uninstall.php

<?php

/**
 * @var rex_addon $this
 * @psalm-scope-this rex_addon
 */

$sql = rex_sql::factory();
$sql->setQuery('DELETE FROM `' . rex::getTable('yform_table') . '` WHERE table_name = "' . rex::getTable('ycom_user') . '"');
$sql->setQuery('DELETE FROM `' . rex::getTable('yform_field') . '` WHERE table_name = "' . rex::getTable('ycom_user') . '"');
$sql->setQuery('DELETE FROM `' . rex::getTable('yform_history') . '` WHERE table_name = "' . rex::getTable('ycom_user') . '"');

rex_sql_table::get(rex::getTable('article'))
    ->removeColumn('ycom_auth_type')
    ->removeColumn('ycom_group_type')
    ->removeColumn('ycom_groups')
    ->alter();

rex_sql_table::get(rex::getTable('ycom_user_session'))
    ->drop();

rex_sql_table::get(rex::getTable('ycom_user'))
    ->drop();

foreach ($this->getInstalledPlugins() as $plugin) {
    // use path relative to __DIR__ to get correct path in update temp dir
    $file = __DIR__ . '/plugins/' . $plugin->getName() . '/uninstall.php';

    if (file_exists($file)) {
        $plugin->includeFile($file);
    }
}

rex_yform_manager_table::deleteCache();