# backend/database.py
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, scoped_session

SQLALCHEMY_DATABASE_URL = "sqlite:///./app.db"  # или PostgreSQL URL

engine = create_engine(SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False})
SessionLocal = scoped_session(sessionmaker(autocommit=False, autoflush=False, bind=engine))

def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()