def get_name(cursor):
    cursor.execute("SELECT name FROM metadata LIMIT 1")
    row = cursor.fetchone()
    return row['name'] if row else None

def set_name(cursor, value):
    cursor.execute("UPDATE metadata SET name = %s", (value,))

def get_comment(cursor):
    cursor.execute("SELECT comment FROM metadata LIMIT 1")
    row = cursor.fetchone()
    return row['comment'] if row else None

def set_comment(cursor, value):
    cursor.execute("UPDATE metadata SET comment = %s", (value,))

def get_public_key(cursor):
    cursor.execute("SELECT public_key FROM metadata LIMIT 1")
    row = cursor.fetchone()
    return row['public_key'] if row else None

def get_private_key(cursor):
    cursor.execute("SELECT private_key FROM metadata LIMIT 1")
    row = cursor.fetchone()
    return row['private_key'] if row else None

def set_keys(cursor, public_key, private_key):
    """
    Sets both public and private keys together
    """
    cursor.execute("""
        UPDATE metadata
        SET public_key = %s, private_key = %s
    """, (public_key, private_key))