import os

from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
from sqlalchemy.orm import DeclarativeBase

DATABASE_URL = os.getenv(
    "DATABASE_URL", "postgresql+asyncpg://postgres:postgres@localhost:5432/arbret"
)

engine = create_async_engine(DATABASE_URL)
async_session = async_sessionmaker(engine, expire_on_commit=False)


class Base(DeclarativeBase):
    pass


async def get_db():
    async with async_session() as session:
        yield session