backend/database.py

from pathlib import Path
from sqlalchemy import create_engine
from sqlalchemy.orm import DeclarativeBase, sessionmaker
from .config import settings

_db_path = settings.DATABASE_URL.replace("sqlite:///", "")
Path(_db_path).parent.mkdir(parents=True, exist_ok=True)

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


class Base(DeclarativeBase):
    pass


def create_tables():
    from . import models  # noqa: F401
    Base.metadata.create_all(bind=engine)


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