from sqlalchemy import create_engine
from sqlalchemy.orm import DeclarativeBase, sessionmaker
from app.config import settings
connect_args={"check_same_thread":False} if settings.DATABASE_URL.startswith("sqlite") else {}
engine=create_engine(settings.DATABASE_URL, connect_args=connect_args)
SessionLocal=sessionmaker(bind=engine, autocommit=False, autoflush=False)
class Base(DeclarativeBase): pass
def get_db():
    db=SessionLocal()
    try: yield db
    finally: db.close()