Inserts or overrides slc in the database.

        remote_id and import_time fields in params_dict are set to track the
        slice origin and ensure correct overrides for multiple imports.
        Slice.perm is used to find the datasources and connect them.

        :param Slice slc_to_import: Slice object to import
        :param Slice slc_to_override: Slice to replace, id matches remote_id
        :returns: The resulting id for the imported slice
        :rtype: int

def import_obj(cls, slc_to_import, slc_to_override, import_time=None):
        """Inserts or overrides slc in the database.

        remote_id and import_time fields in params_dict are set to track the
        slice origin and ensure correct overrides for multiple imports.
        Slice.perm is used to find the datasources and connect them.

        :param Slice slc_to_import: Slice object to import
        :param Slice slc_to_override: Slice to replace, id matches remote_id
        :returns: The resulting id for the imported slice
        :rtype: int
        """
        session = db.session
        make_transient(slc_to_import)
        slc_to_import.dashboards = []
        slc_to_import.alter_params(
            remote_id=slc_to_import.id, import_time=import_time)

        slc_to_import = slc_to_import.copy()
        params = slc_to_import.params_dict
        slc_to_import.datasource_id = ConnectorRegistry.get_datasource_by_name(
            session, slc_to_import.datasource_type, params['datasource_name'],
            params['schema'], params['database_name']).id
        if slc_to_override:
            slc_to_override.override(slc_to_import)
            session.flush()
            return slc_to_override.id
        session.add(slc_to_import)
        logging.info('Final slice: {}'.format(slc_to_import.to_json()))
        session.flush()
        return slc_to_import.id