diff --git a/src/Api/TakeoutSaaS.TenantApi/Services/ProductSkuSaveJobRunner.cs b/src/Api/TakeoutSaaS.TenantApi/Services/ProductSkuSaveJobRunner.cs
index 515d53f..b7e10a4 100644
--- a/src/Api/TakeoutSaaS.TenantApi/Services/ProductSkuSaveJobRunner.cs
+++ b/src/Api/TakeoutSaaS.TenantApi/Services/ProductSkuSaveJobRunner.cs
@@ -1,3 +1,4 @@
+using System.Buffers.Binary;
 using System.Text.Json;
 using Hangfire;
 using Microsoft.EntityFrameworkCore;
@@ -77,8 +78,9 @@ public sealed class ProductSkuSaveJobRunner(
             await dbContext.SaveChangesAsync();
 
             // 以租户+商品维度申请事务级咨询锁，保证同商品串行落库。
+            var advisoryLockKey = BuildAdvisoryLockKey(job.TenantId, job.ProductId);
             await dbContext.Database.ExecuteSqlInterpolatedAsync(
-                $"SELECT pg_advisory_xact_lock({job.TenantId}, {job.ProductId});");
+                $"SELECT pg_advisory_xact_lock({advisoryLockKey});");
 
             var payload = DeserializePayload(job.PayloadJson);
             if (payload.Skus.Count == 0)
@@ -194,5 +196,23 @@ public sealed class ProductSkuSaveJobRunner(
         return string.Join(Environment.NewLine, lines);
     }
 
+    private static long BuildAdvisoryLockKey(long tenantId, long productId)
+    {
+        Span<byte> raw = stackalloc byte[16];
+        BinaryPrimitives.WriteInt64LittleEndian(raw, tenantId);
+        BinaryPrimitives.WriteInt64LittleEndian(raw[8..], productId);
+
+        const ulong fnvOffsetBasis = 14695981039346656037UL;
+        const ulong fnvPrime = 1099511628211UL;
+        var hash = fnvOffsetBasis;
+        foreach (var b in raw)
+        {
+            hash ^= b;
+            hash *= fnvPrime;
+        }
+
+        return unchecked((long)hash);
+    }
+
     private sealed record JobMeta(long Id, long TenantId);
 }