from sqlalchemy import create_engine
  from sqlalchemy.ext.declarative import declarative_base
  from sqlalchemy.orm import sessionmaker
  
  SQLALCHEMY_DATABASE_URL = "sqlite:///./test.db"
  engine = create_engine(SQLALCHEMY_DATABASE_URL)
  SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
  Base = declarative_base()