-- SPDX-FileCopyrightText: 2023 Louis Hollingworth <louis@hollingworth.nl>
--
-- SPDX-License-Identifier: AGPL-3.0-or-later

-- Add up migration script here

CREATE OR REPLACE FUNCTION manage_updated_at(_tbl regclass) RETURNS VOID AS $$
BEGIN
    EXECUTE format('CREATE TRIGGER set_updated_at BEFORE UPDATE ON %s
        FOR EACH ROW EXECUTE PROCEDURE set_updated_at()', _tbl);
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION set_updated_at() RETURNS trigger AS $$
BEGIN
    IF (
        NEW IS DISTINCT FROM OLD AND
        NEW.updated_at IS NOT DISTINCT FROM OLD.updated_at
    ) THEN
        NEW.updated_at := NOW();
    END IF;
    RETURN NEW;
END;
$$ LANGUAGE plpgsql