import sqlite3
from contextlib import contextmanager
from backend.config import settings

def get_db_connection() -> sqlite3.Connection:
    conn = sqlite3.connect(settings.DB_FILE)
    conn.row_factory = sqlite3.Row
    conn.execute("PRAGMA journal_mode=WAL")
    conn.execute("PRAGMA foreign_keys=ON")
    return conn

@contextmanager
def db_connection():
    """Context manager for sqlite3 connection with auto-commit/rollback and cleanup."""
    conn = get_db_connection()
    try:
        yield conn
        conn.commit()
    except Exception:
        conn.rollback()
        raise
    finally:
        conn.close()