backtrace-delete-attachments.php

<?php
add_action( 'delete_attachment', function( $postid ) {
    $past_backtrace = get_option( 'backtrace_for_deletion', [] );
    $current_backtrace = debug_backtrace();

    $past_backtrace[] = json_encode( $current_backtrace );
    update_option( 'backtrace_for_deletion', $past_backtrace );
});

    $backtraces = get_option( 'backtrace_for_deletion' );
    foreach( $backtraces as $backtrace ) {
        ?>
        <pre>
        <?php
            print_r( json_decode( $backtrace ) );
            echo '-----------------------------------------------------------------------------------';
        ?>
        </pre>
        <?php
    }