<?php
global $wpdb;

// Define table names
$fbv_table = $wpdb->prefix . 'fbv';
$fbv_rel_table = $wpdb->prefix . 'fbv_attachment_folder';

// Folder ID from previous step (or hardcoded to 1)
$folder_id = 1;

// Attachment ID (or list of IDs)
$attachment_ids = [26913]; 

foreach ($attachment_ids as $attachment_id) {
    // Check if relationship exists
    $existing = $wpdb->get_row( $wpdb->prepare("SELECT folder_id FROM $fbv_rel_table WHERE attachment_id = %d", $attachment_id) );

    if ($existing) {
        // Update existing relationship
        $wpdb->update(
            $fbv_rel_table,
            array('folder_id' => $folder_id),
            array('attachment_id' => $attachment_id)
        );
        echo "Updated attachment $attachment_id to folder $folder_id\n";
    } else {
        // Insert new relationship
        $wpdb->insert(
            $fbv_rel_table,
            array(
                'folder_id' => $folder_id,
                'attachment_id' => $attachment_id
            )
        );
        echo "Assigned attachment $attachment_id to folder $folder_id\n";
    }
}
?>