import os

from sqlalchemy import MetaData
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine

DB_USER = os.getenv("DB_USER", "trading")
DB_PASS = os.getenv("DB_PASSWORD", "")
DB_HOST = os.getenv("DB_HOST", "hermes-pgdb-rw.customer1.svc.cluster.local")
DB_PORT = os.getenv("DB_PORT", "5432")
DB_NAME = os.getenv("DB_NAME", "trading_data")

DATABASE_URL = f"postgresql+asyncpg://{DB_USER}:{DB_PASS}@{DB_HOST}:{DB_PORT}/{DB_NAME}"

engine = create_async_engine(DATABASE_URL, echo=False, pool_size=5, max_overflow=10)
async_session = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
metadata = MetaData()