# sub-database-agent-1 — Design-review Mig 69 `AddContractSigningPlans` (S161 W1, READ-ONLY advisory)

> Ghi TỪNG MỤC trong lúc làm (chống #53). Không sửa file production. Không commit.
> Nguồn đo: file migration + Designer + ModelSnapshot + 7 EF Configuration + sqlcmd LocalDB Dev/Design.

## VERDICT TỔNG (điền cuối, xem §END)

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## 0. Vật liệu đã đọc (evidence anchors)

| Vật | Đường dẫn | Ghi chú |
|---|---|---|
| Migration | `src/Backend/SolutionErp.Infrastructure/Persistence/Migrations/20260729122015_AddContractSigningPlans.cs` | 373 dòng |
| Designer | `...20260729122015_AddContractSigningPlans.Designer.cs` | 264.515 B |
| Snapshot | `...Migrations/ApplicationDbContextModelSnapshot.cs` | 264.399 B, git diff +550/-0 |
| Config ×7 | `src/Backend/SolutionErp.Infrastructure/Persistence/Configurations/ContractSigningPlan*.cs` | 7 file |
| Spec W1 | `.claude/workflows/runs/2026-07-29-S160-khkk-dryrun-plan/spec-wave-w1-schema-designer-29-07-2026.md:16-20` | §②-2/4/6 |
| Spec gốc maxLength | `.claude/workflows/runs/2026-07-28-S157-ke-hoach-ky-ket-hd/spec-ke-hoach-ky-ket-hd-28-07-2026.md:134-137` | danh sách 11 cột chuỗi |

Đếm operation trong migration (grep + uniq):
- `CreateTable` ×7 · `CreateIndex` ×20 · `DropTable` ×7 (Down)
- `AddColumn` / `AlterColumn` / `DropColumn` / `RenameColumn` / `Sql(` = **0** (không match nào)

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## 3. Đối chứng sqlcmd LocalDB (DB1/DB10 — schema THẬT, không trí nhớ)

`sqlcmd -S "(localdb)\MSSQLLocalDB" -d SolutionErp_Dev -E` :

```
TABLECOUNT|96
CSPTABLE|ContractSigningPlanApprovals
CSPTABLE|ContractSigningPlanAttachments
CSPTABLE|ContractSigningPlanChangelogs
CSPTABLE|ContractSigningPlanDossierItems
CSPTABLE|ContractSigningPlanLevelOpinions
CSPTABLE|ContractSigningPlanLines
CSPTABLE|ContractSigningPlans
MIGTOP|20260729122015_AddContractSigningPlans
MIGCOUNT|69
```

`-d SolutionErp_Design` :
```
DESIGN_TABLECOUNT|96 · DESIGN_CSP|7 · DESIGN_MIGTOP|20260729122015_AddContractSigningPlans · DESIGN_IXCOUNT|27
```

→ **2 DB parity TUYỆT ĐỐI** (96/96 bảng · 7/7 CSP · cùng mig-top · 27 index = 20 IX + 7 PK).
→ **KHÔNG có committed-but-unapplied-local drift** (khác bẫy S53).
→ Acceptance §③-B "sys.tables 89 → 96" = **ĐẠT** (đo được 96; delta +7 khớp 7 CreateTable).

### Index thật trong DB (27 dòng, khớp 1:1 file mig)

Nhóm filtered (soi gotcha #57):
```
ContractSigningPlanLines | IX_..._ContractSigningPlanId_SupplierId | unique=1 | ([IsDeleted]=(0)) | ContractSigningPlanId,SupplierId
ContractSigningPlans     | IX_ContractSigningPlans_MaKeHoach        | unique=1 | ([MaKeHoach] IS NOT NULL) | MaKeHoach
```
Các IX còn lại filter = `-` (không filter), unique=0 trừ `IX_ContractSigningPlanLevelOpinions_ContractSigningPlanId_ApprovalWorkflowLevelId` (unique=1, **không** filter — bàn ở §2e/§4).

### FK thật (8 FK, cột `delete_referential_action_desc`)
```
Approvals    → ContractSigningPlans  CASCADE
Attachments  → ContractSigningPlans  CASCADE
Changelogs   → ContractSigningPlans  CASCADE
DossierItems → ContractSigningPlans  CASCADE
LevelOpinions→ ContractSigningPlans  CASCADE
Lines        → ContractSigningPlans  CASCADE
LevelOpinions→ ApprovalWorkflowLevels NO_ACTION   (= Restrict)
ContractSigningPlans → ApprovalWorkflows NO_ACTION (= Restrict)
```
→ 6 con Cascade 1-hop + 2 Restrict, **đúng y spec §②-2/4**. Zero FK vật lý sang PE/Project/Supplier/User/Contract (loose-Guid, convention Mig 49) — xác nhận bằng chính danh sách 8 FK trên (không có dòng nào trỏ `PurchaseEvaluations`/`Suppliers`/`Projects`).

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