clean imports (delete imports, which are not used)

back/db.py

@@ -1,13 +1,10 @@
 from typing import AsyncGenerator
 
-from sqlalchemy import create_engine, select, MetaData
+from sqlalchemy import create_engine, MetaData
 # from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
-from sqlalchemy.orm import sessionmaker, Session, DeclarativeBase
+from sqlalchemy.orm import sessionmaker, DeclarativeBase
 from sqlalchemy.ext.declarative import declarative_base
 
-from fastapi import Depends
-# from fastapi_users.db import SQLAlchemyBaseUserTableUUID, SQLAlchemyUserDatabase
-
 
 SQLALCHEMY_DATABASE_URL = "sqlite:///./sql_app.db"