Get all names that have ever existed, paginated
        Return {'status': true, 'names': [...]} on success
        Return {'error': ...} on error

def rpc_get_all_names_cumulative( self, offset, count, **con_info ):
        """
        Get all names that have ever existed, paginated
        Return {'status': true, 'names': [...]} on success
        Return {'error': ...} on error
        """
        if not check_offset(offset):
            return {'error': 'invalid offset', 'http_status': 400}

        if not check_count(count, 100):
            return {'error': 'invalid count', 'http_status': 400}

        db = get_db_state(self.working_dir)
        all_names = db.get_all_names( offset=offset, count=count, include_expired=True )
        db.close()

        return self.success_response( {'names': all_names} )