def get_last_tid(self):
        try:
            spec = {'tid': {'$gt': 0}}
            sort = [('tid', -1)]
            row = self.db.docs.find_one(spec, sort=sort)
        except Exception as e:
            raise DatabaseException(e)
        if row:
            return row['tid']
        return 0
def _deDuplicate(results):
        found = dict()
        deDuped = list()
        for entry in results:
            dn = entry.get("dn")
            if not dn in found:
                found[dn] = 1
                deDuped.append(entry)

        return deDuped