How to use the reprozip.traceutils.combine_traces function in reprozip

for i, dat in enumerate(sql_data):
            trace = self.tmpdir / ('trace%d.sqlite3' % i)
            if PY3:
                conn = sqlite3.connect(str(trace))
            else:
                conn = sqlite3.connect(trace.path)
            conn.row_factory = sqlite3.Row
            conn.executescript(dat + 'COMMIT;')
            conn.commit()
            conn.close()

            traces.append(trace)

        target = self.tmpdir / 'target'
        traceutils.combine_traces(traces, target)
        target = target / 'trace.sqlite3'

        if PY3:
            conn = sqlite3.connect(str(target))
        else:
            conn = sqlite3.connect(target.path)
        conn.row_factory = None
        processes = list(conn.execute(
            '''
            SELECT * FROM processes;
            '''))
        opened_files = list(conn.execute(
            '''
            SELECT * FROM opened_files;
            '''))
        executed_files = list(conn.execute(

Reads in multiple trace databases and combines them into one.

    The runs from the original traces are appended ('run_id' field gets
    translated to avoid conflicts).
    """
    traces = []
    for tracepath in args.traces:
        if tracepath == '-':
            tracepath = Path(args.dir) / 'trace.sqlite3'
        else:
            tracepath = Path(tracepath)
            if tracepath.is_dir():
                tracepath = tracepath / 'trace.sqlite3'
        traces.append(tracepath)

    reprozip.traceutils.combine_traces(traces, Path(args.dir))
    reprozip.tracer.trace.write_configuration(Path(args.dir),
                                              args.identify_packages,
                                              args.find_inputs_outputs,
                                              overwrite=True)