"""Singleton extension instances; bound to the app in create_app()."""

from sqlalchemy.ext.asyncio import AsyncEngine, async_sessionmaker, create_async_engine

from .config import get_config


def make_engine() -> AsyncEngine:
    cfg = get_config()
    return create_async_engine(cfg.database_url, pool_pre_ping=True, future=True)


def make_session_factory(engine: AsyncEngine) -> async_sessionmaker:
    return async_sessionmaker(engine, expire_on_commit=False)