<?php
global $wpdb;
$table_name = $wpdb->prefix . 'fbv';
$folder_name = 'Libros';
$parent_id = 0;
$created_by = 1;

$existing = $wpdb->get_row( $wpdb->prepare( "SELECT id FROM $table_name WHERE name = %s AND parent = %d", $folder_name, $parent_id ) );

if ( $existing ) {
    echo "Folder 'Libros' already exists with ID: " . $existing->id;
} else {
    $wpdb->insert(
        $table_name,
        array(
            'name' => $folder_name,
            'parent' => $parent_id,
            'type' => 0,
            'ord' => 0,
            'created_by' => $created_by
        )
    );
    echo "Created folder 'Libros' with ID: " . $wpdb->insert_id;
}
?>