CREATE OR REPLACE FUNCTION import.del_import(imp_id int) RETURNS void AS
$$
DECLARE
    tmp RECORD;
BEGIN
    FOR tmp IN
        SELECT relation, array_agg(key) AS keys
            FROM import.track_imports
            WHERE import_id = imp_id AND NOT deletion
            GROUP BY relation
    LOOP
        EXECUTE format('DELETE FROM %s WHERE id = ANY($1)', tmp.relation)
            USING tmp.keys;
    END LOOP;
END;
$$
LANGUAGE plpgsql;