Add user_login field and migrate existing credentials.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/apps/accounts/models.py

@@ -9,21 +9,22 @@ from django.utils import timezone
 
 
 class UserManager(BaseUserManager):
-    def create_user(self, user_name: str, password: str | None = None, **extra_fields):
-        if not user_name:
-            raise ValueError("user_name is required")
+    def create_user(self, user_login: str, password: str | None = None, **extra_fields):
+        if not user_login:
+            raise ValueError("user_login is required")
         extra_fields.setdefault("status", User.STATUS_GM)
         extra_fields.setdefault("is_superuser", False)
-        user = self.model(user_name=user_name, **extra_fields)
+        extra_fields.setdefault("user_name", user_login)
+        user = self.model(user_login=user_login, **extra_fields)
         user.set_password(password)
         user.save(using=self._db)
         return user
 
-    def create_superuser(self, user_name: str, password: str | None = None, **extra_fields):
+    def create_superuser(self, user_login: str, password: str | None = None, **extra_fields):
         """Break-glass: status=superuser (ops + user management). Hidden from user lists."""
         extra_fields["status"] = User.STATUS_SUPERUSER
         extra_fields["is_superuser"] = True
-        return self.create_user(user_name, password, **extra_fields)
+        return self.create_user(user_login, password, **extra_fields)
 
 
 class User(AbstractBaseUser, PermissionsMixin):
@@ -75,6 +76,7 @@ class User(AbstractBaseUser, PermissionsMixin):
     )
 
     user_id = models.BigAutoField(primary_key=True)
+    user_login = models.CharField(max_length=30, unique=True)
     user_name = models.CharField(max_length=30, unique=True)
     status = models.CharField(max_length=30, choices=STATUS_CHOICES, default=STATUS_GM)
     # BUH who manages this GM / GM Admin (unused for director / buh themselves).
@@ -102,8 +104,8 @@ class User(AbstractBaseUser, PermissionsMixin):
 
     objects = UserManager()
 
-    USERNAME_FIELD = "user_name"
-    REQUIRED_FIELDS: list[str] = []
+    USERNAME_FIELD = "user_login"
+    REQUIRED_FIELDS: list[str] = ["user_name"]
 
     class Meta:
         db_table = "user_access"