Stored procedure, drop all entries in all tables in Postgres without dropping or truncating, with optional ignoring.

postgres_delete_all.sql

DECLARE
    statements CURSOR FOR
        SELECT tablename FROM pg_tables
        WHERE tableowner = username AND schemaname = 'public';
BEGIN
    FOR stmt IN statements LOOP
	IF stmt.tablename != 'algorithm' THEN
		EXECUTE 'TRUNCATE TABLE ' || quote_ident(stmt.tablename) || ' CASCADE;';
	END IF;
    END LOOP;
END;
$$ LANGUAGE plpgsql;