diff --git a/apps/backend/src/db/migrations/129_fulfillment_retry_semantics.sql b/apps/backend/src/db/migrations/129_fulfillment_retry_semantics.sql
index 304a1f34..b1851b38 100644
--- a/apps/backend/src/db/migrations/129_fulfillment_retry_semantics.sql
+++ b/apps/backend/src/db/migrations/129_fulfillment_retry_semantics.sql
@@ -90,6 +90,27 @@ SET internal_sku = canonicalize_internal_sku(internal_sku),
     updated_at = NOW()
 WHERE internal_sku <> canonicalize_internal_sku(internal_sku);
 
+-- 人工 SKU 登记表是扫描派生数据。历史数据可能因大小写/空白差异登记了多行，
+-- 规范化后会撞唯一键；先去重，优先保留有配置、统计更完整且更新时间更晚的行。
+WITH ranked_registry AS (
+  SELECT
+    id,
+    ROW_NUMBER() OVER (
+      PARTITION BY canonicalize_internal_sku(sku_key)
+      ORDER BY
+        (config_id IS NOT NULL) DESC,
+        item_count DESC,
+        updated_at DESC,
+        id DESC
+    ) AS candidate_rank
+  FROM manual_sku_registry
+  WHERE canonicalize_internal_sku(sku_key) IS NOT NULL
+)
+DELETE FROM manual_sku_registry registry
+USING ranked_registry ranked
+WHERE registry.id = ranked.id
+  AND ranked.candidate_rank > 1;
+
 UPDATE manual_fulfillment_configs
 SET sku_key = canonicalize_internal_sku(sku_key),
     updated_at = NOW()