diff --git a/pipeline_platform/platform_ability.py b/pipeline_platform/platform_ability.py
index 561b4ad..59fd7e0 100644
--- a/pipeline_platform/platform_ability.py
+++ b/pipeline_platform/platform_ability.py
@@ -720,16 +720,54 @@ async def _h_apply_model_pricing(sor, params, ctx):
         pp_desc = "定价出处：%s | 文档原文：%s" % (doc_url or "(未提供)", desc_quotes)
         now = time.strftime('%Y-%m-%d')
         if old_ppid:
-            # 幂等更新：新时序行（拉链——旧行 expired_date 截到今天）
             ppid = old_ppid
+            # 幂等核心（2026-09-05 用户纠正：时序应只有一条有效行，重复执行不得堆历史）：
+            # 先取当前生效行比对内容——
+            #   内容相同 → 跳过（不产生新时序行）
+            #   内容不同且生效行今天才启用 → 原地 UPDATE（同日替换无历史区间可保留，
+            #     拉链会产生 enabled==expired 的零宽死行，纯垃圾）
+            #   内容不同且生效行是历史日期 → 正常拉链（关旧行+插新行）
+            recs2 = await sor.sqlExe(
+                "SELECT id, pricing_data, enabled_date FROM pricing_program_timing "
+                "WHERE ppid=${p}$ AND expired_date='9999-12-31' "
+                "ORDER BY enabled_date DESC LIMIT 1", {"p": ppid})
+            await sor.sqlExe("COMMIT", {})
+            cur = recs2[0] if recs2 else None
+            same = False
+            if cur is not None:
+                try:
+                    same = (yaml.safe_load(getattr(cur, 'pricing_data', '') or '{}')
+                            == yaml.safe_load(yaml_str))
+                except Exception:
+                    same = (getattr(cur, 'pricing_data', '') or '') == yaml_str
+            await sor.sqlExe(
+                "UPDATE pricing_program SET description=${d}$ WHERE id=${i}$",
+                {"d": pp_desc[:1000], "i": ppid})
+            await sor.sqlExe("COMMIT", {})
+            if same:
+                results.append({"model": vmid, "ok": True, "ppid": ppid,
+                                "action": "无变化（幂等跳过，未产生新时序行）",
+                                "items": len(mitems), "factor": factor,
+                                "dimensions": sorted(dims_all)})
+                continue
+            if cur is not None and str(getattr(cur, 'enabled_date', ''))[:10] == now:
+                await sor.sqlExe(
+                    "UPDATE pricing_program_timing SET pricing_data=${y}$, name=${n}$ "
+                    "WHERE id=${i}$",
+                    {"y": yaml_str, "n": "%s %s计价" % (vmid, factor),
+                     "i": getattr(cur, 'id', '')})
+                await sor.sqlExe("COMMIT", {})
+                action = "原地更新（同日替换，不产生历史行）"
+                results.append({"model": vmid, "ok": True, "ppid": ppid,
+                                "action": action, "items": len(mitems),
+                                "factor": factor, "dimensions": sorted(dims_all)})
+                continue
+            # 历史生效行 → 拉链
             await sor.sqlExe(
                 "UPDATE pricing_program_timing SET expired_date=${d}$ "
                 "WHERE ppid=${p}$ AND expired_date='9999-12-31'",
                 {"d": now, "p": ppid})
-            await sor.sqlExe(
-                "UPDATE pricing_program SET description=${d}$ WHERE id=${i}$",
-                {"d": pp_desc[:1000], "i": ppid})
-            action = "更新（新时序生效 %s）" % now
+            action = "更新（拉链：旧行截至今日，新时序生效 %s）" % now
         else:
             ppid = getID()
             await sor.C("pricing_program", {