config_data_rollback.php

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<?php
$objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
$resource = $objectManager->get(\Magento\Framework\App\ResourceConnection::class);
$connection = $resource->getConnection();
$tableName = $resource->getTableName('core_config_data');

$connection->query("DELETE FROM $tableName WHERE path = 'design/header/welcome';");