def METHOD_NAME(request):
    """
    Unset read flag for a list of feedback items
    :param request: Object representing the user call
    :type request: ~django.http.HttpRequest
    :return: A redirection to the admin feedback list
    :rtype: ~django.http.HttpResponseRedirect
    """
    selected_ids = request.POST.getlist("selected_ids[]")
    selected_feedback = Feedback.objects.filter(id__in=selected_ids, is_technical=True)
    for feedback in selected_feedback:
        invalidate_obj(feedback)
        if hasattr(feedback, "feedback_ptr"):
            invalidate_obj(feedback.feedback_ptr)
    selected_feedback.update(read_by=None)
    logger.debug(
        "Feedback objects %r marked as unread by %r", selected_ids, request.user
    )
    messages.success(request, _("Feedback was successfully marked as unread"))
    return redirect("admin_feedback")