diff --git a/src/Backend/SolutionErp.Infrastructure/Persistence/DbInitializer.cs b/src/Backend/SolutionErp.Infrastructure/Persistence/DbInitializer.cs
index f0ead47..f401a25 100644
--- a/src/Backend/SolutionErp.Infrastructure/Persistence/DbInitializer.cs
+++ b/src/Backend/SolutionErp.Infrastructure/Persistence/DbInitializer.cs
@@ -71,11 +71,11 @@ public static class DbInitializer
         //   - SeedDemoPurchaseEvaluationsAsync ([DEMO] PE 4 sample)
         //   - SeedSampleApprovalWorkflowsV2Async (V2 sample mẫu UAT cho type B)
         //   - SeedSampleContractWorkflowV2Async (V2 sample mẫu UAT cho Contract — Mig 32 Plan B Chunk A2)
-        // GIỮ: SeedRoles, SeedAdmin, SeedDepartments, SeedDemoUsers (30 user UAT),
-        // SeedMenuTree, SeedAdminPermissions, SeedDemoMasterData (Supplier/Project
-        // master), SeedContractTemplates (file template), SeedCatalogs, backfill
-        // helpers. Production UAT clean slate: bro toàn quyền setup workflow mới
-        // qua Designer.
+        // GIỮ (ungated): SeedRoles, SeedAdmin, SeedDepartments, SeedDemoUsers (chỉ user THẬT
+        // — S89 đã gỡ user test khỏi mảng), SeedMenuTree, SeedAdminPermissions,
+        // SeedContractTemplates (file template), SeedCatalogs, SeedRealMasterData (62 dự án +
+        // 71 hạng mục + 3 NCC thật). [S91 2026-06-26] SeedDemoMasterData (Supplier/Project
+        // DEMO) ĐÃ chuyển sang GATED — prod skip để không resurrect 18 NCC demo đã wipe go-live.
         var config = sp.GetRequiredService<IConfiguration>();
         var demoSeedDisabled = config.GetValue<bool>("DemoSeed:Disabled");
         if (demoSeedDisabled)
@@ -108,7 +108,14 @@ public static class DbInitializer
         await SeedMeetingRoomsAsync(db, logger);
         await SeedMenuTreeAsync(db, logger);
         await SeedAdminPermissionsAsync(db, roleManager, logger);
-        await SeedDemoMasterDataAsync(db, logger);
+        // [S91 2026-06-26 — anh Kiệt FDC go-live] GATE demo master (Supplier/Project demo)
+        // sau cờ DemoSeed:Disabled. Trước đây ungated → SeedDemoMasterDataAsync per-code
+        // idempotent RESURRECT 18 NCC demo (NCC-VLXD/CDT-VIN/Sun Group…) mỗi restart sau khi
+        // đã wipe (scripts/s91-wipe-golive.sql). Prod Disabled=true → SKIP → giữ wipe BỀN;
+        // Dev Disabled=false → vẫn seed demo local. Master data THẬT (62 dự án + 71 hạng mục
+        // + 3 NCC) đến từ SeedRealMasterDataAsync (ungated, dưới) — KHÔNG ảnh hưởng.
+        if (!demoSeedDisabled)
+            await SeedDemoMasterDataAsync(db, logger);
         await SeedContractTemplatesAsync(db, logger);
         if (!demoSeedDisabled)
         {