-- 补 product.serialcursor（产品级授权码序号游标，新代码 allocSerialRange 依赖它）
-- 初值 = 该产品现有授权码的 max(number)，让新批次序号接在老数据之后。
\set ON_ERROR_STOP on
BEGIN;

ALTER TABLE product ADD COLUMN IF NOT EXISTS serialcursor bigint DEFAULT 0;
UPDATE product SET serialcursor = 0 WHERE serialcursor IS NULL;

DO $$
DECLARE p record; tbl text; mx bigint;
BEGIN
  FOR p IN SELECT id FROM product ORDER BY id LOOP
    tbl := format('license_%s', to_hex(p.id));
    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_schema='public' AND table_name = tbl) THEN
      EXECUTE format('SELECT COALESCE(MAX(number), 0) FROM %I', tbl) INTO mx;
      -- 只抬高不降低，重复执行安全
      UPDATE product SET serialcursor = GREATEST(COALESCE(serialcursor, 0), mx) WHERE id = p.id;
    END IF;
  END LOOP;
END $$;

COMMIT;