group_fqcd_jr/app/infrastructure/db.py

from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
from sqlalchemy.pool import NullPool

from app.core.config import get_settings

settings = get_settings()
engine = create_async_engine(
    settings.mysql_dsn,
    pool_pre_ping=settings.mysql_pool_pre_ping,
    poolclass=NullPool,
)
SessionFactory = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)