backend/database.py

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

DATABASE_URL = "sqlite:///./smartstudy.db"

engine = create_engine(
    DATABASE_URL,
    connect_args={"check_same_thread": False}
)

SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

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

def create_tables():
    from app.db.models import User, QuizResult, StudySession, FlashcardProgress
    Base.metadata.create_all(bind=engine)
    print("✅ Tables créées avec succès")