diff --git a/backend/time_tracking/migrations/0002_fix_user_foreign_key.py b/backend/time_tracking/migrations/0002_fix_user_foreign_key.py
index 76b585d..f0b60df 100644
--- a/backend/time_tracking/migrations/0002_fix_user_foreign_key.py
+++ b/backend/time_tracking/migrations/0002_fix_user_foreign_key.py
@@ -1,6 +1,79 @@
 from django.db import migrations
 
 
+def fix_user_foreign_key(apps, schema_editor):
+    with schema_editor.connection.cursor() as cursor:
+        # Récupère le vrai nom de la FK actuellement présente
+        cursor.execute("""
+            SELECT CONSTRAINT_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 = 'auth_user'
+              AND REFERENCED_COLUMN_NAME = 'id'
+        """)
+
+        row = cursor.fetchone()
+
+        if not row:
+            # La FK vers auth_user n'existe déjà plus.
+            # On vérifie simplement si la bonne FK existe.
+            cursor.execute("""
+                SELECT CONSTRAINT_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 = 'users_user'
+                  AND REFERENCED_COLUMN_NAME = 'id'
+            """)
+
+            if cursor.fetchone():
+                return
+
+            raise RuntimeError(
+                "Impossible de trouver la FK de time_tracking_timeentry.user_id"
+            )
+
+        old_constraint = row[0]
+
+        # Supprime la FK actuelle
+        cursor.execute(
+            f"""
+            ALTER TABLE time_tracking_timeentry
+            DROP FOREIGN KEY `{old_constraint}`
+            """
+        )
+
+        # Crée la FK correcte vers users_user
+        cursor.execute("""
+            ALTER TABLE time_tracking_timeentry
+            ADD CONSTRAINT time_tracking_timeentry_user_id_users_user_fk
+            FOREIGN KEY (user_id)
+            REFERENCES users_user (id)
+            ON DELETE CASCADE
+        """)
+
+
+def reverse_user_foreign_key(apps, schema_editor):
+    with schema_editor.connection.cursor() as cursor:
+        # Supprime la FK users_user
+        cursor.execute("""
+            ALTER TABLE time_tracking_timeentry
+            DROP FOREIGN KEY time_tracking_timeentry_user_id_users_user_fk
+        """)
+
+        # Recrée la FK vers auth_user
+        cursor.execute("""
+            ALTER TABLE time_tracking_timeentry
+            ADD CONSTRAINT time_tracking_timeentry_user_id_auth_user_fk
+            FOREIGN KEY (user_id)
+            REFERENCES auth_user (id)
+            ON DELETE CASCADE
+        """)
+
+
 class Migration(migrations.Migration):
 
     dependencies = [
@@ -8,32 +81,8 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        migrations.RunSQL(
-            sql=[
-                """
-                ALTER TABLE time_tracking_timeentry
-                DROP FOREIGN KEY time_tracking_timeentry_user_id_59aa2b1f_fk_auth_user_id;
-                """,
-                """
-                ALTER TABLE time_tracking_timeentry
-                ADD CONSTRAINT time_tracking_timeentry_user_id_users_user_fk
-                FOREIGN KEY (user_id)
-                REFERENCES users_user (id)
-                ON DELETE CASCADE;
-                """,
-            ],
-            reverse_sql=[
-                """
-                ALTER TABLE time_tracking_timeentry
-                DROP FOREIGN KEY time_tracking_timeentry_user_id_users_user_fk;
-                """,
-                """
-                ALTER TABLE time_tracking_timeentry
-                ADD CONSTRAINT time_tracking_timeentry_user_id_59aa2b1f_fk_auth_user_id
-                FOREIGN KEY (user_id)
-                REFERENCES auth_user (id)
-                ON DELETE CASCADE;
-                """,
-            ],
+        migrations.RunPython(
+            fix_user_foreign_key,
+            reverse_user_foreign_key,
         ),
     ]
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