Allow multiple npz files

        files = [Path(f) for f in files]

        if str(files[0]).endswith(".npz"):

            file = files[0]

            data: WorkloadData | None = None

            for file in files:

                print(f"Loading {file}")

            result, args_from_file = self.load_snapshot(file)

                new_data, args_from_file = self.load_snapshot(file)

                print(f"File was generated with: --system {args_from_file.system}")

                if not data:

                    data = new_data

                else:

                    data.jobs.extend(new_data.jobs)

                    data.telemetry_start = min(data.telemetry_start, new_data.telemetry_start)

                    data.telemetry_end = min(data.telemetry_end, new_data.telemetry_end)

                    data.start_date = min(data.start_date, new_data.start_date)

        else:  # custom data loader

            result = self.load_data(files)

        self.update_jobs(result.jobs)

        return result

            data = self.load_data(files)

        self.update_jobs(data.jobs)

        return data

    def update_jobs(self, jobs: list[Job]):

        """ Updates jobs with new scale or random start times """