diff --git a/base/static/css/main.css b/base/static/css/main.css
index e916ab0..60f2420 100644
--- a/base/static/css/main.css
+++ b/base/static/css/main.css
@@ -64,9 +64,3 @@ article.message {
         color: var(--pico-color-red-500);
     }
 }
-
-.form-error::before  {
-    margin-right: .5em;
-    font-family: remixicon;
-    content: "\eca0";
-}
diff --git a/base/templates/base/form.html b/base/templates/base/form.html
index 979daa3..df40bc7 100644
--- a/base/templates/base/form.html
+++ b/base/templates/base/form.html
@@ -1,4 +1,8 @@
-{% for error in form.non_field_errors %}<article class="message error">{{ error }}</article>{% endfor %}
+{% if form.non_field_errors %}
+    <ul class="form-errors">
+        {% for error in form.non_field_errors %}<li>{{ error }}</li>{% endfor %}
+    </ul>
+{% endif %}
 <form method="post" {% if action %}action="{% url action %}"{% endif %}>
     {% csrf_token %}
     <fieldset>
@@ -6,10 +10,12 @@
             <label>
                 {{ field.label }}
                 {{ field }}
-                {% if field.errors %}
-                    <small id="{{ field.errors.field_id }}_error" class="form-error">{{ field.errors|join:", " }}</small>
-                {% endif %}
             </label>
+            {% if field.errors %}
+                <ul class="form-errors">
+                    {% for error in field.errors %}<li>{{ error }}</li>{% endfor %}
+                </ul>
+            {% endif %}
         {% endfor %}
     </fieldset>
     <input type="submit" {% if submit %}value="{{ submit }}"{% endif %}>
diff --git a/game/migrations/0013_alter_group_unique_together_and_more.py b/game/migrations/0013_alter_group_unique_together_and_more.py
deleted file mode 100644
index 438a287..0000000
--- a/game/migrations/0013_alter_group_unique_together_and_more.py
+++ /dev/null
@@ -1,53 +0,0 @@
-# Generated by Django 5.2.3 on 2025-06-14 08:13
-
-import django.db.models.functions.text
-from django.conf import settings
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-    dependencies = [
-        ("game", "0012_alter_musikgame_playlist"),
-        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
-    ]
-
-    operations = [
-        migrations.AlterUniqueTogether(
-            name="group",
-            unique_together=set(),
-        ),
-        migrations.AlterUniqueTogether(
-            name="musicgameorder",
-            unique_together=set(),
-        ),
-        migrations.AlterUniqueTogether(
-            name="musicvideo",
-            unique_together=set(),
-        ),
-        migrations.AddConstraint(
-            model_name="group",
-            constraint=models.UniqueConstraint(
-                django.db.models.functions.text.Lower("name"),
-                models.F("owner"),
-                name="unique_group_name",
-            ),
-        ),
-        migrations.AddConstraint(
-            model_name="musicgameorder",
-            constraint=models.UniqueConstraint(
-                fields=("game", "player", "music_video"), name="unique_music_in_game"
-            ),
-        ),
-        migrations.AddConstraint(
-            model_name="musicgameorder",
-            constraint=models.UniqueConstraint(
-                fields=("game", "order"), name="unique_order"
-            ),
-        ),
-        migrations.AddConstraint(
-            model_name="musicvideo",
-            constraint=models.UniqueConstraint(
-                fields=("yt_id", "owner", "group"), name="unique_music_in_group"
-            ),
-        ),
-    ]
diff --git a/game/models.py b/game/models.py
index 886bd21..8383915 100644
--- a/game/models.py
+++ b/game/models.py
@@ -1,6 +1,5 @@
 from django.contrib.auth.models import User
 from django.db import models
-from django.db.models.functions import Lower
 from django.urls import reverse
 
 
@@ -20,9 +19,7 @@ class Group(models.Model):
         return reverse("group_detail", kwargs={"pk": self.pk})
 
     class Meta:
-        constraints = [
-            models.UniqueConstraint(Lower("name"), "owner", name="unique_group_name")
-        ]
+        unique_together = ["name", "owner"]
 
 
 class MusicVideo(models.Model):
@@ -34,11 +31,7 @@ class MusicVideo(models.Model):
     blacklisted = models.BooleanField(default=False)
 
     class Meta:
-        constraints = [
-            models.UniqueConstraint(
-                fields=("yt_id", "owner", "group"), name="unique_music_in_group"
-            )
-        ]
+        unique_together = ["yt_id", "owner", "group"]
 
 
 class MusikGame(models.Model):
@@ -59,10 +52,5 @@ class MusicGameOrder(models.Model):
     order = models.PositiveIntegerField()
 
     class Meta:
-        constraints = [
-            models.UniqueConstraint(
-                fields=("game", "player", "music_video"), name="unique_music_in_game"
-            ),
-            models.UniqueConstraint(fields=("game", "order"), name="unique_order"),
-        ]
+        unique_together = [["game", "player", "music_video"], ["game", "order"]]
         ordering = ["order"]
diff --git a/game/views.py b/game/views.py
index a24c1c6..1b188e5 100644
--- a/game/views.py
+++ b/game/views.py
@@ -4,13 +4,12 @@ import google.oauth2.credentials
 import google_auth_oauthlib
 import googleapiclient.discovery
 from django.conf import settings
-from django.contrib import messages
 from django.contrib.auth.mixins import LoginRequiredMixin
 from django.contrib.auth.models import User
 from django.contrib.messages.views import SuccessMessageMixin
-from django.db import IntegrityError
 from django.db.models import Count, Q
-from django.shortcuts import redirect
+from django.http import JsonResponse
+from django.shortcuts import get_object_or_404, redirect
 from django.views import View
 from django.views.generic.detail import DetailView, SingleObjectMixin
 from django.views.generic.edit import CreateView, DeleteView, UpdateView
@@ -38,22 +37,13 @@ class GroupMixin:
     fields = ["name"]
 
 
-class GroupIntegrityMixin:
-    def form_valid(self, form):
-        try:
-            return super().form_valid(form)
-        except IntegrityError:
-            form.add_error("name", "Ce nom de groupe existe déjà.")
-            return super().form_invalid(form)
-
-
-class GroupCreateView(LoginRequiredMixin, GroupMixin, GroupIntegrityMixin, CreateView):
+class GroupCreateView(LoginRequiredMixin, GroupMixin, CreateView):
     def form_valid(self, form):
         form.instance.owner = self.request.user
         return super().form_valid(form)
 
 
-class GroupUpdateView(OwnerFilterMixin, GroupMixin, GroupIntegrityMixin, UpdateView):
+class GroupUpdateView(OwnerFilterMixin, GroupMixin, UpdateView):
     pass
 
 
@@ -89,26 +79,14 @@ class GroupAddMusicView(MemberFilterMixin, SingleObjectMixin, View):
         group = self.get_object()
         yt_id = request.POST.get("yt_id")
         if not yt_id:
-            messages.add_message(request, messages.ERROR, "Aucun identifiant donné")
-            return redirect(group)
+            return JsonResponse({"error": "You must provide a YouTube ID."}, status=400)
         yt_id = utils.parse_musik(yt_id)
 
         title = utils.get_yt_title(yt_id)
         if not title:
-            messages.add_message(
-                request, messages.ERROR, f"Vidéo Youtube invalide : {yt_id}"
-            )
-            return redirect(group)
-        try:
-            group.musicvideo_set.create(yt_id=yt_id, title=title, owner=request.user)
-        except IntegrityError:
-            messages.add_message(
-                request, messages.ERROR, f"Vidéo Youtube déjà ajoutée : {yt_id}"
-            )
-
-        messages.add_message(
-            request, messages.SUCCESS, f"Vidéo Youtube ajoutée : {yt_id}"
-        )
+            return JsonResponse({"error": "Invalid YouTube ID."}, status=400)
+        group.musicvideo_set.create(yt_id=yt_id, title=title, owner=request.user)
+        group.save()
         return redirect(group)
 
 
@@ -119,15 +97,6 @@ class GroupAddMemberView(OwnerFilterMixin, SingleObjectMixin, View):
         group = self.get_object()
         username = request.POST.get("username")
         user = User.objects.get(username=username)
-        if user == group.owner:
-            messages.add_message(
-                request, messages.WARNING, f"{user} est le propriétaire du groupe."
-            )
-            return redirect(group)
-        if user in group.members.all():
-            messages.add_message(
-                request, messages.WARNING, f"{user} est déjà membre du groupe."
-            )
 
         group.members.add(user)
         return redirect(group)
@@ -143,25 +112,17 @@ class GroupRemoveMusicView(OwnerFilterMixin, SingleObjectMixin, View):
         return redirect(group)
 
 
-class GroupRemoveMemberView(OwnerFilterMixin, SingleObjectMixin, View):
-    model = models.Group
-
+class GroupRemoveMemberView(View):
     def get(self, request, pk, user_pk):
-        group = self.get_object()
-        user = User.objects.get(pk=user_pk)
-
-        relation = models.Group.members.through.objects.filter(
-            group=group, user=user
-        ).first()
-        if not relation:
-            messages.add_message(
-                request,
-                messages.ERROR,
-                f"L'utilisateur {user} n'est pas membre du groupe.",
-            )
-        else:
-            relation.delete()
+        relation = get_object_or_404(
+            models.Group.members.through,
+            group_id=pk,
+            user_id=user_pk,
+            group__owner=request.user,
+        )
 
+        group = relation.group
+        relation.delete()
         return redirect(group)
 
 
@@ -176,11 +137,6 @@ class GroupRemoveGameView(SingleObjectMixin, SuccessMessageMixin, View):
         game = self.get_object()
         group = game.group
         game.delete()
-        messages.add_message(
-            request,
-            messages.SUCCESS,
-            f"Le jeu du {game.date.strftime('%x')} a été supprimé avec succès.",
-        )
         return redirect(group)
 
 
@@ -294,11 +250,9 @@ class YoutubeLoginView(LoginRequiredMixin, View):
 
 class YoutubeCallbackView(LoginRequiredMixin, View):
     def get(self, request):
-        if err := request.GET.get("error"):
-            messages.add_message(
-                request, messages.ERROR, f"Échec de la connexion à Youtube : {err}"
-            )
+        if request.GET.get("error"):
             return redirect("/")
+        print(request.GET)
 
         state = self.request.session.get("state")
         flow = google_auth_oauthlib.flow.Flow.from_client_secrets_file(
@@ -324,8 +278,6 @@ class YoutubeCallbackView(LoginRequiredMixin, View):
                 }
             },
         )
-
-        messages.add_message(request, messages.SUCCESS, "Connexion à Youtube réussie.")
         return redirect("/")
 
 
@@ -335,5 +287,4 @@ class GroupClearBlacklistView(OwnerFilterMixin, SingleObjectMixin, View):
     def get(self, request, pk):
         group = self.get_object()
         group.musicvideo_set.filter(blacklisted=True).update(blacklisted=False)
-        messages.add_message(request, messages.SUCCESS, "La blacklist a été vidée.")
         return redirect(group)