public static function build_models()
 {
     // Build Databases
     \PodloveSubscribeButton\Model\Button::build();
     if (is_multisite()) {
         \PodloveSubscribeButton\Model\NetworkButton::build();
     }
     // Set Button "default" values
     $default_values = array('size' => 'big', 'autowidth' => 'on', 'color' => '#599677', 'style' => 'filled', 'format' => 'rectangle');
     foreach ($default_values as $option => $default_value) {
         if (!get_option('podlove_subscribe_button_default_' . $option)) {
             update_option('podlove_subscribe_button_default_' . $option, $default_value);
         }
     }
 }