backend/database.py

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, DeclarativeBase
from .core.config import settings

class Base(DeclarativeBase):
    pass

engine = create_engine(settings.DATABASE_URL, connect_args={"check_same_thread": False} if settings.DATABASE_URL.startswith("sqlite") else {})
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

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