diff --git a/sanguo_portfolio/providers/local_unified_provider.py b/sanguo_portfolio/providers/local_unified_provider.py
index 5111fda..fa271bf 100644
--- a/sanguo_portfolio/providers/local_unified_provider.py
+++ b/sanguo_portfolio/providers/local_unified_provider.py
@@ -669,9 +669,11 @@ class LocalUnifiedProvider(DataProvider):  # type: ignore[misc]
 
         filters.filter_st_stock / filter_new_stock 逐只调 get_security_info, 每只 2 条
         SQL(dbbardata min/max + constituent_unified name); 03 每日 10 行业×几百只、02/01
-        调仓千次 → 万次查询。本方法一次查全:
-        - dbbardata: ``symbol IN (...) GROUP BY symbol, exchange`` 拿 min/max(走索引)
-        - constituent_unified: ``code IN (...)`` 拿 code_name
+        调仓千次 → 万次查询。本方法:
+        - dbbardata: 逐对双 seek(ORDER BY ±datetime LIMIT 1, 见 _minmax_seek_sql)拿
+          min/max——IN+GROUP BY 形态在无统计信息库会被选去单列 interval 索引整扫
+          (2026-08-24 生产实锤 30 只冷 101s); 双 seek 每股恰 2 次寻位(实测 0.004s/30 只)
+        - constituent_unified: ``code IN (...)`` 拿 code_name(批量不变)
         返回 {jq_code: {code, display_name, name, start_date, end_date, type}}, 与逐只逐字一致。
         """
         if not securities: