postgres update parent if entity / foreign key updates
Here is my solution.

CREATE OR REPLACE FUNCTION update_recipe_timestamp_from_entry_proc()
RETURNS TRIGGER AS $$
BEGIN
    UPDATE recipes SET modified_on = now() WHERE ident = NEW."recipe_id";
    PERFORM pg_notify('notify_recipe_update', CAST(NEW."recipe_id" AS text));
    RETURN NEW;   
END;
$$ language 'plpgsql';

DROP TRIGGER IF EXISTS update_recipes_timestamp_e ON entries;
CREATE TRIGGER update_recipes_timestamp_e BEFORE UPDATE ON entries FOR EACH ROW EXECUTE PROCEDURE update_recipe_timestamp_from_entry_proc();