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diff --git a/accounts/__pycache__/signals.cpython-313.pyc b/accounts/__pycache__/signals.cpython-313.pyc
new file mode 100644
index 0000000..7f8e323
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diff --git a/accounts/__pycache__/urls.cpython-313.pyc b/accounts/__pycache__/urls.cpython-313.pyc
index c024d90..be27102 100644
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diff --git a/accounts/__pycache__/views.cpython-313.pyc b/accounts/__pycache__/views.cpython-313.pyc
index fc7da10..ee2fd6a 100644
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diff --git a/accounts/admin.py b/accounts/admin.py
index 8c38f3f..9d87a67 100644
--- a/accounts/admin.py
+++ b/accounts/admin.py
@@ -1,3 +1,13 @@
 from django.contrib import admin
+from django.contrib.auth.admin import UserAdmin
+from .models import CustomUser, AbsencePeriod
 
-# Register your models here.
+class CustomUserAdmin(UserAdmin):
+    model = CustomUser
+    list_display = ['email', 'username', 'team', 'is_staff']
+    fieldsets = UserAdmin.fieldsets + (
+        (None, {'fields': ('team',)}),
+    )
+
+admin.site.register(CustomUser, CustomUserAdmin)
+admin.site.register(AbsencePeriod)
\ No newline at end of file
diff --git a/accounts/apps.py b/accounts/apps.py
index 3e3c765..4f3f51c 100644
--- a/accounts/apps.py
+++ b/accounts/apps.py
@@ -1,6 +1,8 @@
 from django.apps import AppConfig
 
-
 class AccountsConfig(AppConfig):
     default_auto_field = 'django.db.models.BigAutoField'
     name = 'accounts'
+
+    def ready(self):
+        import accounts.signals
\ No newline at end of file
diff --git a/accounts/forms.py b/accounts/forms.py
index d7ab0e9..6fe6bb7 100644
--- a/accounts/forms.py
+++ b/accounts/forms.py
@@ -26,3 +26,12 @@ class CustomUserChangeForm(forms.ModelForm):
     class Meta:
         model = CustomUser
         fields = ('username', 'first_name', 'last_name', 'email', 'birth_date', 'player_number', 'team')
+
+class PlayerCreationForm(forms.ModelForm):
+    parent1_email = forms.EmailField(required=False)
+    parent2_email = forms.EmailField(required=False)
+    birth_date = forms.DateField(input_formats=['%d.%m.%Y'], widget=forms.DateInput(format='%d.%m.%Y'))
+
+    class Meta:
+        model = CustomUser
+        fields = ('username', 'first_name', 'last_name', 'email', 'birth_date', 'player_number', 'team')
diff --git a/accounts/migrations/0003_absenceperiod.py b/accounts/migrations/0003_absenceperiod.py
new file mode 100644
index 0000000..350dabe
--- /dev/null
+++ b/accounts/migrations/0003_absenceperiod.py
@@ -0,0 +1,24 @@
+# Generated by Django 5.2.6 on 2025-10-01 07:05
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('accounts', '0002_customuser_team'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='AbsencePeriod',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('start_date', models.DateField()),
+                ('end_date', models.DateField()),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='absence_periods', to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+    ]
diff --git a/accounts/migrations/__pycache__/0003_absenceperiod.cpython-313.pyc b/accounts/migrations/__pycache__/0003_absenceperiod.cpython-313.pyc
new file mode 100644
index 0000000..be680c5
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diff --git a/accounts/models.py b/accounts/models.py
index 4d87b3a..fad17c1 100644
--- a/accounts/models.py
+++ b/accounts/models.py
@@ -30,4 +30,9 @@ class InvitationCode(models.Model):
         return True
 
     def __str__(self):
-        return self.code
\ No newline at end of file
+        return self.code
+
+class AbsencePeriod(models.Model):
+    user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name='absence_periods')
+    start_date = models.DateField()
+    end_date = models.DateField()
\ No newline at end of file
diff --git a/accounts/signals.py b/accounts/signals.py
new file mode 100644
index 0000000..5e9dcc6
--- /dev/null
+++ b/accounts/signals.py
@@ -0,0 +1,19 @@
+from django.db.models.signals import post_save
+from django.dispatch import receiver
+from .models import AbsencePeriod
+from calendars.models import Event, EventParticipation
+
+@receiver(post_save, sender=AbsencePeriod)
+def handle_absence_period(sender, instance, **kwargs):
+    user = instance.user
+    events_in_period = Event.objects.filter(
+        team=user.team,
+        start_time__date__gte=instance.start_date,
+        start_time__date__lte=instance.end_date
+    )
+    for event in events_in_period:
+        EventParticipation.objects.update_or_create(
+            user=user,
+            event=event,
+            defaults={'status': 'rejected'}
+        )
diff --git a/accounts/templates/accounts/logout.html b/accounts/templates/accounts/logout.html
new file mode 100644
index 0000000..099733f
--- /dev/null
+++ b/accounts/templates/accounts/logout.html
@@ -0,0 +1,10 @@
+{% extends "base.html" %}
+
+{% block content %}
+  <h2>Logout</h2>
+  <p>Are you sure you want to log out?</p>
+  <form method="post" action="{% url 'logout' %}">
+    {% csrf_token %}
+    <button type="submit">Log Out</button>
+  </form>
+{% endblock %}
diff --git a/accounts/templates/accounts/player_form.html b/accounts/templates/accounts/player_form.html
new file mode 100644
index 0000000..51c8100
--- /dev/null
+++ b/accounts/templates/accounts/player_form.html
@@ -0,0 +1,10 @@
+{% extends "base.html" %}
+
+{% block content %}
+  <h2>Create Player</h2>
+  <form method="post">
+    {% csrf_token %}
+    {{ form.as_p }}
+    <button type="submit">Create Player</button>
+  </form>
+{% endblock %}
diff --git a/accounts/templates/base.html b/accounts/templates/base.html
index 1e9ad1c..8d355b4 100644
--- a/accounts/templates/base.html
+++ b/accounts/templates/base.html
@@ -4,7 +4,14 @@
     <title>Baseball Organisator</title>
 </head>
 <body>
+    {% if user.is_authenticated %}
+        <form method="post" action="{% url 'logout' %}">
+            {% csrf_token %}
+            <button type="submit">Log Out</button>
+        </form>
+    {% endif %}
+
     {% block content %}
     {% endblock %}
 </body>
-</html>
+</html>
\ No newline at end of file
diff --git a/accounts/urls.py b/accounts/urls.py
index ab96f4f..2d0f7c6 100644
--- a/accounts/urls.py
+++ b/accounts/urls.py
@@ -5,7 +5,8 @@ from django.contrib.auth import views as auth_views
 urlpatterns = [
     path('invitation/', views.invitation_code_view, name='invitation_code'),
     path('register/', views.register_view, name='register'),
-    path('login/', auth_views.LoginView.as_view(template_name='accounts/login.html'), name='login'),
+    path('login/', views.MyLoginView.as_view(template_name='accounts/login.html'), name='login'),
     path('logout/', auth_views.LogoutView.as_view(), name='logout'),
     path('profile/', views.edit_profile, name='edit_profile'),
+    path('player/add/', views.PlayerCreateView.as_view(), name='player-add'),
 ]
\ No newline at end of file
diff --git a/accounts/views.py b/accounts/views.py
index b15b898..d407eaf 100644
--- a/accounts/views.py
+++ b/accounts/views.py
@@ -1,7 +1,12 @@
 from django.shortcuts import render, redirect
-from .forms import InvitationCodeForm, CustomUserCreationForm, CustomUserChangeForm
-from .models import InvitationCode
+from django.urls import reverse_lazy
+from django.views.generic.edit import CreateView
 from django.contrib.auth.decorators import login_required
+from django.contrib.auth.mixins import LoginRequiredMixin, UserPassesTestMixin
+from django.contrib.auth import views as auth_views
+from .forms import InvitationCodeForm, CustomUserCreationForm, CustomUserChangeForm, PlayerCreationForm
+from .models import CustomUser, InvitationCode
+import uuid
 
 def invitation_code_view(request):
     if request.method == 'POST':
@@ -52,4 +57,40 @@ def edit_profile(request):
             return redirect('edit_profile') # Or wherever you want to redirect
     else:
         form = CustomUserChangeForm(instance=request.user)
-    return render(request, 'accounts/edit_profile.html', {'form': form})
\ No newline at end of file
+    return render(request, 'accounts/edit_profile.html', {'form': form})
+
+class HeadCoachCheckMixin(UserPassesTestMixin):
+    def test_func(self):
+        return self.request.user.is_superuser or self.request.user.coached_teams.exists()
+
+class PlayerCreateView(LoginRequiredMixin, HeadCoachCheckMixin, CreateView):
+    model = CustomUser
+    form_class = PlayerCreationForm
+    template_name = 'accounts/player_form.html'
+    success_url = reverse_lazy('dashboard')
+
+    def form_valid(self, form):
+        # Create player user
+        player = form.save(commit=False)
+        player.is_active = False # Player can only login after using invitation code
+        player.save()
+
+        # Create invitation code for player
+        InvitationCode.objects.create(code=str(uuid.uuid4()), user=player)
+
+        # Create parent users and invitation codes
+        for email_field in ['parent1_email', 'parent2_email']:
+            email = form.cleaned_data.get(email_field)
+            if email:
+                parent_user = CustomUser.objects.filter(email=email).first()
+                if not parent_user:
+                    parent_user = CustomUser.objects.create(email=email, username=email, is_active=False)
+                InvitationCode.objects.create(code=str(uuid.uuid4()), user=parent_user)
+
+        return redirect(self.success_url)
+
+class MyLoginView(auth_views.LoginView):
+    def get(self, request, *args, **kwargs):
+        if request.user.is_authenticated:
+            return redirect('dashboard')
+        return super().get(request, *args, **kwargs)
\ No newline at end of file
diff --git a/baseball_organisator/__pycache__/admin.cpython-313.pyc b/baseball_organisator/__pycache__/admin.cpython-313.pyc
new file mode 100644
index 0000000..7ec8702
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diff --git a/baseball_organisator/__pycache__/urls.cpython-313.pyc b/baseball_organisator/__pycache__/urls.cpython-313.pyc
index 6603856..8149b53 100644
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diff --git a/baseball_organisator/admin.py b/baseball_organisator/admin.py
new file mode 100644
index 0000000..d962bb2
--- /dev/null
+++ b/baseball_organisator/admin.py
@@ -0,0 +1,11 @@
+from django.contrib import admin
+
+def has_permission(self, request):
+    if request.user.is_active and request.user.is_staff:
+        if request.user.is_superuser:
+            return True
+        if hasattr(request.user, 'administered_clubs') and request.user.administered_clubs.exists():
+            return True
+    return False
+
+admin.site.has_permission = has_permission.__get__(admin.site, admin.AdminSite)
diff --git a/baseball_organisator/urls.py b/baseball_organisator/urls.py
index 0119cc1..5a06906 100644
--- a/baseball_organisator/urls.py
+++ b/baseball_organisator/urls.py
@@ -16,6 +16,7 @@ Including another URLconf
 """
 from django.contrib import admin
 from django.urls import path, include
+import baseball_organisator.admin
 
 urlpatterns = [
     path('admin/', admin.site.urls),
diff --git a/calendars/__pycache__/admin.cpython-313.pyc b/calendars/__pycache__/admin.cpython-313.pyc
index 5169540..04fda17 100644
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diff --git a/calendars/__pycache__/models.cpython-313.pyc b/calendars/__pycache__/models.cpython-313.pyc
index 895e3a3..0e5eafd 100644
Binary files a/calendars/__pycache__/models.cpython-313.pyc and b/calendars/__pycache__/models.cpython-313.pyc differ
diff --git a/calendars/admin.py b/calendars/admin.py
index b997dd9..8764abb 100644
--- a/calendars/admin.py
+++ b/calendars/admin.py
@@ -1,7 +1,8 @@
 from django.contrib import admin
-from .models import Event, Training, Game, GameResult
+from .models import Event, Training, Game, GameResult, EventParticipation
 
 admin.site.register(Event)
 admin.site.register(Training)
 admin.site.register(Game)
-admin.site.register(GameResult)
\ No newline at end of file
+admin.site.register(GameResult)
+admin.site.register(EventParticipation)
diff --git a/calendars/migrations/0002_eventparticipation.py b/calendars/migrations/0002_eventparticipation.py
new file mode 100644
index 0000000..01a53e3
--- /dev/null
+++ b/calendars/migrations/0002_eventparticipation.py
@@ -0,0 +1,28 @@
+# Generated by Django 5.2.6 on 2025-10-01 07:05
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('calendars', '0001_initial'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='EventParticipation',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('status', models.CharField(choices=[('attending', 'Attending'), ('rejected', 'Rejected'), ('maybe', 'Maybe')], default='maybe', max_length=20)),
+                ('event', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='calendars.event')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                'unique_together': {('user', 'event')},
+            },
+        ),
+    ]
diff --git a/calendars/migrations/__pycache__/0002_eventparticipation.cpython-313.pyc b/calendars/migrations/__pycache__/0002_eventparticipation.cpython-313.pyc
new file mode 100644
index 0000000..13be1ef
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diff --git a/calendars/models.py b/calendars/models.py
index 29228dd..5ec7b39 100644
--- a/calendars/models.py
+++ b/calendars/models.py
@@ -34,4 +34,12 @@ class GameResult(models.Model):
     inning_results = models.CharField(max_length=255, help_text="Comma-separated scores per inning, e.g., '1-0,0-2,3-1'")
 
     def __str__(self):
-        return f"Result for {self.game}"
\ No newline at end of file
+        return f"Result for {self.game}"
+
+class EventParticipation(models.Model):
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
+    event = models.ForeignKey(Event, on_delete=models.CASCADE)
+    status = models.CharField(max_length=20, choices=[('attending', 'Attending'), ('rejected', 'Rejected'), ('maybe', 'Maybe')], default='maybe')
+
+    class Meta:
+        unique_together = ('user', 'event')
\ No newline at end of file
diff --git a/db.sqlite3 b/db.sqlite3
index 57f3111..f70bebe 100644
Binary files a/db.sqlite3 and b/db.sqlite3 differ
diff --git a/docs/phase5.md b/docs/phase5.md
new file mode 100644
index 0000000..5b4c8c2
--- /dev/null
+++ b/docs/phase5.md
@@ -0,0 +1,29 @@
+## Phase 5: Fortgeschrittene Funktionen und Backend
+
+Diese Phase umfasst komplexere Features wie die Spieleranlage, die Abwesenheitsfunktion und das Backend-Management.
+
+    Schritt 1: Spieleranlage-Workflow
+
+        Implementiere in den accounts-Views einen Workflow für Headcoaches, um neue Spieler anzulegen.
+
+        Die Logik muss die automatische Generierung von Einladungscodes für den Spieler und optional für bis zu zwei Elternteile umfassen.
+
+        Die Überprüfung des Alters und die automatische Zuweisung eines Standard-Geburtsdatums muss implementiert werden.
+
+    Schritt 2: Abwesenheitsfunktion implementieren
+
+        Erstelle in accounts/models.py ein Modell AbsencePeriod mit Feldern start_date, end_date und einer Verknüpfung zum User.
+
+        Implementiere in den Views die Logik, die alle Termine in diesem Zeitraum automatisch auf "abgelehnt" setzt.
+
+    Schritt 3: Django-Admin-Bereich anpassen
+
+        Konfiguriere den Django-Admin-Bereich, sodass nur Club-Admins und der Superuser darauf zugreifen können.
+
+        Registriere die erstellten Modelle im Admin-Bereich, um die Verwaltung zu erleichtern.
+
+    Schritt 4: User-Migration und Logik für Rollen-Änderungen
+
+        Schreibe die Migrationsdateien für alle erstellten Modelle.
+
+        Implementiere die Logik für den Wechsel der Rollen, z. B. wenn ein Spieler über 18 Jahre alt wird.
diff --git a/docs/traceback/trace2.log b/docs/traceback/trace2.log
new file mode 100644
index 0000000..1d56c3e
--- /dev/null
+++ b/docs/traceback/trace2.log
@@ -0,0 +1,70 @@
+Exception in thread django-main-thread:
+Traceback (most recent call last):
+  File "/usr/lib64/python3.13/threading.py", line 1043, in _bootstrap_inner
+    self.run()
+    ~~~~~~~~^^
+  File "/usr/lib64/python3.13/threading.py", line 994, in run
+    self._target(*self._args, **self._kwargs)
+    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/utils/autoreload.py", line 64, in wrapper
+    fn(*args, **kwargs)
+    ~~^^^^^^^^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/core/management/commands/runserver.py", line 134, in inner_run
+    self.check(**check_kwargs)
+    ~~~~~~~~~~^^^^^^^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/core/management/base.py", line 492, in check
+    all_issues = checks.run_checks(
+        app_configs=app_configs,
+    ...<2 lines>...
+        databases=databases,
+    )
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/core/checks/registry.py", line 89, in run_checks
+    new_errors = check(app_configs=app_configs, databases=databases)
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/core/checks/urls.py", line 16, in check_url_config
+    return check_resolver(resolver)
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/core/checks/urls.py", line 26, in check_resolver
+    return check_method()
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/urls/resolvers.py", line 531, in check
+    for pattern in self.url_patterns:
+                   ^^^^^^^^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/utils/functional.py", line 47, in __get__
+    res = instance.__dict__[self.name] = self.func(instance)
+                                         ~~~~~~~~~^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/urls/resolvers.py", line 718, in url_patterns
+    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
+                       ^^^^^^^^^^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/utils/functional.py", line 47, in __get__
+    res = instance.__dict__[self.name] = self.func(instance)
+                                         ~~~~~~~~~^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/urls/resolvers.py", line 711, in urlconf_module
+    return import_module(self.urlconf_name)
+  File "/usr/lib64/python3.13/importlib/__init__.py", line 88, in import_module
+    return _bootstrap._gcd_import(name[level:], package, level)
+           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
+  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
+  File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
+  File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
+  File "<frozen importlib._bootstrap_external>", line 1026, in exec_module
+  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
+  File "/home/mnagel/Projekte/baseball_organisator/baseball_organisator/urls.py", line 23, in <module>
+    path('accounts/', include('accounts.urls')),
+                      ~~~~~~~^^^^^^^^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/urls/conf.py", line 39, in include
+    urlconf_module = import_module(urlconf_module)
+  File "/usr/lib64/python3.13/importlib/__init__.py", line 88, in import_module
+    return _bootstrap._gcd_import(name[level:], package, level)
+           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
+  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
+  File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
+  File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
+  File "<frozen importlib._bootstrap_external>", line 1026, in exec_module
+  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
+  File "/home/mnagel/Projekte/baseball_organisator/accounts/urls.py", line 2, in <module>
+    from . import views
+  File "/home/mnagel/Projekte/baseball_organisator/accounts/views.py", line 2, in <module>
+    class MyLoginView(auth_views.LoginView):
+                      ^^^^^^^^^^
+NameError: name 'auth_views' is not defined
+
diff --git a/docs/traceback/trace3.log b/docs/traceback/trace3.log
new file mode 100644
index 0000000..25b9c6a
--- /dev/null
+++ b/docs/traceback/trace3.log
@@ -0,0 +1,47 @@
+[01/Oct/2025 07:16:54] "GET / HTTP/1.1" 302 0
+[01/Oct/2025 07:17:22] "GET / HTTP/1.1" 200 540
+[01/Oct/2025 07:17:27] "POST /accounts/logout/ HTTP/1.1" 200 3420
+[01/Oct/2025 07:17:31] "GET / HTTP/1.1" 302 0
+[01/Oct/2025 07:17:31] "GET /accounts/login/?next=/ HTTP/1.1" 200 727
+[01/Oct/2025 07:17:37] "POST /accounts/login/?next=/ HTTP/1.1" 302 0
+[01/Oct/2025 07:17:37] "GET / HTTP/1.1" 200 540
+[01/Oct/2025 07:17:49] "GET /accounts/player/add/ HTTP/1.1" 200 2330
+Internal Server Error: /accounts/player/add/
+Traceback (most recent call last):
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/core/handlers/exception.py", line 55, in inner
+    response = get_response(request)
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/core/handlers/base.py", line 197, in _get_response
+    response = wrapped_callback(request, *callback_args, **callback_kwargs)
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/views/generic/base.py", line 105, in view
+    return self.dispatch(request, *args, **kwargs)
+           ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/contrib/auth/mixins.py", line 73, in dispatch
+    return super().dispatch(request, *args, **kwargs)
+           ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/contrib/auth/mixins.py", line 135, in dispatch
+    return super().dispatch(request, *args, **kwargs)
+           ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/views/generic/base.py", line 144, in dispatch
+    return handler(request, *args, **kwargs)
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/views/generic/edit.py", line 182, in post
+    return super().post(request, *args, **kwargs)
+           ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/views/generic/edit.py", line 151, in post
+    return self.form_valid(form)
+           ~~~~~~~~~~~~~~~^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/accounts/views.py", line 85, in form_valid
+    parent_user, created = CustomUser.objects.get_or_create(email=email, defaults={'username': email, 'is_active': False})
+                           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/db/models/manager.py", line 87, in manager_method
+    return getattr(self.get_queryset(), name)(*args, **kwargs)
+           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/db/models/query.py", line 946, in get_or_create
+    return self.get(**kwargs), False
+           ~~~~~~~~^^^^^^^^^^
+  File "/home/mnagel/Projekte/baseball_organisator/venv/lib64/python3.13/site-packages/django/db/models/query.py", line 636, in get
+    raise self.model.MultipleObjectsReturned(
+    ...<5 lines>...
+    )
+accounts.models.CustomUser.MultipleObjectsReturned: get() returned more than one CustomUser -- it returned 2!
+[01/Oct/2025 07:18:48] "POST /accounts/player/add/ HTTP/1.1" 500 112859
+