# Schema Diagram — Luồng DB SOLUTION_ERP

> ERD đầy đủ + mối quan hệ 19 table sau Phase 3. Mermaid render ở VS Code / GitHub / Gitea.

## 1. Full ERD

```mermaid
erDiagram
    Users ||--o{ UserRoles : "has"
    Roles ||--o{ UserRoles : "assigned to"
    Users ||--o{ UserClaims : "has"
    Users ||--o{ UserLogins : "has"
    Users ||--o{ UserTokens : "has"
    Roles ||--o{ RoleClaims : "has"

    Roles ||--o{ Permissions : "grants"
    MenuItems ||--o{ Permissions : "controlled by"
    MenuItems ||--o{ MenuItems : "parent-of"

    Suppliers ||--o{ Contracts : "party-B"
    Projects ||--o{ Contracts : "belongs-to"
    Departments ||--o{ Contracts : "drafted-in"
    Users ||--o{ Contracts : "drafter"
    ContractTemplates ||--o{ Contracts : "uses"

    Contracts ||--o{ ContractApprovals : "history"
    Contracts ||--o{ ContractComments : "thread"
    Contracts ||--o{ ContractAttachments : "files"
    Users ||--o{ ContractApprovals : "approved-by"
    Users ||--o{ ContractComments : "author"

    Users {
        uniqueidentifier Id PK
        nvarchar FullName "200"
        nvarchar Email "UK"
        nvarchar PasswordHash
        nvarchar RefreshToken "512"
        datetime2 RefreshTokenExpiresAt
        bit IsActive
        datetime2 CreatedAt
    }

    Roles {
        uniqueidentifier Id PK
        nvarchar Name "UK"
        nvarchar Description "500"
        datetime2 CreatedAt
    }

    MenuItems {
        nvarchar Key PK "50"
        nvarchar Label "200"
        nvarchar ParentKey FK "NULL if root"
        int Order
        nvarchar Icon "50"
    }

    Permissions {
        uniqueidentifier Id PK
        uniqueidentifier RoleId FK
        nvarchar MenuKey FK "50"
        bit CanRead
        bit CanCreate
        bit CanUpdate
        bit CanDelete
    }

    Suppliers {
        uniqueidentifier Id PK
        nvarchar Code "UK 50"
        nvarchar Name "200"
        int Type "NCC/NTP/TD/DVDV/CDT"
        nvarchar TaxCode "20"
        nvarchar Phone "30"
        nvarchar Email "100"
        nvarchar Address "500"
        bit IsDeleted
    }

    Projects {
        uniqueidentifier Id PK
        nvarchar Code "UK 50"
        nvarchar Name "200"
        date StartDate
        date EndDate
        uniqueidentifier ManagerUserId FK
        decimal BudgetTotal "18,2"
    }

    Departments {
        uniqueidentifier Id PK
        nvarchar Code "UK 50"
        nvarchar Name "200"
        uniqueidentifier ManagerUserId FK
    }

    ContractTemplates {
        uniqueidentifier Id PK
        nvarchar FormCode "UK 50"
        nvarchar Name "200"
        int ContractType "nullable"
        nvarchar FileName "255"
        nvarchar StoragePath "500"
        nvarchar Format "docx/xlsx"
        nvarchar FieldSpec "max JSON"
        bit IsActive
    }

    ContractClauses {
        uniqueidentifier Id PK
        nvarchar Code "UK 50"
        nvarchar Name "200"
        nvarchar Content "max rich text"
        int Version
        bit IsActive
    }

    Contracts {
        uniqueidentifier Id PK
        nvarchar MaHopDong "UK filtered 100"
        nvarchar TenHopDong "500"
        int Type "ContractType enum"
        int Phase "9 state"
        uniqueidentifier SupplierId FK
        uniqueidentifier ProjectId FK
        uniqueidentifier DepartmentId FK
        uniqueidentifier DrafterUserId FK
        uniqueidentifier TemplateId FK
        decimal GiaTri "18,2"
        bit BypassProcurementAndCCM
        datetime2 SlaDeadline
        bit SlaWarningSent
        nvarchar DraftData "max JSON"
        bit IsDeleted
    }

    ContractApprovals {
        uniqueidentifier Id PK
        uniqueidentifier ContractId FK
        int FromPhase
        int ToPhase
        uniqueidentifier ApproverUserId FK "NULL=system"
        int Decision "Pending/Approve/Reject/AutoApprove"
        nvarchar Comment "1000"
        datetime2 ApprovedAt
    }

    ContractComments {
        uniqueidentifier Id PK
        uniqueidentifier ContractId FK
        uniqueidentifier UserId FK
        int Phase "phase luc comment"
        nvarchar Content "2000"
        datetime2 CreatedAt
    }

    ContractAttachments {
        uniqueidentifier Id PK
        uniqueidentifier ContractId FK
        nvarchar FileName "255"
        nvarchar StoragePath "500"
        bigint FileSize
        nvarchar ContentType "100"
        int Purpose "DraftExport/ScannedSigned/SealedCopy"
        nvarchar Note "500"
    }

    ContractCodeSequences {
        nvarchar Prefix PK "200"
        int LastSeq
        datetime2 UpdatedAt
    }
```

## 2. Luồng dữ liệu chính (data flow diagram)

```mermaid
flowchart TB
    subgraph IDENTITY ["🔐 Identity domain (seed lần đầu)"]
        U[Users] -->|N-M| R[Roles]
        R --> P[Permissions]
        P --> MI[MenuItems]
    end

    subgraph MASTER ["📋 Master data (admin CRUD)"]
        S[Suppliers]
        PR[Projects]
        DE[Departments]
    end

    subgraph FORMS ["📄 Form templates (seed)"]
        CT[ContractTemplates]
        CC[ContractClauses]
    end

    subgraph CONTRACT ["📝 Contract workflow (Phase 3 core)"]
        C[Contracts]
        CA[ContractApprovals]
        CCM[ContractComments]
        CAT[ContractAttachments]
        CCS[ContractCodeSequences]
    end

    U -.Drafter.-> C
    S --> C
    PR --> C
    DE --> C
    CT --> C
    C --> CA
    C --> CCM
    C --> CAT
    C -.gen when DangDongDau.-> CCS
```

## 3. Vòng đời 1 HĐ — data changes

```mermaid
flowchart LR
    Create[POST /contracts]
    Create --> C1["Contracts INSERT<br/>Phase=2, SLA=+7d"]

    Transition1[Transition 2→3]
    Transition1 --> C2["UPDATE Phase=3<br/>INSERT ContractApprovals"]

    Comment[POST /comments]
    Comment --> C3[INSERT ContractComments]

    Transition2[Transition 3→4→5→6→7]
    Transition2 --> C4["UPDATE Phase + SlaDeadline<br/>INSERT ContractApprovals"]

    Transition3[Transition 7→8 BOD ký]
    Transition3 --> CG["ContractCodeGenerator<br/>SERIALIZABLE tran<br/>UPSERT ContractCodeSequences"]
    CG --> C5["UPDATE Contract<br/>SET MaHopDong='FLOCK 01/HĐGK/SOL&PVL/01',<br/>Phase=8"]

    Transition4[Transition 8→9 HRA phát hành]
    Transition4 --> C6["UPDATE Phase=9, SlaDeadline=NULL<br/>INSERT ContractApprovals"]
```

## 4. Index strategy

| Table | Index | Purpose |
|---|---|---|
| Contracts | `UX_Contracts_MaHopDong` filtered `WHERE [MaHopDong] IS NOT NULL` | Unique mã HĐ |
| Contracts | `IX_Contracts_Phase_IsDeleted` | Inbox query theo phase |
| Contracts | `IX_Contracts_SupplierId` | Filter HĐ theo NCC |
| Contracts | `IX_Contracts_ProjectId` | Filter HĐ theo dự án |
| Contracts | `IX_Contracts_SlaDeadline` | SLA expiry job query |
| ContractApprovals | `IX_ContractApprovals_ContractId_ApprovedAt` | Timeline query theo HĐ |
| ContractComments | `IX_ContractComments_ContractId_CreatedAt` | Thread load |
| ContractAttachments | `IX_ContractAttachments_ContractId` | Attachments load |
| Suppliers/Projects/Departments | `UX_{Table}_Code` | Unique business code |
| Permissions | `UX_Permissions_RoleId_MenuKey` | 1 row / role / menu |
| MenuItems | `IX_MenuItems_ParentKey` | Tree query |

Chi tiết + cheatsheet SQL: [`database-guide.md`](database-guide.md).

## 5. Relationship cardinality

| Parent → Child | Cardinality | OnDelete | Ghi chú |
|---|---|---|---|
| Contract → ContractApproval | 1 - N | Cascade | Xóa HĐ → xóa lịch sử (nhưng mức delete bị chặn sau DangInKy) |
| Contract → ContractComment | 1 - N | Cascade | — |
| Contract → ContractAttachment | 1 - N | Cascade | File vật lý vẫn còn trong `wwwroot/uploads/`, cleanup riêng |
| Supplier → Contract | 1 - N | Restrict | Không xóa Supplier nếu còn HĐ tham chiếu |
| Project → Contract | 1 - N | Restrict | Tương tự |
| Role → Permission | 1 - N | Cascade | Xóa role → clear permissions |
| MenuItem → Permission | 1 - N | Cascade | — |
| MenuItem → MenuItem (self-ref) | 1 - N | Restrict | Parent-child menu |

## 6. Soft delete behavior

Mọi entity extend `AuditableEntity`:
- Delete qua `db.X.Remove(entity)` → `AuditingInterceptor` chuyển `EntityState.Deleted` → `Modified`, set `IsDeleted=true, DeletedAt, DeletedBy`
- Query filter `HasQueryFilter(x => !x.IsDeleted)` tự động filter ra
- Để query bao gồm soft-deleted: `.IgnoreQueryFilters()`

Entity list áp dụng:
- Supplier, Project, Department
- Contract
- ContractTemplate, ContractClause

KHÔNG soft delete (cascade hoặc keep):
- ContractApproval, ContractComment, ContractAttachment — cascade khi Contract xóa
- Permission, MenuItem — cascade khi Role xóa
- ContractCodeSequence — không bao giờ xóa (giữ history seq)
- Identity tables (Users, Roles, ...) — Identity không support soft delete built-in

## 7. Truy vấn tiêu biểu

### Inbox HĐ chờ role của tôi

```sql
-- Tương đương GetMyInboxQuery
SELECT c.Id, c.MaHopDong, c.TenHopDong, c.Phase, c.SlaDeadline, s.Name AS SupplierName, p.Name AS ProjectName
FROM Contracts c
INNER JOIN Suppliers s ON c.SupplierId = s.Id
INNER JOIN Projects  p ON c.ProjectId = p.Id
WHERE c.IsDeleted = 0
  AND c.Phase IN (/* phase eligible cho role hiện tại */)
ORDER BY c.SlaDeadline ASC;
```

### Dashboard stats

```sql
-- Tổng + active + overdue
SELECT
  (SELECT COUNT(*) FROM Contracts WHERE IsDeleted = 0) AS Total,
  (SELECT COUNT(*) FROM Contracts WHERE IsDeleted = 0 AND Phase NOT IN (9, 99)) AS Active,
  (SELECT COUNT(*) FROM Contracts WHERE IsDeleted = 0 AND Phase NOT IN (9, 99) AND SlaDeadline < GETUTCDATE()) AS Overdue;

-- By phase
SELECT Phase, COUNT(*) FROM Contracts WHERE IsDeleted = 0 GROUP BY Phase;

-- Top 5 NCC
SELECT TOP 5 c.SupplierId, s.Name, COUNT(*) AS Cnt, SUM(c.GiaTri) AS TotalValue
FROM Contracts c
INNER JOIN Suppliers s ON c.SupplierId = s.Id
WHERE c.IsDeleted = 0
GROUP BY c.SupplierId, s.Name
ORDER BY COUNT(*) DESC;
```

### Gen mã HĐ atomic

```sql
BEGIN TRAN;
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;

MERGE ContractCodeSequences AS tgt
USING (SELECT @Prefix AS Prefix) AS src ON tgt.Prefix = src.Prefix
WHEN MATCHED THEN UPDATE SET LastSeq = LastSeq + 1, UpdatedAt = GETUTCDATE()
WHEN NOT MATCHED THEN INSERT (Prefix, LastSeq, UpdatedAt) VALUES (@Prefix, 1, GETUTCDATE());

SELECT LastSeq FROM ContractCodeSequences WHERE Prefix = @Prefix;
COMMIT;
```

(EF Core impl dùng `UPDATE + IF ROWCOUNT = 0 INSERT` thay MERGE — tương đương nhưng an toàn hơn với SERIALIZABLE).

## 8. Migration lịch sử

| # | Migration | Tables added |
|---|---|---|
| 1 | `Init` | 7 Identity tables |
| 2 | `AddMasterData` | Suppliers, Projects, Departments |
| 3 | `AddPermissions` | MenuItems, Permissions |
| 4 | `AddForms` | ContractTemplates, ContractClauses |
| 5 | `AddContractsWorkflow` | Contracts, ContractApprovals, ContractComments, ContractAttachments, ContractCodeSequences |

Tổng: **19 bảng** (+ `__EFMigrationsHistory` hệ thống).

## 9. Liên quan

- [`database-guide.md`](database-guide.md) — conventions + migration workflow + cheatsheet đầy đủ
- [`../architecture.md`](../architecture.md) — layered architecture + data flow
- [`../workflow-contract.md`](../workflow-contract.md) — state machine spec
- [`../flows/`](../flows/) — sequence diagrams