DB_VERSION = 1


def check_db(conn):
    cur = conn.cursor()

    cur.execute("SELECT value FROM meta WHERE name='version'")

    ver = cur.fetchone()
    if ver:
        ver = int(ver)

        if ver < DB_VERSION:
            upgrade_db(conn, ver, DB_VERSION)
    else:
        with open('sql/ledd.sql', 'r') as f:
            cur.executescript(f.read())
            conn.commit()


def upgrade_db(conn, old, new):
    pass