WP_Model-Seed.php

<?php

function seedHook(){    
    if(@$_REQUEST['seed'] === 'true'){
        for($i = 0; $i < 50; $i++){ 
            Product::insert([
                "title" => "Product ". (count(Product::all())+1),
                "color" => array_values(["green", "red", "blue"])[rand(0, 2)],
                "price" => rand(50, 2000),
            ]);
        }
    }
}
add_action('init', 'seedHook');

function seedButton($wp_admin_bar){
    $wp_admin_bar->add_node([
        'id' => 'seed-button',
        'title' => 'Seed',
        'href' => admin_url('/edit.php?'. http_build_query(['seed' => 'true', 'post_type' => Product::getPostType()])),
    ]);
}
add_action('admin_bar_menu', 'seedButton', 50);