-- v2: add trigger to keep updated_at in sync
CREATE OR REPLACE FUNCTION touch_updated_at()
RETURNS TRIGGER AS $$
BEGIN
  NEW.updated_at = NOW();
  RETURN NEW;
END;
$$ LANGUAGE plpgsql;

DROP TRIGGER IF EXISTS trg_touch_tarifs_updated_at ON tarifs;
CREATE TRIGGER trg_touch_tarifs_updated_at
BEFORE UPDATE ON tarifs
FOR EACH ROW
EXECUTE PROCEDURE touch_updated_at();