backend/app/database.py

"""Database connection and session management for Project Memory."""

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, declarative_base
from pathlib import Path

# Database file location
DB_PATH = Path(__file__).parent.parent / "project_memory.db"
DATABASE_URL = f"sqlite:///{DB_PATH}"

# Create engine with SQLite-specific settings
engine = create_engine(
    DATABASE_URL,
    connect_args={"check_same_thread": False},  # Needed for SQLite
    echo=False,  # Set to True for SQL debugging
)

# Session factory
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# Base class for models
Base = declarative_base()


def get_db():
    """Dependency that provides a database session."""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


def init_db():
    """Initialize database tables."""
    from app import models  # noqa: F401 - Import models to register them
    Base.metadata.create_all(bind=engine)