Full-stack blocks

return [
    'storage'    => 'sqlite',
    'userScoped' => true,
    'capability' => [
        'create' => true,
        'read'   => true,
        'update' => true,
        'delete' => true,
    ],
    'fields' => [
        'text' => [
            'type'     => 'string',
            'required' => true,
        ],
        'done' => [
            'type'    => 'boolean',
            'default' => false,
        ],
    ],
];

return [
    'toggle' => function (array $params): array {
        $db   = Db::get('my-theme/todo');
        $todo = $db->get_record((int) $params['id']);
        $db->update((int) $params['id'], [
            'done' => !$todo['done'],
        ]);
        return ['success' => true];
    },
    'clear_done' => function (array $params): array {
        $db    = Db::get('my-theme/todo');
        $todos = $db->list();
        foreach ($todos as $todo) {
            if ($todo['done']) {
                $db->delete((int) $todo['id']);
            }
        }
        return ['cleared' => true];
    },
];