I have app_settings.py from pydantic import BaseSettings, PostgresDsn


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

    class Config:
        env_file = ".env"
        env_file_encoding = "utf-8"


settings = Settings() and .env # app configuration
HOST=127.0.0.1
PORT=8000

# db configuration
DB_HOST=localhost
DB_URL=postgresql://postgres:as@localhost:5432/logging
DB_PORT=5432
DB_NAME=logging
DB_USER=postgres
DB_PASS=as  and when I try to do alembic --revision I got en error. Here alembic .env from logging.config import fileConfig

from sqlalchemy import engine_from_config
from sqlalchemy import pool

from alembic import context

from src.settings.app_settings import settings

import os
import sys

sys.path.append(os.path.join(sys.path[0], 'src'))

from src.db.tables import Log

# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config

section = config.config_ini_section
config.set_section_option(section, "DB_HOST", settings.db_host)
config.set_section_option(section, "DB_PORT", settings.db_port)
config.set_section_option(section, "DB_USER", settings.db_user)
config.set_section_option(section, "DB_NAME", settings.db_name)
config.set_section_option(section, "DB_PASS", settings.db_pass)

# Interpret the config file for Python logging.
# This line sets up loggers basically.
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import my model
# target_metadata = my model.Base.metadata
target_metadata = Log.metadata


# other values from the config, defined by the needs of env.py,
# can be acquired:
# my_important_option = config.get_main_option("my_important_option")
# ... etc.


def run_migrations_offline() -> None:
    """Run migrations in 'offline' mode.

    This configures the context with just a URL
    and not an Engine, though an Engine is acceptable
    here as well.  By skipping the Engine creation
    we don't even need a DBAPI to be available.

    Calls to context.execute() here emit the given string to the
    script output.

    """
    url = config.get_main_option("sqlalchemy.url")
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    """Run migrations in 'online' mode.

    In this scenario we need to create an Engine
    and associate a connection with the context.

    """
    connectable = engine_from_config(
        config.get_section(config.config_ini_section, {}),
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )

    with connectable.connect() as connection:
        context.configure(
            connection=connection, target_metadata=target_metadata
        )

        with context.begin_transaction():
            context.run_migrations()


if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()