diff --git a/scripts/sql/clean-transactional-uat.sql b/scripts/sql/clean-transactional-uat.sql
new file mode 100644
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+++ b/scripts/sql/clean-transactional-uat.sql
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+-- =================================================================
+-- Clean transactional data cho UAT V2 schema (Mig 22-24, Session 17)
+-- =================================================================
+-- Xóa:    PE / Contract / Budget + tất cả con cháu + Notifications + CodeSequences
+-- Giữ:    Master data (Users, Suppliers, Projects, Departments, MaterialItems,
+--         ServiceItems, WorkItems, UnitsOfMeasure, MenuItems, Permissions, Roles)
+--         + Workflow config (V1 PurchaseEvaluationWorkflowDefinitions, WorkflowDefinitions
+--           legacy + V2 ApprovalWorkflows/Steps/Levels) + ContractTemplates/Clauses
+--
+-- USAGE:
+--   Local Dev:   sqlcmd -S "(localdb)\MSSQLLocalDB" -d SolutionErp_Dev -i scripts\sql\clean-transactional-uat.sql
+--   Prod (VPS):  paste vào SSMS hoặc sqlcmd connect prod DB
+--
+-- ⚠ DESTRUCTIVE — backup trước nếu data còn cần.
+-- =================================================================
+
+-- Required cho filtered indexes (Mig 19/20) — sqlcmd default off
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+PRINT '====================================================';
+PRINT 'Clean transactional data START at ' + CONVERT(varchar, GETUTCDATE(), 120) + ' UTC';
+PRINT '====================================================';
+
+BEGIN TRANSACTION;
+
+-- ===== 1. PE module — child rows trước (FK Cascade chain) =====
+DELETE FROM dbo.PurchaseEvaluationDepartmentApprovals;
+PRINT '  PE.DepartmentApprovals    : ' + CAST(@@ROWCOUNT as varchar) + ' rows deleted';
+DELETE FROM dbo.PurchaseEvaluationDepartmentOpinions;
+PRINT '  PE.DepartmentOpinions     : ' + CAST(@@ROWCOUNT as varchar) + ' rows deleted';
+DELETE FROM dbo.PurchaseEvaluationAttachments;
+PRINT '  PE.Attachments            : ' + CAST(@@ROWCOUNT as varchar) + ' rows deleted';
+DELETE FROM dbo.PurchaseEvaluationChangelogs;
+PRINT '  PE.Changelogs             : ' + CAST(@@ROWCOUNT as varchar) + ' rows deleted';
+DELETE FROM dbo.PurchaseEvaluationApprovals;
+PRINT '  PE.Approvals              : ' + CAST(@@ROWCOUNT as varchar) + ' rows deleted';
+DELETE FROM dbo.PurchaseEvaluationQuotes;
+PRINT '  PE.Quotes                 : ' + CAST(@@ROWCOUNT as varchar) + ' rows deleted';
+DELETE FROM dbo.PurchaseEvaluationDetails;
+PRINT '  PE.Details                : ' + CAST(@@ROWCOUNT as varchar) + ' rows deleted';
+DELETE FROM dbo.PurchaseEvaluationSuppliers;
+PRINT '  PE.Suppliers              : ' + CAST(@@ROWCOUNT as varchar) + ' rows deleted';
+
+-- ===== 2. PE main (giải phóng FK PE.ContractId + PE.BudgetId trước) =====
+DELETE FROM dbo.PurchaseEvaluations;
+PRINT '  PurchaseEvaluations       : ' + CAST(@@ROWCOUNT as varchar) + ' rows deleted';
+
+-- ===== 3. Contract per-type Details =====
+DELETE FROM dbo.ThauPhuDetails;
+DELETE FROM dbo.GiaoKhoanDetails;
+DELETE FROM dbo.NhaCungCapDetails;
+DELETE FROM dbo.DichVuDetails;
+DELETE FROM dbo.MuaBanDetails;
+DELETE FROM dbo.NguyenTacNccDetails;
+DELETE FROM dbo.NguyenTacDvDetails;
+PRINT '  Contract per-type Details : cleaned';
+
+-- ===== 4. Contract child rows =====
+DELETE FROM dbo.ContractDepartmentApprovals;
+DELETE FROM dbo.ContractAttachments;
+DELETE FROM dbo.ContractComments;
+DELETE FROM dbo.ContractChangelogs;
+DELETE FROM dbo.ContractApprovals;
+PRINT '  Contract child rows       : cleaned';
+
+-- ===== 5. Contract main =====
+DELETE FROM dbo.Contracts;
+PRINT '  Contracts                 : ' + CAST(@@ROWCOUNT as varchar) + ' rows deleted';
+
+-- ===== 6. Budget module (PE+Contract đã giải phóng FK BudgetId) =====
+DELETE FROM dbo.BudgetDepartmentApprovals;
+DELETE FROM dbo.BudgetChangelogs;
+DELETE FROM dbo.BudgetApprovals;
+DELETE FROM dbo.BudgetDetails;
+DELETE FROM dbo.Budgets;
+PRINT '  Budgets + children        : cleaned';
+
+-- ===== 7. Code sequences (reset count) =====
+DELETE FROM dbo.PurchaseEvaluationCodeSequences;
+DELETE FROM dbo.ContractCodeSequences;
+PRINT '  Code sequences            : reset';
+
+-- ===== 8. Notifications (dangling refs sau khi xóa phiếu) =====
+DELETE FROM dbo.Notifications;
+PRINT '  Notifications             : ' + CAST(@@ROWCOUNT as varchar) + ' rows deleted';
+
+COMMIT TRANSACTION;
+
+PRINT '';
+PRINT '====================================================';
+PRINT 'Clean transactional data DONE at ' + CONVERT(varchar, GETUTCDATE(), 120) + ' UTC';
+PRINT '====================================================';
+PRINT '';
+PRINT '===== Master KEEP verify =====';
+
+SELECT
+    (SELECT COUNT(*) FROM dbo.Users)              AS Users,
+    (SELECT COUNT(*) FROM dbo.Suppliers)           AS Suppliers,
+    (SELECT COUNT(*) FROM dbo.Projects)            AS Projects,
+    (SELECT COUNT(*) FROM dbo.Departments)         AS Departments,
+    (SELECT COUNT(*) FROM dbo.MaterialItems)       AS Materials,
+    (SELECT COUNT(*) FROM dbo.ServiceItems)        AS Services,
+    (SELECT COUNT(*) FROM dbo.WorkItems)           AS WorkItems,
+    (SELECT COUNT(*) FROM dbo.UnitsOfMeasure)      AS Units;
+
+SELECT
+    (SELECT COUNT(*) FROM dbo.ApprovalWorkflows)        AS Aw_V2,
+    (SELECT COUNT(*) FROM dbo.ApprovalWorkflowSteps)    AS Aw_V2_Steps,
+    (SELECT COUNT(*) FROM dbo.ApprovalWorkflowLevels)   AS Aw_V2_Levels,
+    (SELECT COUNT(*) FROM dbo.WorkflowDefinitions)      AS Wf_V1_Legacy_HD,
+    (SELECT COUNT(*) FROM dbo.PurchaseEvaluationWorkflowDefinitions) AS Wf_V1_Legacy_PE;
+
+SELECT
+    (SELECT COUNT(*) FROM dbo.PurchaseEvaluations)  AS PE_after_clean,
+    (SELECT COUNT(*) FROM dbo.Contracts)             AS Contract_after_clean,
+    (SELECT COUNT(*) FROM dbo.Budgets)               AS Budget_after_clean,
+    (SELECT COUNT(*) FROM dbo.Notifications)         AS Notify_after_clean;