how to set sqlalchemy.url  in alembic.ini if I have from pydantic import BaseSettings, PostgresDsn, Field


class Settings(BaseSettings):
    db_url: PostgresDsn
    db_port: int
    db_user: str
    db_name: str
    db_pass: str
    db_host: str
    port: int
    host: str

    class Config:
        env_file = '.env'


settings = Settings()  is that correct sqlalchemy.url = f"postgresql+asyncpg://{settings.database_user}:{settings.database_password}@{settings.database_host}:{settings.database_port}/{settings.database_name}"?async_fallback=True
