"""Подключение к PostgreSQL для gost-воркера."""

from contextlib import contextmanager
from typing import Generator

from sqlalchemy import create_engine
from sqlalchemy.orm import Session, sessionmaker

from app.config import settings

engine = create_engine(
    settings.database_url_sync,
    pool_size=5,
    max_overflow=10,
    pool_pre_ping=True,
)

SessionLocal = sessionmaker(bind=engine, autocommit=False, autoflush=False)


@contextmanager
def db_session() -> Generator[Session, None, None]:
    """Контекстный менеджер для сессии БД."""
    session = SessionLocal()
    try:
        yield session
        session.commit()
    except Exception:
        session.rollback()
        raise
    finally:
        session.close()