@example.com")
+        self.assertEqual(user.username, "danu@example.com")
+        self.assertEqual(user.first_name, "Daniel")
+        self.assertEqual(user.last_name, "Egger")
+        self.assertEqual(str(user.sso_id), "12229620-81ea-483d-8d96-6ba8be5f9eb7")
diff --git a/server/vbv_lernwelt/importer/tests/test_utils.py b/server/vbv_lernwelt/importer/tests/test_utils.py
new file mode 100644
index 00000000..69be4b32
--- /dev/null
+++ b/server/vbv_lernwelt/importer/tests/test_utils.py
@@ -0,0 +1,192 @@
+from datetime import date, datetime
+from unittest import TestCase
+
+from vbv_lernwelt.importer.utils import (
+    parse_circle_group_string,
+    try_parse_date,
+    try_parse_datetime,
+    try_parse_int,
+)
+
+
+class TryParseDateTestCase(TestCase):
+    def test_wrongData_returnsFalseAndValue(self):
+        flag, value = try_parse_date("nonsense")
+
+        self.assertFalse(flag)
+        self.assertEqual("nonsense", value)
+
+    def test_isoDate_returnsCorrectDate(self):
+        flag, value = try_parse_date("2015-01-20")
+
+        self.assertTrue(flag)
+        self.assertEqual(date(2015, 1, 20), value)
+
+    def test_isoDateWithTime_returnsCorrectDate(self):
+        flag, value = try_parse_date("2015-01-20T15:21")
+
+        self.assertTrue(flag)
+        self.assertEqual(date(2015, 1, 20), value)
+
+    def test_isoDateWithTime2_returnsCorrectDate(self):
+        flag, value = try_parse_date("2018-05-03T00:00:00")
+
+        self.assertTrue(flag)
+        self.assertEqual(date(2018, 5, 3), value)
+
+    def test_swissDate_returnsCorrectDate(self):
+        flag, value = try_parse_date("01.05.2018")
+
+        self.assertTrue(flag)
+        self.assertEqual(date(2018, 5, 1), value)
+
+    def test_wrongIsoDate_returnsFalseAndValue(self):
+        flag, value = try_parse_date("2015-14-40")
+
+        self.assertFalse(flag)
+        self.assertEqual("2015-14-40", value)
+
+    def test_inputIsDate_returnsDate(self):
+        flag, value = try_parse_date(date(2016, 5, 1))
+
+        self.assertTrue(flag)
+        self.assertEqual(date(2016, 5, 1), value)
+
+    def test_inputIsNumber_returnsFalseAndNumber(self):
+        flag, value = try_parse_date(123)
+
+        self.assertFalse(flag)
+        self.assertEqual(123, value)
+
+    def test_inputIsNumberString_returnsFalseAndString(self):
+        flag, value = try_parse_date("56")
+
+        self.assertFalse(flag)
+        self.assertEqual("56", value)
+
+    def test_inputIsFloatString_returnsFalseAndString(self):
+        flag, value = try_parse_date("3.14")
+
+        self.assertFalse(flag)
+        self.assertEqual("3.14", value)
+
+    def test_inputIsShortDateWithoutYear_returnsFalseAndString(self):
+        flag, value = try_parse_date("11-01")
+
+        self.assertFalse(flag)
+        self.assertEqual("11-01", value)
+
+
+class TryParseInt(TestCase):
+    def test_int_works(self):
+        flag, value = try_parse_int(123)
+
+        self.assertTrue(flag)
+        self.assertEqual(123, value)
+
+    def test_valid_string_works(self):
+        flag, value = try_parse_int("123")
+
+        self.assertTrue(flag)
+        self.assertEqual(123, value)
+
+    def test_invalid_string_breaks(self):
+        flag, value = try_parse_int("123qwer")
+
+        self.assertFalse(flag)
+        self.assertEqual("123qwer", value)
+
+    def test_invalid_string_returns_default(self):
+        flag, value = try_parse_int("123qwer", 0)
+
+        self.assertFalse(flag)
+        self.assertEqual(0, value)
+
+
+class TryParseDateTimeTestCase(TestCase):
+    def test_isoDateTime_returnsCorrectDateTime(self):
+        flag, value = try_parse_datetime("2016-05-31T10:00:00.000000")
+
+        self.assertTrue(flag)
+        self.assertEqual(datetime(2016, 5, 31, 10, 0, 0), value)
+
+    def test_isoDateTimeWithoutSeconds_returnsCorrectDateTime(self):
+        flag, value = try_parse_datetime("2016-05-02T10:00")
+
+        self.assertTrue(flag)
+        self.assertEqual(datetime(2016, 5, 2, 10, 0, 0), value)
+
+    def test_isoDateWithoutTime_returnTrueAndDatetimeWithZeroHour(self):
+        flag, value = try_parse_datetime("2016-05-31")
+
+        self.assertTrue(flag)
+        self.assertEqual(datetime(2016, 5, 31), value)
+
+    def test_isoDateWithSpaceBeforeTime_returnTrueAndDatetimeWithZeroHour(self):
+        flag, value = try_parse_datetime("2016-05-03 14:12")
+
+        self.assertTrue(flag)
+        self.assertEqual(datetime(2016, 5, 3, 14, 12), value)
+
+    def test_swissDateWithTime_returnTrueAndDatetime(self):
+        flag, value = try_parse_datetime("01.05.2018 15:20")
+
+        self.assertTrue(flag)
+        self.assertEqual(datetime(2018, 5, 1, 15, 20), value)
+
+    def test_swissDateWithTimeWithMultipleSpaces_returnTrueAndDatetime(self):
+        flag, value = try_parse_datetime("01 .05. 2018    15:20")
+
+        self.assertTrue(flag)
+        self.assertEqual(datetime(2018, 5, 1, 15, 20), value)
+
+    def test_withDateTimeInput_returnsTrueAndDateTime(self):
+        flag, value = try_parse_datetime(datetime(2016, 5, 31, 10, 0))
+
+        self.assertTrue(flag)
+        self.assertEqual(datetime(2016, 5, 31, 10, 0, 0), value)
+
+    def test_inputIsNumber_returnsFalseAndNumber(self):
+        flag, value = try_parse_datetime(123)
+
+        self.assertFalse(flag)
+        self.assertEqual(123, value)
+
+    def test_inputIsNumberString_returnsFalseAndString(self):
+        flag, value = try_parse_datetime("56")
+
+        self.assertFalse(flag)
+        self.assertEqual("56", value)
+
+    def test_inputIsFloatString_returnsFalseAndString(self):
+        flag, value = try_parse_datetime("3.14")
+
+        self.assertFalse(flag)
+        self.assertEqual("3.14", value)
+
+    def test_inputIsShortDateWithoutYear_returnsFalseAndString(self):
+        flag, value = try_parse_date("11-01")
+
+        self.assertFalse(flag)
+        self.assertEqual("11-01", value)
+
+    def test_inputIsTimeString_returnsCurrentDateWithGivenTime(self):
+        flag, value = try_parse_datetime(" 15:00")
+
+        self.assertFalse(flag)
+        self.assertEqual(" 15:00", value)
+
+    def test_inputFromVbvExcel_returnsCurrentDateWithGivenTime(self):
+        flag, value = try_parse_datetime("09.06.2023, 13:30")
+
+        self.assertTrue(flag)
+        self.assertEqual(datetime(2023, 6, 9, 13, 30, 0), value)
+
+
+class ParseCircleGroupStringTestCase(TestCase):
+    def test_withMultipleCircles(self):
+        value = "Fahrzeug (A, B), Reisen (A), KMU (B)"
+        self.assertEqual(
+            ["Fahrzeug (A, B)", "Reisen (A)", "KMU (B)"],
+            parse_circle_group_string(value),
+        )
diff --git a/server/vbv_lernwelt/importer/urls.py b/server/vbv_lernwelt/importer/urls.py
new file mode 100644
index 00000000..e69de29b
diff --git a/server/vbv_lernwelt/importer/utils.py b/server/vbv_lernwelt/importer/utils.py
new file mode 100644
index 00000000..d61405d2
--- /dev/null
+++ b/server/vbv_lernwelt/importer/utils.py
@@ -0,0 +1,110 @@
+import datetime
+import re
+from typing import Any, List, Optional, Tuple, Union
+
+from dateutil.parser import parse
+from six import string_types
+
+
+def parse_formats(dt_str, fmt_strs, **parser_kwargs):
+    for fmt in fmt_strs:
+        try:
+            return datetime.datetime.strptime(dt_str, fmt)
+        except ValueError:
+            pass
+
+    return parse(dt_str, **parser_kwargs)
+
+
+def try_parse_int(x: Any, default: Optional[Any] = None) -> Tuple[bool, Any]:
+    try:
+        return True, int(x)
+    # pylint: disable=broad-except
+    except Exception:
+        if default is None:
+            return False, x
+        return False, default
+
+
+def try_parse_date(
+    value: Union[str, datetime.date]
+) -> Tuple[bool, Union[str, datetime.date]]:
+    if isinstance(value, datetime.date):
+        return True, value
+    elif isinstance(value, datetime.datetime):
+        return True, value.date()
+    elif isinstance(value, string_types):
+        if value.strip().replace(".", "", 1).isdigit():
+            return False, value
+
+        # date needs at least 3 parts
+        if len(re.split(r"[.-]", value)) < 3:
+            return False, value
+
+        try:
+            date_with_time = parse_formats(
+                value,
+                [
+                    "%Y-%m-%dT%H:%M:%S",
+                    "%Y-%m-%d",
+                    "%d.%m.%Y",
+                ],
+                dayfirst=True,
+            )
+            return True, date_with_time.date()
+        except ValueError:
+            return False, value
+    else:
+        return False, value
+
+
+def try_parse_datetime(
+    value: Union[str, datetime.datetime]
+) -> Tuple[bool, Union[str, datetime.datetime]]:
+    if isinstance(value, datetime.datetime):
+        return True, value
+    elif isinstance(value, string_types):
+        if value.strip().replace(".", "", 1).isdigit():
+            return False, value
+
+        # date needs at least 3 parts
+        if len(re.split(r"[.-]", value)) < 3:
+            return False, value
+
+        try:
+            date_with_time = parse_formats(
+                value,
+                [
+                    "%Y-%m-%dT%H:%M:%S",
+                    "%Y-%m-%dT%H:%M",
+                    "%Y-%m-%d %H:%M:%S",
+                    "%Y-%m-%d %H:%M",
+                    "%d.%m.%Y, %H:%M",
+                ],
+                dayfirst=True,
+            )
+            return True, date_with_time
+        except ValueError:
+            return False, value
+    else:
+        return False, value
+
+
+def parse_circle_group_string(value: str) -> List[str]:
+    # This regex pattern matches any comma that is not inside parentheses
+    pattern = r",(?![^()]*\))"
+
+    # re.split() splits the string based on the pattern
+    return [x.strip() for x in re.split(pattern, value)]
+
+
+def calc_header_tuple_list_from_pyxl_sheet(sheet):
+    header = [cell.value for cell in sheet[1]]
+
+    result = []
+    for row in sheet.iter_rows(min_row=2, values_only=True):
+        if all(cell_value is None for cell_value in row):
+            continue
+        result.append(list(zip(header, row)))
+
+    return result
diff --git a/server/vbv_lernwelt/importer/views.py b/server/vbv_lernwelt/importer/views.py
new file mode 100644
index 00000000..e69de29b
diff --git a/server/vbv_lernwelt/notify/service.py b/server/vbv_lernwelt/notify/service.py
index e14decd9..ec384814 100644
--- a/server/vbv_lernwelt/notify/service.py
+++ b/server/vbv_lernwelt/notify/service.py
@@ -1,6 +1,6 @@
-import logging
 from typing import Optional
 
+import structlog
 from notifications.signals import notify
 from sendgrid import Mail, SendGridAPIClient
 from storages.utils import setting
@@ -8,7 +8,7 @@ from storages.utils import setting
 from vbv_lernwelt.core.models import User
 from vbv_lernwelt.notify.models import Notification, NotificationType
 
-logger = logging.getLogger(__name__)
+logger = structlog.get_logger(__name__)
 
 
 class EmailService:
@@ -25,10 +25,14 @@ class EmailService:
         )
         try:
             cls._sendgrid_client.send(message)
-            logger.info(f"Successfully sent email to {recipient}")
+            logger.info(f"Successfully sent email to {recipient}", label="email")
             return True
         except Exception as e:
-            logger.error(f"Failed to send email to {recipient}: {e}")
+            logger.error(
+                f"Failed to send email to {recipient}: {e}",
+                exc_info=True,
+                label="email",
+            )
             return False
 
 
diff --git a/server/vbv_lernwelt/sso/jwt.py b/server/vbv_lernwelt/sso/jwt.py
index c31462a6..dee3c02a 100644
--- a/server/vbv_lernwelt/sso/jwt.py
+++ b/server/vbv_lernwelt/sso/jwt.py
@@ -1,8 +1,9 @@
 import base64
 import json
-import logging
 
-logger = logging.getLogger(__name__)
+import structlog
+
+logger = structlog.get_logger(__name__)
 
 
 def decode_jwt(jwt: str):
@@ -11,7 +12,9 @@ def decode_jwt(jwt: str):
         payload_bytes = base64.urlsafe_b64decode(_correct_padding(jwt_parts[1]))
         payload = json.loads(payload_bytes.decode("UTF-8"))
     except Exception as e:
-        logger.warning(f"OAuthToken error: Could not decode jwt: {e}")
+        logger.warning(
+            f"OAuthToken error: Could not decode jwt: {e}", exc_info=True, label="sso"
+        )
         return None
     return payload
 
diff --git a/server/vbv_lernwelt/sso/tests.py b/server/vbv_lernwelt/sso/tests.py
deleted file mode 100644
index 7ce503c2..00000000
--- a/server/vbv_lernwelt/sso/tests.py
+++ /dev/null
@@ -1,3 +0,0 @@
-from django.test import TestCase
-
-# Create your tests here.
diff --git a/server/vbv_lernwelt/sso/tests/sso_token.json b/server/vbv_lernwelt/sso/tests/sso_token.json
new file mode 100644
index 00000000..e9995eee
--- /dev/null
+++ b/server/vbv_lernwelt/sso/tests/sso_token.json
@@ -0,0 +1,17 @@
+{
+  "ver": "1.0",
+  "iss": "https://vbvtst.b2clogin.com/6967b19e-ec5c-4a46-bb16-01b0983da41b/v2.0/",
+  "sub": "f8c8e526-9fb1-4983-a5b7-4c069a83e317",
+  "aud": "8d32c131-0d60-4588-b01a-ae3435d44c23",
+  "exp": 1685538794,
+  "nonce": "mABq9hjYOMF34fCEi3VL",
+  "iat": 1685535194,
+  "auth_time": 1685535194,
+  "oid": "f8c8e526-9fb1-4983-a5b7-4c069a83e317",
+  "given_name": "Daniel",
+  "family_name": "Egger",
+  "name": "unknown",
+  "emails": ["daniel.egger+vbv-stage@gmail.com"],
+  "tfp": "B2C_1_SignUpAndSignIn_v3",
+  "nbf": 1685535194
+}
diff --git a/server/vbv_lernwelt/sso/views.py b/server/vbv_lernwelt/sso/views.py
index d5a4698d..98aa587e 100644
--- a/server/vbv_lernwelt/sso/views.py
+++ b/server/vbv_lernwelt/sso/views.py
@@ -1,10 +1,11 @@
 import structlog as structlog
 from authlib.integrations.base_client import OAuthError
 from django.conf import settings
-from django.contrib.auth import get_user_model, login as dj_login
+from django.contrib.auth import login as dj_login
 from django.shortcuts import redirect
 from sentry_sdk import capture_exception
 
+from vbv_lernwelt.importer.services import create_or_update_user
 from vbv_lernwelt.sso.client import oauth
 from vbv_lernwelt.sso.jwt import decode_jwt
 
@@ -22,19 +23,25 @@ def login(request):
 
 def authorize(request):
     try:
-        logger.debug(request)
+        logger.debug(request, label="sso")
         token = getattr(oauth, settings.OAUTH["client_name"]).authorize_access_token(
             request
         )
-        deocded_token = decode_jwt(token["id_token"])
+        decoded_token = decode_jwt(token["id_token"])
+        # logger.debug(label="sso", decoded_token=decoded_token)
     except OAuthError as e:
-        logger.error(f"OAuth error: {e}")
+        logger.error(e, exc_info=True, label="sso")
         if not settings.DEBUG:
             capture_exception(e)
         return redirect(f"/{OAUTH_FAIL_REDIRECT}?state=someerror")  # to be defined
 
-    user_data = _user_data_from_token_data(deocded_token)
-    user, created = get_user_model().objects.create_or_update_by_email(user_data)
+    user_data = _user_data_from_token_data(decoded_token)
+    user = create_or_update_user(
+        email=user_data.get("email"),
+        sso_id=user_data.get("sso_id"),
+        first_name=user_data.get("first_name", ""),
+        last_name=user_data.get("last_name", ""),
+    )
 
     dj_login(request, user)
     return redirect(f"/")
@@ -45,7 +52,6 @@ def _user_data_from_token_data(token: dict) -> dict:
     return {
         "first_name": token.get("given_name", ""),
         "last_name": token.get("family_name", ""),
-        "username": token.get("preferred_username", first_email),
         "email": first_email,
-        "oid": token.get("oid"),
+        "sso_id": token.get("oid"),
     }
diff --git a/server/vbv_lernwelt/static/avatars/myvbv-default-avatar.png b/server/vbv_lernwelt/static/avatars/myvbv-default-avatar.png
new file mode 100644
index 00000000..684656de
Binary files /dev/null and b/server/vbv_lernwelt/static/avatars/myvbv-default-avatar.png differ