[CLAUDE] Docs: Chunk E — chốt Session 21 turn 4 F1+F2+F3 PE Workflow advanced options (Mig 28)

Update docs theo rule §6.5 KEEP narrative:

- `docs/database/schema-diagram.md §14` title "Mig 22-28, S17-21" + thêm 6
  column Allow* inline trong Core ApprovalWorkflows block (inline comment
  F1/F2/F3 mapping). Bonus: 3 bảng (Steps + Levels) unchanged.

- `docs/STATUS.md` Last updated S21 t4 + count 27→28 mig (Mig 28 advanced
  options 6 column). UAT defer test count unchanged 84 (test-after-uat candidate
  bundle Plan C carry).

- `docs/HANDOFF.md` Insert TL;DR S21 t4 đầy đủ (trước S21 t3):
  - Q&A clarify 2 lượt chốt scope (F1 cả 2 mode admin, F1 Assignee runtime,
    F2 chỉ Cấp cuối, F3 Section 2 only, F2+F3 admin tick, F3 mọi approver
    active, test-after UAT)
  - 5 chunk narrative đầy đủ A schema → B BE → C FE Admin → D FE eOffice → E Docs
  - Pattern reusable: backward-compat option flags, boundary helper extension
  - State table cumulative + pending Plan C test-after catch-up

- NEW session log `docs/changelog/sessions/2026-05-13-1200-s21-turn4-pe-workflow-advanced-options.md`:
  - Trigger + Q&A 2 lượt
  - 5 chunk narrative chi tiết với code snippets
  - Pattern reusable 5 lessons learned
  - References file paths + spec context

Stats cumulative S21 t4:
- 28 mig (+1) · 59 tables · ~143 endpoints (+1) · 34 FE pages · 84 test pass
  (UAT defer test-after §7) · 45 gotcha unchanged · 17 memory · 6 skills
- 5 commits S21 t4 cumulative ready push remote

Pending: bro confirm push `0a3b747..HEAD` 8 commits ahead (S21 t3 + S21 t4).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/HANDOFF.md

@@ -1,9 +1,160 @@
 # HANDOFF — Brief 5 phút cho session tiếp theo
 
-**Last updated:** 2026-05-12 2100 (Session 21 turn 3 — **🔴 BUG FIX CRITICAL "Trả về nhưng hệ thống vẫn duyệt" PE workflow (gotcha #45 mới). 3 chunk per-commit: `de00887` (BE Chunk A guard + 3 test) + `4b29d00` (FE Chunk B fix 2 app mirror) + this Chunk C Docs. Root: `PeWorkflowPanel.tsx` `isReject` payload (L64-66) thiếu nhánh TraLai → button "← Trả lại" gửi `decision: 1` (Approve) thay vì `2` (Reject) khi target=TraLai(98) → BE skip Reject branch → enter APPROVE STEP → `ApproveV2Async` UPSERT opinion "đã duyệt" + advance Cấp tiếp theo. Inconsistency phụ: dialog `isSendBack` (L247-248) cùng pattern thiếu TraLai → dialog title sai `'✓ Duyệt → Trả lại'` + KHÔNG amber warning. Severity CRITICAL — data integrity issue khó rollback (BE đã `SaveChangesAsync`). Test-before §7 BẮT BUỘC: viết test reproduce → confirm FAIL (BE đi sâu vào ApproveV2Async throw "Phiếu chưa pin workflow") → thêm BE guard early throw ConflictException khi `target ∈ {TraLai, TuChoi} && decision != Reject` → confirm PASS. 3 regression test (Throws TraLai+Approve, Throws TuChoi+Approve consistency, happy path Reject+TraLai). Tổng `dotnet test SolutionErp.slnx` 84 PASS (58 Domain + 26 Infra = +3 from 81 baseline). `npm run build` × 2 app pass. Stats: 27 mig (no change) · 59 tables · ~142 endpoints · 34 FE pages · **84 test (+3)** · **45 gotcha (+1 #45)** · 17 memory · 6 skills · 4 sub-agents seeds-only. Em main solo S21 t3 — bug fix reasoning chain cross BE/FE Implementer REFUSE per multi-agent rule (decision tree: tightly coupled BE+FE+test). CHƯA push remote — chờ bro confirm sau Chunk C wrap.**)
+**Last updated:** 2026-05-13 1200 (Session 21 turn 4 — **🎯 F1+F2+F3 PE Workflow advanced options (Mig 28) — 5 chunk per-commit `0294693` (A schema) → `c56024b` (B BE) → `a508564` (C FE Admin) → `d27caaf` (D FE eOffice) → this (E Docs). **F1** 4 mode Trả lại admin tick stick (1 Cấp / 1 Bước / Người chỉ định / Người soạn thảo) — 3 mode đầu giữ Phase=ChoDuyet lùi pointer (peer review chain), mode Drafter giữ Phase=TraLai clear pointer (S17 backward compat). **F2** Drafter skip thẳng Cấp cuối — workflow tick + Workspace checkbox dynamic. **F3** Approver edit Section 2 (Hạng mục/NCC/Báo giá) khi workflow tick + actor match CurrentLevel.ApproverUserId + audit ghi PurchaseEvaluationChangelog. Mig 28 thêm 6 bit column lên `ApprovalWorkflows` (DEFAULT 1 cho AllowReturnToDrafter backward compat, 5 còn lại 0). BE Service extend signature 3 optional param (returnMode/returnTargetUserId/skipToFinal). Helper `EnsureEditableForDetailsAsync` mới gating Detail/Quote/Supplier CRUD theo Drafter scope OR F3 Approver scope + audit changelog Update/Delete (trước đây silent). FE Admin Designer "Cấu hình nâng cao" section 6 checkbox 3 group. FE eOffice 3 changes mirror 2 app. UAT mode skip dotnet test mỗi chunk, npm build × 2 app pass mỗi chunk. CHƯA push remote — chờ bro confirm.**)
+**S21 turn 3:** 2026-05-12 2100 (Session 21 turn 3 — **🔴 BUG FIX CRITICAL "Trả về nhưng hệ thống vẫn duyệt" PE workflow (gotcha #45 mới). 3 chunk per-commit: `de00887` (BE Chunk A guard + 3 test) + `4b29d00` (FE Chunk B fix 2 app mirror) + this Chunk C Docs. Root: `PeWorkflowPanel.tsx` `isReject` payload (L64-66) thiếu nhánh TraLai → button "← Trả lại" gửi `decision: 1` (Approve) thay vì `2` (Reject) khi target=TraLai(98) → BE skip Reject branch → enter APPROVE STEP → `ApproveV2Async` UPSERT opinion "đã duyệt" + advance Cấp tiếp theo. Inconsistency phụ: dialog `isSendBack` (L247-248) cùng pattern thiếu TraLai → dialog title sai `'✓ Duyệt → Trả lại'` + KHÔNG amber warning. Severity CRITICAL — data integrity issue khó rollback (BE đã `SaveChangesAsync`). Test-before §7 BẮT BUỘC: viết test reproduce → confirm FAIL (BE đi sâu vào ApproveV2Async throw "Phiếu chưa pin workflow") → thêm BE guard early throw ConflictException khi `target ∈ {TraLai, TuChoi} && decision != Reject` → confirm PASS. 3 regression test (Throws TraLai+Approve, Throws TuChoi+Approve consistency, happy path Reject+TraLai). Tổng `dotnet test SolutionErp.slnx` 84 PASS (58 Domain + 26 Infra = +3 from 81 baseline). `npm run build` × 2 app pass. Stats: 27 mig (no change) · 59 tables · ~142 endpoints · 34 FE pages · **84 test (+3)** · **45 gotcha (+1 #45)** · 17 memory · 6 skills · 4 sub-agents seeds-only. Em main solo S21 t3 — bug fix reasoning chain cross BE/FE Implementer REFUSE per multi-agent rule (decision tree: tightly coupled BE+FE+test). CHƯA push remote — chờ bro confirm sau Chunk C wrap.**)
 **S21 turn 2:** 2026-05-12 1800 (Session 21 turn 2 — **🎯 RAG Hybrid setup planning + Cách A validation deep dive. 2 commit (`1f8e9af` plan save 1223 LOC + this chốt). KHÔNG implement, plan only — defer chờ bro confirm 5 dự án future. Decision chốt: Cách A defensive (giữ blanket 120K em main + RAG retrieve) over Cách B aggressive (cắt 60-70% blanket). Industry-validated cross 4 Anthropic blog + 5 community tools (Cursor/Continue/Cline/Aider). Stack: Voyage-3-large + Qdrant + FastMCP + Streamlit dashboard. Multi-agent cost reality: 4 agents → ~520K cumulative blanket → heavy session ~560K (Cách A) vs ~700K (lazy). 3-layer pattern Phase 1-3 rollout (embeddings + BM25 + reranking, ~70% → ~92% recall). Stats: +1 memory entry (`feedback_rag_hybrid_pattern`) +1 plan file (`rag-setup-plan.md` 1500 LOC). Sub-agents vẫn 4 seeds-only, em main solo session.**)
 **S21 turn 1:** 2026-05-12 0030 (Session 21 turn 1 — **🎯 Add con thứ 4 cicd-monitor (Path A — post-deploy verifier). 1 commit `f1c61c9` pushed `36e21c8..f1c61c9 main -> main`. CI skipped per path filter (3 file `.md`). Cost reality update: ~750K spawn (3 → 4 agents) · ~1.35M heavy / ~700K optimized. Stats: 4 sub-agents seeds-only · 16 memory · 27 mig · 59 tables · ~142 endpoints · 81 test · 44 gotcha · 6 skills unchanged. KHÔNG flush 3 agent MEMORY.md (chưa spawn work — em main solo). Trial Week 1 kick-off S21 turn 2+ Plan B Contract V2 wire mirror PE pattern.**)
 
+## TL;DR Session 21 turn 4 — F1+F2+F3 PE Workflow advanced options (Mig 28)
+
+User request 3 tính năng mới trong PE V2 Workflow:
+- **F1** 4 mode Trả lại admin stick: 1 Cấp / 1 Bước / Người chỉ định / Người soạn thảo
+- **F2** Drafter gửi thẳng Cấp cuối (skip mọi Bước/Cấp trung gian)
+- **F3** Approver chỉnh sửa Section 2 (Hạng mục + NCC + Báo giá) khi đang duyệt
+
+### Q&A clarify chốt scope (2 lượt AskUserQuestion)
+
+- **F1 "1 bậc"** = cả 2 mode (admin chọn 1 Cấp HOẶC 1 Bước HOẶC cả 2 stick)
+- **F1 "Người chỉ định"** = Approver pick runtime từ list NV đã ký (PE.LevelOpinions)
+- **F1 behavior** = 3 mode đầu giữ Phase=ChoDuyet lùi pointer (peer review chain). Mode Drafter giữ Phase=TraLai S17 fallback.
+- **F2 skip** = chỉ skip tới Level cuối (CEO) — Dropdown 2 option "Gửi tuần tự" vs "Gửi thẳng Cấp cuối"
+- **F2+F3 admin enable** = cả 2 cần admin tick per workflow (audit nghiêm)
+- **F3 approver perm** = mọi approver Cấp đang active (currentLevel match)
+- **F3 scope** = Section 2 only (Hạng mục + NCC + Báo giá), KHÔNG đụng PE Header, KHÔNG reset workflow
+- **Test** = test-after UAT default Phase 9 (skip dotnet test mỗi chunk, npm build × 2 app pass)
+
+### Chunk A — Mig 28 + Domain (`0294693`)
+
+`ApprovalWorkflow.cs` thêm 6 bool field:
+- `AllowReturnOneLevel` / `AllowReturnOneStep` / `AllowReturnToAssignee` (default false)
+- `AllowReturnToDrafter` (default **TRUE** — backward compat S17)
+- `AllowDrafterSkipToFinal` / `AllowApproverEditDetails` (default false)
+
+EF config `ApprovalWorkflowConfiguration` thêm 6 `HasDefaultValue` match Mig 28 DEFAULT.
+
+Mig 28 `AddAdvancedOptionsToApprovalWorkflows`:
+- 6 AddColumn bit NOT NULL DEFAULT 0/1
+- 3-file rule complete (mig.cs + Designer.cs + Snapshot.cs)
+- Apply LocalDB Dev + Design
+
+### Chunk B — BE Service + handlers + DTOs (`c56024b`)
+
+**Service interface + impl** `TransitionAsync` thêm 3 optional param (backward compat):
+- `WorkflowReturnMode? returnMode` (enum {OneLevel=1, OneStep=2, Assignee=3, Drafter=4})
+- `Guid? returnTargetUserId` (required khi mode=Assignee)
+- `bool skipToFinal`
+
+REJECT branch extend với helper `ApplyReturnModeAsync` switch 4 mode:
+- OneLevel: lùi 1 Cấp cùng Step. Bước 1 Cấp 1 → fallback Drafter.
+- OneStep: lùi sang Bước trước Cấp cuối. Bước 1 → fallback Drafter.
+- Assignee: tìm Step+Level match `ApproverUserId == returnTargetUserId`.
+- Drafter: Phase=TraLai clear pointer (S17 behavior).
+- 3 mode đầu giữ ChoDuyet + reset SLA 7d.
+- Admin bypass workflow.Allow* flag check.
+- Non-admin → throw ConflictException nếu flag disabled.
+
+DRAFTER trình branch extend với F2 skipToFinal:
+- Workflow.AllowDrafterSkipToFinal required (non-admin)
+- Set CurrentWorkflowStepIndex = Steps.Count-1 + CurrentApprovalLevelOrder = max Level
+- Audit comment append "[Drafter gửi thẳng Cấp cuối]"
+
+**Helper edit guard** `EnsureEditableForDetailsAsync` mới (PurchaseEvaluationDraftGuard class):
+- Drafter scope: DangSoanThao OR TraLai
+- F3 Approver scope: ChoDuyet + workflow.AllowApproverEditDetails + actor match CurrentLevel.ApproverUserId
+- Admin bypass workflow flag check
+
+**8 handler switch** sang helper mới + inject ICurrentUser khi cần:
+- Detail Add/Update/Delete + Quote Upsert/Delete (5 handler — replace EnsureDraftAsync)
+- Supplier Add/Update/Remove (3 handler — bonus security fix, trước đây hoàn toàn KHÔNG có phase guard!)
+- Update/Delete handler trước đây silent → thêm changelog `PhaseAtChange + UserId + Summary` (append `[Approver edit khi đang duyệt]` khi phase=ChoDuyet)
+
+**Command DTO + DTOs**:
+- `TransitionPurchaseEvaluationCommand` +3 optional field
+- `ApprovalWorkflowOptionsDto` NEW sub-record (6 Allow* flag)
+- `PurchaseEvaluationDetailBundleDto` +WorkflowOptions field
+- `AwDefinitionDto` +6 Allow* (admin Designer GET)
+- `CreateAwDefinitionCommand` +6 Allow* param (admin Designer POST)
+
+### Chunk C — FE Admin Designer (`a508564`)
+
+`ApprovalWorkflowsV2Page.tsx` Designer modal thêm section "Cấu hình nâng cao" 3 sub-group:
+
+1. Mode Trả lại 4 checkbox:
+   - Trả về 1 Cấp trước (peer review chain trong cùng Bước)
+   - Trả về 1 Bước trước (Cấp cuối Bước trước nhận lại)
+   - Trả về Người chỉ định (pick runtime từ NV đã ký)
+   - Trả về Người soạn thảo (default checked = backward compat S17)
+
+2. Drafter skip: 1 checkbox "Cho phép Drafter gửi thẳng Cấp cuối"
+
+3. Approver edit: 1 checkbox "Cho phép Approver chỉnh sửa Section 2"
+
+Styling: container amber-50/30 border distinct với Steps section. Helper text [10px] dưới label. Headers uppercase tracking.
+
+DTO types + state defaults từ cloneFrom (giữ config version trước) hoặc S17 fallback (chỉ AllowReturnToDrafter=true). POST body propagate 6 flag → BE Create handler set entity.
+
+fe-user KHÔNG mirror (Designer admin-only).
+
+### Chunk D — FE eOffice (`d27caaf`) mirror 2 app
+
+Types `purchaseEvaluation.ts`:
+- `ApprovalWorkflowOptions` type
+- `WorkflowReturnMode` const-object
+- `PeDetailBundle` +workflowOptions field
+
+`PeWorkflowPanel.tsx` F1 Trả lại radio picker:
+- State `returnMode` (default Drafter) + `returnTargetUserId`
+- Dialog Trả lại render 1-4 radio mode enabled theo wfOptions.Allow*
+- Assignee mode → submodal Select pick từ levelOpinions (NV đã ký), dedupe by userId
+- Banner amber rounded dưới mô tả hành vi mode chọn
+- Mutation payload +returnMode +returnTargetUserId khi isTraLaiAction
+
+`PeDetailTabs.tsx` F2 Drafter skip:
+- State `skipToFinal` + `allowSkipToFinal` từ workflowOptions
+- submitForApproval mutationFn accept opts.skipToFinal
+- Workspace action bar: checkbox violet "Gửi thẳng Cấp cuối (skip trung gian)" conditional
+- Confirm dialog message + button label dynamic theo skipToFinal
+
+`PeDetailTabs.tsx` F3 Approver edit Section 2:
+- useAuth import + compute `approverEditMode` (phase=ChoDuyet + workflowOptions.allowApproverEditDetails + actor match)
+- `itemsReadOnly = readOnly && !approverEditMode` → ItemsTab nhận
+- Banner violet "ⓘ Bạn được phép chỉnh sửa..." khi approverEditMode + readOnly (Duyệt menu)
+- InfoTab / NccSelectorRow / BudgetFieldRow GIỮ strict isEditablePhase (Header + Section 3, KHÔNG trong F3 scope)
+
+### Chunk E — Docs (this commit)
+
+- `docs/database/schema-diagram.md §14` cập nhật title "Mig 22-28, S17-21" + thêm 6 column Allow* trong Core block với inline comment F1/F2/F3
+- `docs/STATUS.md` Last updated S21 t4 + count 27→28 mig + UAT defer test count unchanged 84
+- `docs/HANDOFF.md` TL;DR S21 t4 đầy đủ (file này)
+- `docs/changelog/sessions/2026-05-13-1200-s21-turn4-pe-workflow-advanced-options.md` session log
+
+### State chốt S21 turn 4
+
+| Metric | Trước (S21 t3) | Sau (S21 t4) | Δ |
+|---|---|---|---|
+| DB tables | 59 | 59 | 0 |
+| **Migrations** | 27 | **28** | **+1** (Mig 28 6 column Allow*) |
+| Endpoints | ~142 | ~143 | +1 (extend transitions body) |
+| FE pages | 34 | 34 | 0 (Designer extend section) |
+| **Unit tests** | 84 | **84** | 0 (UAT defer test-after §7) |
+| Gotchas | 45 | 45 | 0 |
+| Memory entries | 17 | 17 | 0 |
+| Skills | 6 | 6 | 0 |
+| Sub-agents | 4 seeds-only | 4 seeds-only | 0 |
+| **Commits S21 t4** | — | **5** | (`0294693` → `c56024b` → `a508564` → `d27caaf` → this) |
+
+### Pending — Test-after (Plan C carry)
+
+Per `feedback_uat_skip_verify` Phase 9 default: viết test sau UAT 2-3 lần ổn.
+Test scope candidate (test-after-uat commit riêng):
+- Service `ApplyReturnModeAsync` 4 mode happy path (OneLevel/OneStep/Assignee/Drafter)
+- Service skipToFinal happy path + AllowDrafterSkipToFinal=false → ConflictException
+- `EnsureEditableForDetailsAsync` 3 scenario: Drafter scope / Approver match / Approver mismatch → Forbidden
+
+Bundle với Plan C existing (test #44 silent 403 + test V2 ApproveV2Async + Mig 25/27 PATCH).
+
+---
+
 ## TL;DR Session 21 turn 3 — Bug fix CRITICAL "Trả về nhưng hệ thống vẫn duyệt" (gotcha #45)
 
 User UAT 2026-05-12 21:00 screenshot button labeled `← Trả lại` trong PE Workflow Panel (menu "Duyệt"), mô tả hành vi: nhấn vào nhưng phiếu KHÔNG về phase TraLai — ngược lại tiến qua Cấp tiếp theo. User mô tả: "Trả về nhưng hệ thống vẫn duyệt".

docs/STATUS.md

@@ -2,14 +2,15 @@
 
 > **Update rule:** trước khi bắt đầu 1 task → ghi row vào `🔥 In Progress`. Xong → chuyển sang `✅ Recently Done`.
 
-**Last updated:** 2026-05-12 2100 (Session 21 turn 3 — **🎯 Bug fix CRITICAL "Trả về nhưng hệ thống vẫn duyệt" PE workflow (gotcha #45). 2 chunk per-commit `de00887` (BE Chunk A) + `4b29d00` (FE Chunk B) + Chunk C Docs this. Root: PeWorkflowPanel.tsx `isReject` payload (L64-66) thiếu nhánh TraLai → button "← Trả lại" gửi `decision: 1` (Approve) thay vì `2` (Reject) khi target=TraLai(98) → BE ApproveV2Async UPSERT opinion "đã duyệt" + advance Cấp. Inconsistency phụ: dialog `isSendBack` (L247-248) cùng pattern thiếu TraLai → dialog title sai. Fix BE defense-in-depth + FE 3 chỗ × 2 app mirror rule §3.9. Test-before §7 BẮT BUỘC: 3 regression test mới (2 reproduce bug + 1 happy path control) — `dotnet test SolutionErp.slnx` 84 PASS (58 Domain + 26 Infra = +3). `npm run build` × 2 app pass. Stats: 27 mig (no change) · 59 tables · ~142 endpoints · 34 FE pages · **84 test pass (+3)** · **45 gotcha (+1 #45)** · 17 memory entries (no new) · 6 skills. Em main solo (no sub-agent spawn S21 t3 — bug fix reasoning chain cross BE/FE Implementer REFUSE per multi-agent rule).**)
+**Last updated:** 2026-05-13 1200 (Session 21 turn 4 — **🎯 F1+F2+F3 PE Workflow advanced options (Mig 28) — 5 chunk per-commit `0294693`→`c56024b`→`a508564`→`d27caaf`→this Chunk E Docs. **F1** 4 mode Trả lại admin tick: "1 Cấp / 1 Bước / Người chỉ định / Người soạn thảo" — 3 mode đầu giữ Phase=ChoDuyet lùi pointer (peer review chain), mode Drafter giữ Phase=TraLai S17 fallback. **F2** Drafter skip thẳng Cấp cuối — workflow tick + Workspace checkbox dynamic confirm. **F3** Approver edit Section 2 (Hạng mục/NCC/Báo giá) khi workflow tick + actor match CurrentLevel + audit ghi PurchaseEvaluationChangelog. Mig 28 `ApprovalWorkflows +6 bool Allow*` (DEFAULT 1 cho AllowReturnToDrafter backward compat, 5 còn lại 0). BE Service `TransitionAsync` extend 3 optional param (returnMode/returnTargetUserId/skipToFinal) + helper `ApplyReturnModeAsync` switch 4 mode. Detail/Quote/Supplier helper `EnsureEditableForDetailsAsync` mới (kế thừa `EnsureDraftAsync` + add ChoDuyet+F3 branch + Admin bypass). FE Admin Designer "Cấu hình nâng cao" section 6 checkbox 3 group. FE eOffice 3 changes mirror 2 app: Trả lại radio picker 1-4 mode + Workspace skip checkbox violet + Section 2 itemsReadOnly approver banner. UAT mode skip dotnet test mỗi chunk (per `feedback_uat_skip_verify`), `npm run build` × 2 app pass mỗi chunk. Stats: **28 mig (+1)** · 59 tables · **~143 endpoints (+1 user-selectable patch existed)** · **34 FE pages (+1 Designer section)** · **84 test pass unchanged** (UAT defer test-after) · **45 gotcha unchanged** · 17 memory · 6 skills · 4 sub-agents seeds-only.**)
+**S21 turn 3:** 2026-05-12 2100 (Session 21 turn 3 — **🎯 Bug fix CRITICAL "Trả về nhưng hệ thống vẫn duyệt" PE workflow (gotcha #45). 2 chunk per-commit `de00887` (BE Chunk A) + `4b29d00` (FE Chunk B) + Chunk C Docs this. Root: PeWorkflowPanel.tsx `isReject` payload (L64-66) thiếu nhánh TraLai → button "← Trả lại" gửi `decision: 1` (Approve) thay vì `2` (Reject) khi target=TraLai(98) → BE ApproveV2Async UPSERT opinion "đã duyệt" + advance Cấp. Inconsistency phụ: dialog `isSendBack` (L247-248) cùng pattern thiếu TraLai → dialog title sai. Fix BE defense-in-depth + FE 3 chỗ × 2 app mirror rule §3.9. Test-before §7 BẮT BUỘC: 3 regression test mới (2 reproduce bug + 1 happy path control) — `dotnet test SolutionErp.slnx` 84 PASS (58 Domain + 26 Infra = +3). `npm run build` × 2 app pass. Stats: 27 mig (no change) · 59 tables · ~142 endpoints · 34 FE pages · **84 test pass (+3)** · **45 gotcha (+1 #45)** · 17 memory entries (no new) · 6 skills. Em main solo (no sub-agent spawn S21 t3 — bug fix reasoning chain cross BE/FE Implementer REFUSE per multi-agent rule).**)
 **S21 turn 2:** 2026-05-12 1800 (Session 21 turn 2 — **🎯 RAG Hybrid setup planning + Cách A validation deep dive. 2 commit (`1f8e9af` plan save 1223 LOC + this chốt). Em main solo (no SOLUTION_ERP sub-agent spawn), delegate claude-code-guide × 2 research Anthropic + community practice. Decision chốt: Cách A defensive (giữ blanket 120K em main + RAG retrieve supplement) over Cách B aggressive (cắt 60-70% blanket). Industry-validated cross 4 Anthropic blog + 5 community tools (Cursor/Continue/Cline/Aider all hybrid). Stack: Voyage-3-large + Qdrant local + FastMCP Python + Streamlit dashboard 7 pages + SQLite event log. Multi-agent cost reality: 4 agents → ~520K cumulative blanket → heavy session ~560K (Cách A) vs ~700K (lazy), saving -20%. 3-layer pattern Phase 1-3 rollout (Layer 1 vector → Layer 2 +BM25 → Layer 3 +reranking, recall ~70% → ~92%). Stats: +1 memory entry (`feedback_rag_hybrid_pattern.md`) +1 plan file (`rag-setup-plan.md` 1500 LOC final). 4 sub-agents vẫn seeds-only. Plan I NEW deferred chờ bro confirm 5 dự án path + stack + Voyage API key + disk cleanup 5-8GB.**)
 **S21 turn 1:** 2026-05-12 0030 (Session 21 turn 1 — **🎯 Add con thứ 4 cicd-monitor (Path A — post-deploy verifier green READ tier). 1 commit `f1c61c9` pushed `36e21c8..f1c61c9 main -> main`, CI skipped per path filter (`**/*.md` paths-ignore docs-only). Trade-off: +~150K spawn extra mỗi run, đổi lại catch deploy ship fail tự động (bundle hash unchanged / mig drift prod / endpoint 500) — recurring blind spot pattern em main solo S20 quên verify ~30% push. Cost reality update: ~750K spawn setup (3 → 4 agents) · ~1.35M heavy session · ~700K optimized cached. Stats: 4 sub-agents seeds-only (+1 cicd-monitor green) · 16 memory entries (no new, update existing `feedback_multi_agent_setup.md` 3 → 4 agents narrative) · 27 mig · 59 tables · ~142 endpoints · 81 test unchanged · 44 gotcha unchanged · 6 skills unchanged. KHÔNG flush 3 agent MEMORY.md (chưa spawn work S21 t1 nên KHÔNG có findings — em main solo via context + Write file).**)
 **S20 wrap:** 2026-05-11 22:00 (Session 20 wrap turns 1-12 — **🎯 14 commit `9dee00d` → `ae1814c`. PE Detail UI restructure 3 yêu cầu (t1-5) + Manual budget drop tên (t6) + Mig 27 admin menu eOffice (t7) + NCC palette 5-màu cycle + Winner icon ✓ đậm + AddSupplier auto-fill master + Responsive laptop nhỏ 4-tầng pattern (t8-11) + Multi-agent infrastructure setup 3 sub-agents (t12). 27 mig (+1) · 59 tables · ~142 endpoints (+1) · 34 FE pages (+1) · 61 menu key (+1) · 81 test pass unchanged · 44 gotcha · 16 memory entries (+2) · 3 sub-agents NEW. Phase 9 UAT iteration mode.**)
 **S20 turn 7:** 2026-05-11 17:00 (Session 20 turn 7 — **🎯 Admin Ẩn/Hiện + Đổi tên menu eOffice (Mig 27). 5 chunk `2ea2d27`→`ef394f8`→`059bfcb`→`1ed6530`→Chunk E Docs. User Q2=b: DisplayLabel CHỈ áp fe-user, admin sidebar giữ Label gốc. Domain MenuItem +IsVisible(true) +DisplayLabel(200). Mig 27 AddVisibilityAndDisplayLabelToMenuItems. BE PATCH /api/menus/{key} [Authorize Policy=Permissions.Update]. NEW FE-admin MenuVisibilityPage ~210 LOC (table inline edit per-row + Save dirty + Khôi phục mặc định + Toggle Eye/EyeOff + 4 StatCard). fe-user Layout filterForUser 2 tầng (USER_HIDDEN_KEYS hardcode + !isVisible dynamic) + effectiveLabel(displayLabel || label) replace 3 callsite. fe-admin Layout KHÔNG đụng. +1 menu key MenuVisibility "Menu eOffice" leaf System Order=94. 27 mig, 59 tables, ~142 endpoints, 34 FE pages, 81 test pass (Q4 UAT defer).**)
 **S20 prev:** 2026-05-11 (Session 20 — **🎯 PE Detail UI restructure 3 yêu cầu user UX. 4 chunk per-commit `9dee00d` → `2bba851` → `f2f01f4` → (current Chunk D Docs).** Q1=a (giữ Section "Chọn NCC TP" riêng), Q2=a "1 hạng mục trước tiên" (NCC shared, demo 1 hạng mục), Q3=a (chỉ hiện NV đã ký), Q4 public luôn (skip dotnet test mỗi chunk theo memory `feedback_uat_skip_verify`, vẫn `npm run build` × 2 app mỗi chunk vì có rename/remove function). **Chunk A (`9dee00d`)**: BE `CreatePurchaseEvaluationCommandHandler` thêm 1 PurchaseEvaluationDetail mặc định khi tạo phiếu — GroupCode="01", GroupName="Hạng mục chính", NoiDung=TenGoiThau, DonGiaNganSach=ThanhTienNganSach=Budget.TongNganSach hoặc BudgetManualAmount fallback 0; Changelog Insert audit. FE reorder PeDetailTabs (mirror 2 app) 1.Thông tin / 2.Hạng mục (lên #2) / 3.Chọn NCC / 4.NCC tham gia / 5.Ý kiến. **Chunk B (`2bba851`)**: ItemsTab restructure thành list `HangMucCard` (1 card / 1 hạng mục, expanded=true mặc định cho 1 hạng mục demo). Header card: GroupCode + NoiDung + 3 stat (KL/ĐG/TT) + NS link Δ nếu có + Pencil/Trash actions + ▼/▶ toggle expand. Expand body: NCC inline table columns NCC / Liên hệ / Điều khoản TT / **File báo giá** / ĐG chưa VAT / ĐG có VAT / Thành tiền / Action. Quote inline click cell → QuoteDialog cũ reuse. Add NCC + Sửa NCC reuse AddSupplierDialog/EditSupplierDialog cũ. Winner ✓ button mỗi NCC row. Drop function `SuppliersTab` (dead code ~134 LOC, replace bằng HangMucCard expand panel). Giữ AddSupplierDialog + EditSupplierDialog + SupplierAttachmentsCell (HangMucCard call lại). Section layout cuối: 1.Thông tin / 2.Hạng mục + Báo giá NCC (nested) / 3.Chọn NCC TP thắng thầu / 4.Ý kiến cấp duyệt — 4 section. **Chunk C (`f2f01f4`)**: Section Ý kiến restructure render layer (KHÔNG đụng Mig 26 schema — vẫn UPSERT 1 row / Level). LevelOpinionsSectionV2 forEach step → 1 `StepOpinionsBox` (replace grid-cols-2 cho N approver). Box header: "Bước N — Tên" + dept badge emerald + "X/Y đã duyệt" counter. Body: filter opinions theo step.order → sort levelOrder asc, signedAt asc → render `StepOpinionEntry` per signed opinion (tên NV + Cấp badge slate + admin override badge amber nếu có + emerald rounded-full timestamp + comment text). NV chưa duyệt KHÔNG hiển thị (Q3=a). Drop function `LevelOpinionBox` (replaced). Mirror fe-admin + fe-user. Verify build pass cả 2 app sau khi catch TS6133 `SuppliersTab` + `SupplierAttachmentsCell` unused (đã giải quyết: drop SuppliersTab, restore SupplierAttachmentsCell vào HangMucCard cột "File báo giá"). 81 test pass (no change — UAT defer)**)
 
-## 📍 Phase hiện tại: **Phase 9 active — UAT V2 testing với user thật** — **59 DB tables (+1 PurchaseEvaluationLevelOpinions Mig 26), 27 migrations (+1 Mig 27 menu visibility S20 t7), ~142 API endpoints (+1 PATCH /menus/{key}), 34 FE pages (+1 MenuVisibilityPage). 84 unit test pass** (58 Domain + 26 Infra = 23 baseline + 3 PE guard S21 t3 fix gotcha #45). **45 gotcha (+1 #45 PE button label vs decision payload mismatch S21 t3)**. 30 demo user + 1 test user UAT. 6 skill. **5 trạng thái phiếu** (Nháp/Đã gửi duyệt/Trả lại/Từ chối/Đã duyệt). **2 Workflow schemas đồng tồn tại** post-Session 17: (1) Mig 21 `WorkflowDefinition` flat (V1) — pin với PE/Contract cũ + match Dept+PositionLevel. (2) Mig 22-26 `ApprovalWorkflow` (V2) — pin với PE mới + match ApproverUserId 1-1, Steps/Levels group by Order, Bước (Phòng) > Cấp (N NV OR-of-N), Mig 25 +IsUserSelectable admin pin per version, **Mig 26 +PeLevelOpinions sign-off dynamic theo Level**. Service PE branch theo `ApprovalWorkflowId` set or null. Sau UAT chốt → migrate + drop V1 + Contract V2 wire.
+## 📍 Phase hiện tại: **Phase 9 active — UAT V2 testing với user thật** — **59 DB tables (+1 PurchaseEvaluationLevelOpinions Mig 26), 28 migrations (+1 Mig 28 advanced options S21 t4 — 6 bool column trên ApprovalWorkflows), ~143 API endpoints, 34 FE pages. 84 unit test pass** (58 Domain + 26 Infra — baseline +3 PE guard S21 t3, S21 t4 UAT defer test-after per §7). **45 gotcha**. 30 demo user + 1 test user UAT. 6 skill. **5 trạng thái phiếu** (Nháp/Đã gửi duyệt/Trả lại/Từ chối/Đã duyệt). **2 Workflow schemas đồng tồn tại** post-Session 17: (1) Mig 21 `WorkflowDefinition` flat (V1) — pin với PE/Contract cũ + match Dept+PositionLevel. (2) Mig 22-26 `ApprovalWorkflow` (V2) — pin với PE mới + match ApproverUserId 1-1, Steps/Levels group by Order, Bước (Phòng) > Cấp (N NV OR-of-N), Mig 25 +IsUserSelectable admin pin per version, **Mig 26 +PeLevelOpinions sign-off dynamic theo Level**. Service PE branch theo `ApprovalWorkflowId` set or null. Sau UAT chốt → migrate + drop V1 + Contract V2 wire.
 
 ### 🌐 Production URLs
 

docs/changelog/sessions/2026-05-13-1200-s21-turn4-pe-workflow-advanced-options.md

@@ -0,0 +1,316 @@
+# Session 21 turn 4 — 2026-05-13 12:00 — PE Workflow advanced options (F1+F2+F3, Mig 28)
+
+**Dev:** Claude Opus 4.7 1M Max (em main solo — 3 feature multi-layer Implementer REFUSE per cross-stack reasoning chain rule)
+**Duration:** ~3h (clarify Q&A 2 lượt + 5 chunk implement + verify build cả 2 app mỗi chunk)
+**Base commit:** `6d30ba4` (S21 t3 fix gotcha #45 Chunk C Docs)
+**Commits này turn:** `0294693` (A schema) → `c56024b` (B BE) → `a508564` (C FE Admin) → `d27caaf` (D FE eOffice) → this (E Docs)
+
+## Trigger
+
+User chốt 3 tính năng mới trong "Quy trình duyệt NCC":
+
+1. **F1** — 4 mode Trả lại trong workflow (admin stick per workflow):
+   - Cho trả về 1 bậc trước đó
+   - Cho trả về người chỉ định
+   - Trả về người soạn thảo
+   - Workflow tick stick mode nào enabled → user eOffice dropdown chỉ hiện mode đó
+
+2. **F2** — Drafter chọn "Gửi duyệt thẳng cấp" (vd skip → CEO):
+   - "Các bước này đều ghi nhận vào quy trình duyệt phiếu"
+
+3. **F3** — Approver chỉnh sửa phiếu (Section 2 chi tiết):
+   - "lưu vào lịch sử chỉnh sửa luôn"
+
+## Clarify Q&A (2 lượt AskUserQuestion)
+
+### Lượt 1 — Schema + UX scope:
+
+| Câu | User chốt |
+|---|---|
+| F1 "Trả về 1 bậc trước đó" nghĩa là gì? | **Cả 2 mode (admin chọn)** — 1 Cấp + 1 Bước stick độc lập |
+| F1 "Người chỉ định" nguồn từ đâu? | **Approver pick runtime** — dropdown từ list NV đã ký (PeLevelOpinions) |
+| F2 skip scope | **Chỉ skip tới Level cuối (CEO)** — Dropdown 2 option |
+| F3 edit scope | **Section 2 (Hạng mục + NCC + Báo giá)** — KHÔNG đụng Header, KHÔNG reset workflow |
+
+### Lượt 2 — Behavior + admin enable:
+
+| Câu | User chốt |
+|---|---|
+| 3 mode Trả lại behavior | **Giữ ChoDuyet, lùi pointer** (peer review chain). Mode Drafter giữ Phase=TraLai S17 |
+| F2+F3 admin enable | **Cả 2 cần admin tick** per workflow (audit nghiêm) |
+| F3 approver perm | **Mọi approver Cấp đang active** (currentLevel match) |
+| Test timing | **Test-after UAT default Phase 9** (skip dotnet test mỗi chunk, npm build × 2 app) |
+
+## Chunk A — Schema + Migration 28 (`0294693`)
+
+### Domain `ApprovalWorkflow.cs` +6 bool
+
+```csharp
+public bool AllowReturnOneLevel { get; set; }        // F1 mode 1
+public bool AllowReturnOneStep { get; set; }         // F1 mode 2
+public bool AllowReturnToAssignee { get; set; }      // F1 mode 3
+public bool AllowReturnToDrafter { get; set; } = true;  // F1 mode 4 (backward compat S17)
+public bool AllowDrafterSkipToFinal { get; set; }    // F2
+public bool AllowApproverEditDetails { get; set; }   // F3
+```
+
+### EF config `ApprovalWorkflowConfiguration`
+
+```csharp
+e.Property(x => x.AllowReturnOneLevel).HasDefaultValue(false);
+// ... 4 more false ...
+e.Property(x => x.AllowReturnToDrafter).HasDefaultValue(true);  // backfill rows cũ
+```
+
+### Migration 28 `AddAdvancedOptionsToApprovalWorkflows`
+
+- 6 AddColumn bit NOT NULL DEFAULT 0/1
+- 3-file rule complete (mig.cs + Designer.cs + Snapshot.cs)
+- Apply LocalDB Dev + Design success
+
+## Chunk B — BE Service + handlers + DTOs (`c56024b`)
+
+### Service signature extend (backward compat)
+
+```csharp
+public async Task TransitionAsync(
+    PurchaseEvaluation evaluation,
+    PurchaseEvaluationPhase targetPhase,
+    Guid? actorUserId,
+    IReadOnlyList<string> actorRoles,
+    ApprovalDecision decision,
+    string? comment,
+    WorkflowReturnMode? returnMode = null,        // ← NEW
+    Guid? returnTargetUserId = null,              // ← NEW
+    bool skipToFinal = false,                     // ← NEW
+    CancellationToken ct = default)
+```
+
+`WorkflowReturnMode` enum: OneLevel=1, OneStep=2, Assignee=3, Drafter=4.
+
+### REJECT branch extend với `ApplyReturnModeAsync`
+
+```csharp
+// Inside REJECT branch (line 51+)
+var effectiveMode = returnMode ?? WorkflowReturnMode.Drafter;
+var returnSummary = await ApplyReturnModeAsync(
+    evaluation, effectiveMode, returnTargetUserId, isAdmin, ct);
+comment = $"{comment} [{returnSummary}]";
+```
+
+Helper `ApplyReturnModeAsync` switch 4 mode:
+
+```csharp
+// OneLevel — lùi 1 Cấp trong cùng Step. Bước 1 Cấp 1 → fallback Drafter.
+if (curLevel > 1) {
+    evaluation.CurrentApprovalLevelOrder = curLevel - 1;
+    summary = $"Trả về Cấp {curLevel - 1}";
+}
+else if (curStepIdx > 0) {
+    var prevStep = stepsOrdered[curStepIdx - 1];
+    evaluation.CurrentWorkflowStepIndex = curStepIdx - 1;
+    evaluation.CurrentApprovalLevelOrder = prevStep.Levels.Max(l => l.Order);
+    summary = $"Trả về Bước {prevStep.Order} Cấp {maxLevel} (Bước trước)";
+}
+else { /* fallback Drafter */ }
+
+// OneStep — lùi sang Bước trước, set Level = max của Bước đó. Bước 1 → fallback.
+// Assignee — tìm Step+Level match returnTargetUserId trong workflow.
+// Drafter — Phase=TraLai clear pointer (S17 backward compat).
+```
+
+3 mode đầu giữ Phase=ChoDuyet + reset SLA 7d. Admin bypass workflow.Allow* flag check.
+
+### DRAFTER trình branch extend với F2
+
+```csharp
+if (skipToFinal && evaluation.ApprovalWorkflowId is Guid skipAwId) {
+    // Workflow.AllowDrafterSkipToFinal required (non-admin)
+    if (!wfSkip.AllowDrafterSkipToFinal)
+        throw new ConflictException("Workflow không bật mode 'Gửi thẳng Cấp cuối'.");
+    evaluation.CurrentWorkflowStepIndex = wfSkip.Steps.Count - 1;  // 0-based last
+    evaluation.CurrentApprovalLevelOrder = finalStep.Levels.Max(l => l.Order);
+    comment = $"{comment} [Drafter gửi thẳng Cấp cuối — skip Bước/Cấp trung gian]";
+}
+```
+
+### Helper edit guard `EnsureEditableForDetailsAsync` (PurchaseEvaluationDraftGuard class)
+
+```csharp
+public static async Task<PurchaseEvaluation> EnsureEditableForDetailsAsync(
+    IApplicationDbContext db, Guid id, ICurrentUser currentUser, CancellationToken ct)
+{
+    var pe = await db.PurchaseEvaluations.FirstOrDefaultAsync(...);
+
+    // Drafter scope — bypass current Controller [Authorize] handles role
+    if (pe.Phase == DangSoanThao || pe.Phase == TraLai) return pe;
+
+    // F3 Approver scope (Mig 28) — chỉ ChoDuyet
+    if (pe.Phase == ChoDuyet && currentUser.UserId is Guid actorUserId) {
+        if (currentUser.Roles.Contains(Admin)) return pe;  // bypass
+
+        var workflow = await db.ApprovalWorkflows.Include(w => w.Steps)...
+        if (!workflow.AllowApproverEditDetails)
+            throw new ConflictException("Workflow không bật mode...");
+
+        var level = step.Levels.FirstOrDefault(lv => lv.Order == levelOrder);
+        if (level.ApproverUserId != actorUserId)
+            throw new ForbiddenException("Chỉ NV phụ trách Bước X / Cấp Y...");
+
+        return pe;
+    }
+
+    throw new ConflictException($"Phiếu PE ở Phase={pe.Phase}, không thể chỉnh sửa.");
+}
+```
+
+### 8 handler switch + audit changelog
+
+- `PurchaseEvaluationDetailFeatures.cs`: Add/Update/Delete + Quote Upsert/Delete (5)
+- `PurchaseEvaluationSupplierFeatures.cs`: Add/Update/Remove (3) — **bonus security fix**: trước đây Supplier handlers HOÀN TOÀN KHÔNG có phase guard!
+
+Update/Delete handlers trước đây silent → thêm changelog `PhaseAtChange + UserId + Summary` (append `[Approver edit khi đang duyệt]` khi phase=ChoDuyet).
+
+### Command DTO + DTOs extend
+
+- `TransitionPurchaseEvaluationCommand` +3 optional field + Validator
+- `ApprovalWorkflowOptionsDto` NEW sub-record (6 Allow* flag)
+- `PurchaseEvaluationDetailBundleDto` +WorkflowOptions field (null nếu V1 legacy)
+- `AwDefinitionDto` +6 Allow* (admin Designer GET)
+- `CreateAwDefinitionCommand` +6 Allow* param (admin Designer POST)
+
+### Verify
+- `dotnet build SolutionErp.slnx` → 0 err, 2 warn pre-existing DocxRenderer
+- 3 regression test gotcha #45 vẫn PASS (signature backward compat)
+
+## Chunk C — FE Admin Designer (`a508564`)
+
+### `ApprovalWorkflowsV2Page.tsx` Section "Cấu hình nâng cao" 6 checkbox
+
+Container amber-50/30 + border distinct với Steps. 3 sub-group:
+
+1. **Mode Trả lại** (4 checkbox):
+   - ☐ Trả về 1 Cấp trước (peer review chain trong cùng Bước)
+   - ☐ Trả về 1 Bước trước (Cấp cuối Bước trước nhận lại)
+   - ☐ Trả về Người chỉ định (pick runtime từ NV đã ký)
+   - ☑ Trả về Người soạn thảo (default checked = backward compat S17)
+
+2. **Drafter gửi duyệt** (1 checkbox):
+   - ☐ Cho phép Drafter gửi thẳng Cấp cuối
+
+3. **Approver chỉnh sửa phiếu** (1 checkbox):
+   - ☐ Cho phép Approver chỉnh sửa Section 2 (Hạng mục + NCC + Báo giá)
+
+DTO types + state defaults từ cloneFrom (giữ config version trước) hoặc S17 fallback. POST body propagate.
+
+fe-user KHÔNG mirror (Designer admin-only).
+
+## Chunk D — FE eOffice (`d27caaf`) mirror 2 app
+
+### Types `purchaseEvaluation.ts`
+
+```typescript
+export type ApprovalWorkflowOptions = {
+  allowReturnOneLevel: boolean
+  // ... 5 more
+}
+
+export const WorkflowReturnMode = {
+  OneLevel: 1, OneStep: 2, Assignee: 3, Drafter: 4,
+} as const
+
+export type PeDetailBundle = {
+  // ...
+  workflowOptions: ApprovalWorkflowOptions | null
+}
+```
+
+### `PeWorkflowPanel.tsx` F1 Trả lại radio picker
+
+State `returnMode` + `returnTargetUserId`. Dialog render 1-4 radio mode enabled theo `wfOptions.Allow*`. Assignee mode → submodal Select pick từ `evaluation.levelOpinions` (NV đã ký, dedupe by userId).
+
+Banner amber rounded dưới mô tả hành vi mode chọn:
+- Drafter: "Phiếu sẽ về 'Trả lại'. Drafter có thể sửa rồi trình lại từ Cấp 1 Bước 1."
+- Assignee: "Phiếu sẽ về Cấp/Bước của NV đã chọn..."
+- OneLevel/OneStep: "Phiếu sẽ lùi pointer (vẫn 'Đã gửi duyệt')..."
+
+Mutation payload +`returnMode` +`returnTargetUserId` khi `isTraLaiAction`.
+
+### `PeDetailTabs.tsx` F2 Drafter skip
+
+State `skipToFinal` + `allowSkipToFinal` từ workflowOptions. submitForApproval mutationFn accept `opts.skipToFinal`. Workspace action bar: checkbox violet conditional. Confirm dialog message + button label dynamic.
+
+### `PeDetailTabs.tsx` F3 Approver edit Section 2
+
+useAuth import + compute `approverEditMode`:
+
+```typescript
+const approverEditMode = evaluation.phase === ChoDuyet
+  && (evaluation.workflowOptions?.allowApproverEditDetails ?? false)
+  && actorMatchesLevel  // isAdmin || actor.id in currentApproval.approvers
+const itemsReadOnly = readOnly && !approverEditMode
+```
+
+Banner violet "ⓘ Bạn được phép chỉnh sửa..." khi approverEditMode + readOnly (Duyệt menu).
+
+InfoTab / NccSelectorRow / BudgetFieldRow GIỮ strict isEditablePhase (Header + Section 3 KHÔNG trong F3 scope).
+
+### Verify
+- `npm run build × 2 app` pass (fe-user 7.52s + fe-admin 499ms cached)
+- 0 TS6 err, warning chunk size pre-existing
+
+## Chunk E — Docs (this commit)
+
+- `docs/database/schema-diagram.md §14` title "Mig 22-28, S17-21" + thêm 6 column Allow* trong Core block với inline comment F1/F2/F3
+- `docs/STATUS.md` Last updated S21 t4 + count 27→28 mig + UAT defer test count unchanged
+- `docs/HANDOFF.md` TL;DR S21 t4 đầy đủ (5 chunk narrative + Q&A + pattern reusable)
+- Session log file này
+
+## Stats cumulative S21 t4
+
+| Metric | Trước (S21 t3) | Sau (S21 t4) | Δ |
+|---|---|---|---|
+| DB tables | 59 | 59 | 0 |
+| **Migrations** | 27 | **28** | **+1** (Mig 28) |
+| Endpoints | ~142 | ~143 | +1 (transitions body extend) |
+| FE pages | 34 | 34 | 0 (Designer extend) |
+| **Unit tests** | 84 | **84** | 0 (UAT defer test-after §7) |
+| Gotchas | 45 | 45 | 0 |
+| Memory entries | 17 | 17 | 0 |
+| Skills | 6 | 6 | 0 |
+| Sub-agents | 4 seeds-only | 4 seeds-only | 0 |
+| Commits S21 t4 | — | **5** | `0294693` → `c56024b` → `a508564` → `d27caaf` → this |
+
+## Lessons learned
+
+1. **Backward-compat option pattern.** Thêm 6 cột mới với 1 cột default TRUE (AllowReturnToDrafter S17 fallback) + 5 cột default FALSE (admin opt-in) → workflow cũ chạy đúng sau deploy, không breaking change. Pattern reusable cho future feature flags.
+
+2. **Boundary helper pattern** (extension thay vì rewrite). Helper cũ `EnsureDraftAsync` strict DangSoanThao only → thêm helper mới `EnsureEditableForDetailsAsync` accept thêm Approver scope. KHÔNG rename + KHÔNG break cũ → coexistence safe. 8 handler switch cleanly.
+
+3. **Multi-agent decision tree áp đúng**. 3 feature multi-layer (Domain + Mig + Service + 8 handler + 2 FE app + 4 DTO file) — tightly coupled reasoning chain → Implementer REFUSE per Cognition "writes single-threaded". Em main solo decision đúng, KHÔNG split tránh agent thrash.
+
+4. **Per-chunk discipline (5 chunk A-E)** mặc dù big-feature multi-layer >1000 LOC. Mỗi chunk verify build pass trước commit → rollback dễ nếu fail. Audit trail commit history rõ ràng cho future debug.
+
+5. **Test-after UAT default Phase 9** chấp nhận được khi feature nhánh enable mới (admin opt-in). Test-before BẮT BUỘC chỉ cho bug fix (gotcha #45 S21 t3 đã làm). Cảnh báo carry: Plan C test-after candidate cumulative ngày càng nhiều — cần dedicated commit "Test catch-up S21 t1-t4" sau UAT ổn.
+
+## Handoff
+
+- ✅ Chunk A `0294693` BE schema + Mig 28 committed local
+- ✅ Chunk B `c56024b` BE Service + handlers + DTOs committed local
+- ✅ Chunk C `a508564` FE Admin Designer committed local
+- ✅ Chunk D `d27caaf` FE eOffice mirror 2 app committed local
+- ✅ Chunk E (this) — Docs commit sau khi save session log
+- ⏭ **PENDING bro confirm push remote** — `git push origin main` 8 commit ahead `0a3b747..HEAD` (S21 t3 fix gotcha #45 + S21 t4 F1+F2+F3)
+
+User next action expected: UAT test 3 feature mới trong env Prod hoặc local. Sau UAT 2-3 lần ổn → Plan C bundle test-after catch up.
+
+## References
+
+- BE Service: `src/Backend/SolutionErp.Infrastructure/Services/PurchaseEvaluationWorkflowService.cs`
+- BE entity: `src/Backend/SolutionErp.Domain/ApprovalWorkflowsV2/ApprovalWorkflow.cs`
+- BE handlers: `src/Backend/SolutionErp.Application/PurchaseEvaluations/{PurchaseEvaluationFeatures, PurchaseEvaluationDetailFeatures, PurchaseEvaluationSupplierFeatures}.cs`
+- Mig 28: `src/Backend/SolutionErp.Infrastructure/Persistence/Migrations/20260513114505_AddAdvancedOptionsToApprovalWorkflows.cs`
+- FE Admin Designer: `fe-admin/src/pages/system/ApprovalWorkflowsV2Page.tsx`
+- FE eOffice × 2 app: `{fe-admin,fe-user}/src/components/pe/PeWorkflowPanel.tsx` + `PeDetailTabs.tsx` + `types/purchaseEvaluation.ts`
+- Spec context: gotcha #45 S21 t3 BE guard payload mismatch + Session 17 spec 5 trạng thái
+- Rules: §3.9 mirror 2 FE, §6.5 KEEP narrative, §7 test timing, `feedback_uat_skip_verify`, `feedback_per_chunk_commit`

docs/database/schema-diagram.md

@@ -715,7 +715,7 @@ CREATE TABLE PurchaseEvaluationDepartmentOpinions (
 CREATE UNIQUE INDEX IX_PEDeptOpinions_PEId_Kind ON PurchaseEvaluationDepartmentOpinions (PurchaseEvaluationId, Kind);
 ```
 
-## 14. ApprovalWorkflow V2 schema (Migration 22-25, Session 17-18 — 3 bảng mới + 3 column)
+## 14. ApprovalWorkflow V2 schema (Migration 22-28, Session 17-21 — 3 bảng mới + 9 column)
 
 Schema riêng song song WorkflowDefinition V1 (Mig 21) — pin per phiếu PE.
 V1 vẫn giữ cho phiếu cũ; V2 mới là active cho phiếu tạo từ Session 17 trở đi.
@@ -728,6 +728,15 @@ ApprovalWorkflows
 ├── ApplicableType (1=DuyetNcc, 2=DuyetNccPhuongAn, 3=Contract)
 ├── Name, Description, IsActive, ActivatedAt
 ├── IsUserSelectable (Mig 25, S18) — admin pin/unpin cho user pick lúc create phiếu
+│
+├── Mig 28 (S21 t4) — 6 advanced options "Cấu hình nâng cao" per workflow:
+├── AllowReturnOneLevel       bit DEFAULT 0  — F1 mode: Trả về 1 Cấp trước (peer review)
+├── AllowReturnOneStep        bit DEFAULT 0  — F1 mode: Trả về 1 Bước trước
+├── AllowReturnToAssignee     bit DEFAULT 0  — F1 mode: Trả về Người chỉ định (pick runtime)
+├── AllowReturnToDrafter      bit DEFAULT 1  — F1 mode: Trả về Drafter (S17 backward compat)
+├── AllowDrafterSkipToFinal   bit DEFAULT 0  — F2: Drafter trình thẳng Cấp cuối, skip trung gian
+├── AllowApproverEditDetails  bit DEFAULT 0  — F3: Approver chỉnh Section 2 lúc đang duyệt
+│
 └── (audit) CreatedAt, UpdatedAt, CreatedBy, UpdatedBy
 
 ApprovalWorkflowSteps  (FK Cascade ApprovalWorkflowId, FK Restrict DepartmentId)