diff --git a/backend/time_tracking/models.py b/backend/time_tracking/models.py
index 514d1e2..577150e 100644
--- a/backend/time_tracking/models.py
+++ b/backend/time_tracking/models.py
@@ -1,9 +1,9 @@
 from django.db import models
-from django.contrib.auth import get_user_model
+from django.conf import settings
 from datetime import datetime
 
 class TimeEntry(models.Model):
-    user = models.ForeignKey(get_user_model(), on_delete=models.CASCADE, related_name='time_entries')
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name='time_entries')
     date = models.DateField()
     start_time = models.TimeField(null=True, blank=True)
     end_time = models.TimeField(null=True, blank=True)
diff --git a/backend/time_tracking/serializers.py b/backend/time_tracking/serializers.py
index 0394b67..7550a50 100644
--- a/backend/time_tracking/serializers.py
+++ b/backend/time_tracking/serializers.py
@@ -1,15 +1,12 @@
 from rest_framework import serializers
-from django.contrib.auth import get_user_model
+from django.conf import settings
 
 from .models import TimeEntry
 
 
-User = get_user_model()
-
-
 class UserSerializer(serializers.ModelSerializer):
     class Meta:
-        model = User
+        model = settings.AUTH_USER_MODEL
         fields = ['id', 'username', 'first_name', 'last_name']
 
 
@@ -50,7 +47,7 @@ class TimeEntrySerializer(serializers.ModelSerializer):
 class TimeEntryCreateSerializer(serializers.ModelSerializer):
     user_id = serializers.PrimaryKeyRelatedField(
         source='user',
-        queryset=User.objects.all(),
+        queryset=settings.AUTH_USER_MODEL.objects.all(),
         write_only=True,
         required=False,
     )
diff --git a/backend/time_tracking/urls.py b/backend/time_tracking/urls.py
index 83e7ac4..930310a 100644
--- a/backend/time_tracking/urls.py
+++ b/backend/time_tracking/urls.py
@@ -6,6 +6,7 @@ from .views import (
     TimeEntryDetailView,
     TimeEntryUpdateView,
     WeeklySummaryView,
+    DebugDatabaseView
 )
 
 urlpatterns = [
@@ -16,4 +17,5 @@ urlpatterns = [
     path('entries/<int:entry_id>/update/', TimeEntryUpdateView.as_view(), name='time-entry-update'),
     path('weekly-summary/', WeeklySummaryView.as_view(), name='user-weekly-summary'),
     path('weekly-summary/<int:user_id>/', WeeklySummaryView.as_view(), name='weekly-summary'),
+    path('debug-database/', DebugDatabaseView.as_view()),
 ]
\ No newline at end of file
diff --git a/backend/time_tracking/views.py b/backend/time_tracking/views.py
index e4fec6c..3c6cb65 100644
--- a/backend/time_tracking/views.py
+++ b/backend/time_tracking/views.py
@@ -2,8 +2,8 @@ from rest_framework import generics, status
 from rest_framework.response import Response
 from rest_framework.permissions import IsAuthenticated
 from rest_framework.views import APIView
-from django.contrib.auth import get_user_model
-from django.db import transaction
+from django.conf import settings
+from django.db import transaction, connection
 from django.utils import timezone
 from datetime import timedelta
 from datetime import time as datetime_time
@@ -16,8 +16,40 @@ from .serializers import (
     WeeklySummarySerializer
 )
 
-User = get_user_model()
+class DebugDatabaseView(APIView):
+    permission_classes = []
 
+    def get(self, request):
+        with connection.cursor() as cursor:
+            cursor.execute("""
+                SELECT
+                    CONSTRAINT_NAME,
+                    COLUMN_NAME,
+                    REFERENCED_TABLE_NAME,
+                    REFERENCED_COLUMN_NAME
+                FROM information_schema.KEY_COLUMN_USAGE
+                WHERE TABLE_SCHEMA = DATABASE()
+                  AND TABLE_NAME = 'time_tracking_timeentry'
+                  AND COLUMN_NAME = 'user_id'
+                  AND REFERENCED_TABLE_NAME IS NOT NULL
+            """)
+
+            foreign_keys = [
+                {
+                    'constraint': row[0],
+                    'column': row[1],
+                    'referenced_table': row[2],
+                    'referenced_column': row[3],
+                }
+                for row in cursor.fetchall()
+            ]
+
+        return Response({
+            'database': connection.settings_dict.get('NAME'),
+            'user_model': str(settings.AUTH_USER_MODEL),
+            'foreign_keys': foreign_keys,
+        })
+    
 class TimeEntryListView(generics.ListAPIView):
     serializer_class = TimeEntrySerializer
     permission_classes = [IsAuthenticated]
@@ -253,8 +285,8 @@ class WeeklySummaryView(APIView):
         user = request.user
         if user_id and (request.user.is_staff or request.user.is_superuser):
             try:
-                user = User.objects.get(id=user_id)
-            except User.DoesNotExist:
+                user = settings.AUTH_USER_MODEL.objects.get(id=user_id)
+            except settings.AUTH_USER_MODEL.DoesNotExist:
                 return Response({'error': 'Utilisateur non trouvé'}, status=status.HTTP_404_NOT_FOUND)
 
         serializer = WeeklySummarySerializer(build_weekly_summary(user))