from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, Session
from .config import settings

engine = create_engine(settings.DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()


# Database dependency with connection pooling
def get_db():
    db = SessionLocal()
    try:
        yield db
    except Exception as e:
        db.rollback()
        raise
    finally:
        db.close()