diff --git a/lacommunaute/users/migrations/0004_run_management.py b/lacommunaute/users/migrations/0004_run_management.py
new file mode 100644
index 000000000..c0d096bf9
--- /dev/null
+++ b/lacommunaute/users/migrations/0004_run_management.py
@@ -0,0 +1,25 @@
+# Generated by Django 5.0.9 on 2024-11-25 15:15
+
+from django.db import migrations
+from django.db.models import F
+
+from lacommunaute.users.models import User
+
+
+def cleanup_email_in_username(apps, schema_editor):
+    users_to_migrate = User.objects.filter(username=F("email"))
+
+    while batch_users := users_to_migrate[:100]:
+        for user in batch_users:
+            user.username = User.objects.generate_unique_username()
+        User.objects.bulk_update(batch_users, ["username"])
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("users", "0003_alter_user_identity_provider"),
+    ]
+
+    operations = [
+        migrations.RunPython(cleanup_email_in_username),
+    ]