@POST
  @Path("/unmark-as-printed")
  @Consumes(MediaType.APPLICATION_JSON)
  @Produces(MediaType.APPLICATION_JSON)
  public Response unmarkAsPrinted(@Context HttpServletRequest request, String body)
      throws Exception {
    authService.guardAuthenticatedUser(request);

    int i = 0;
    for (UUID uuid : registrationListRequest(body)) {
      try (Connection c = dataSource.getConnection()) {
        registrationsSqlMapper.replacePrintedNametag(c, uuid, Option.none());
      }
      i++;
    }

    return Response.ok(
            ArgoUtils.format(
                Result.success(String.format("Avmarkerade %s namnbrickor som utskrivna.", i))))
        .build();
  }