def add_identities(cls, db, identities, backend):
        logger.info("Adding the identities to SortingHat")
        total = 0
        for identity in identities:
            try:
                cls.add_identity(db, identity, backend)
                total += 1
            except Exception as e:
                logger.error("Unexcepted error when adding identities: %s" % e)
                continue
        logger.info("Total identities added to SH: %i", total)