This works if add this code in functions.php
?
if ( ! function_exists( 'test_setup' ) ) :
function test_setup() {
$ar = array(
'price_content' => 'hello'
);
$result = $wpdb->insert('hs_prices', $ar); // insert 'hello' into 'price_content'
}
add_action( 'after_setup_theme', 'test_setup' );