Вроде пофиксил всё

app/routes/user_routes.py

@@ -4,6 +4,7 @@ from app.services.db_manager import DatabaseManager
 from sqlalchemy.exc import SQLAlchemyError
 from instance.configdb import get_database_manager
 from pydantic import BaseModel
+from typing import Optional
 from uuid import UUID
 import logging
 
@@ -15,13 +16,14 @@ router = APIRouter()
 # Модели запросов и ответов
 class CreateUserRequest(BaseModel):
     telegram_id: str
-    referrer_id: str
+    referrer_id: Optional[str] = None
 
 class UserResponse(BaseModel):
     id: UUID
     telegram_id: str
-    username: str
+    username: Optional[str]
     balance: float
+    referrer_id: Optional[str]
     created_at: str
     updated_at: str
 
@@ -44,7 +46,7 @@ async def create_user(
             telegram_id=user.telegram_id,
             username=user.username,
             balance=user.balance,
-            referrer_id = user.referrer_id,
+            referrer_id=user.referrer_id if user.referrer_id is not None else None,
             created_at=user.created_at.isoformat(),
             updated_at=user.updated_at.isoformat()
         )
@@ -70,11 +72,12 @@ async def get_user(
 
         logger.info(f"Пользователь найден: ID={user.id}, Username={user.username}")
 
-        user_response = UserResponse(
+        return UserResponse(
             id=user.id,
             telegram_id=user.telegram_id,
             username=user.username,
             balance=user.balance,
+            referrer_id=user.referrer_id if user.referrer_id is not None else None,
             created_at=user.created_at.isoformat(),
             updated_at=user.updated_at.isoformat()
         )