# Implementer-Backend Agent — Persistent Memory

> **Persistent diary cross-session.** Auto-injected first ~200 lines at spawn (L1 HOT).
> Update BEFORE every stop. Tiered Memory v1: L1 HOT soft-cap ~30KB · L2 `archive/` on-demand · L3 RAG `search_memory` just-in-time. Keep entry ≤ 1.5K chars (gotcha #53).
> Full verbatim history pre-S40 → git `d2f52ba` + `archive/2026-05-q1..q4.md` + `archive/2026-06.md`. 🗺️ **Lookup map (Harness-9 S70): `archive/_INDEX.md`** — 1 dòng/bản-ghi + con-trỏ substring (sha-keyed, Ctrl-F fallback); đọc verbatim + `2026-0{5,6}.gist.md` (nén 4-field) theo nhu cầu.
> **Renamed S39:** implementer → implementer-backend (.NET half). FE patterns → `implementer-frontend` MEMORY. Test patterns → `test-specialist` MEMORY.

---

## 🎯 Role baseline

WRITE specialist .NET backend SOLUTION_ERP (`Domain+Application+Infrastructure+Api`). Case 1+2+3+5 only. Tools: Read, Edit, Write, Bash, Skill, Grep, Glob + 5 RAG MCP. Skills: `ef-core-migration` + `permission-matrix` + `contract-workflow` + `form-engine`. Output: commits + verify report.

## 🚫 Split boundary (S39) + auto-refuse
- ✅ MINE: `src/Backend/SolutionErp.{Domain,Application,Infrastructure,Api}/**`
- ❌ NOT: `fe-*/**` → `implementer-frontend` · `tests/**` → `test-specialist` · schema/UX/architecture decision → em main
- **REFUSE if ANY:** 1 schema design (FK/nullable/discriminator) · 2 UX flow · 3 cross-stack >2 layer · 4 bug fix reasoning chain · 5 integration multi-component · 6 <30min trivial · 7 first-time no precedent · 8 spec ambiguity >20%

---

## 📋 BE Patterns proven (apply confidently)

### Pattern 1: Per-chunk discipline A-E
A Domain+Mig (3-file) · B Application CQRS (Command/Query/Validator) · C Service (workflow logic) · D Api Controller · E commit. Build+test pass mỗi chunk. Commit `[CLAUDE] <scope>: Chunk X — ...` + Co-Authored-By Claude Opus 4.8 (1M context).

### Pattern 2: EF migration 3-file rule (gotcha #17 — BẮT BUỘC commit đủ)
`{TS}_{Name}.cs` + `.Designer.cs` + `ApplicationDbContextModelSnapshot.cs`. Path `src/Backend/SolutionErp.Infrastructure/Persistence/Migrations/`.
```bash
dotnet ef migrations add <Name> --project src/Backend/SolutionErp.Infrastructure --startup-project src/Backend/SolutionErp.Api
# Apply Dev (runtime): --connection "Server=(localdb)\MSSQLLocalDB;Database=SolutionErp_Dev;Trusted_Connection=True;TrustServerCertificate=true"
# Apply Design (ef default): không cần --connection
```
Apply BOTH DB per `feedback_designtime_runtime_db`.

### Pattern 3: Audit reuse trước khi clone (`feedback_audit_reuse_before_clone`)
"Clone X→Y": grep discriminator (`ApplicableType`/`Type`/`Kind`) → check Service/Handler hardcode → check FE route dynamic → check menu key (BE const + FE menuKeys.ts thường thiếu) → default reuse 80%, chỉ thêm menu key + sample seed.

### Pattern 4: Service hook vs CRUD endpoint cho derived state (`feedback_service_hook_vs_endpoint`)
State X derived của action Y → UPSERT trong handler Y, KHÔNG endpoint /X riêng. VD `ApproveV2Async` UPSERT LevelOpinion qua match `ApproverUserId==actorUserId` (fallback first khi Admin override). 0 endpoint mới.

### Pattern 7: Per-NV admin opt-in flag (Mig 29/30/31)
`ApprovalWorkflowLevel` +1 `bool` DEFAULT 0 (opt-in). EF `HasDefaultValue(false)`. DTO extend. FE Designer checkbox inline. Scope role-context → table mapping (Approver→Level table carry ApproverUserId FK, Drafter→User table direct, `feedback_per_nv_permission_scope`). Reusable F5/F6.

### Pattern 8: Tách endpoint riêng cho narrow scope
1 action 2 scope theo role → tách endpoint (guard tự nhiên + audit). VD Drafter `UpdatePeDraft` (Section 1 rộng, phase Nháp/Trả lại) vs Approver `AdjustBudget` (Budget rows hẹp, phase Đang duyệt + per-NV flag). KHÔNG default expand Drafter scope cho Approver.

### Pattern 9: Defense-in-depth FE+BE guard pair
UI `disabled={!canX}` + BE helper `EnsureCanXAsync(id, userId)` throw 403 (NOT inline handler) — tránh forge qua DevTools. Bất kỳ action sensitive (approve/reject/adjust).

### Pattern 12-bis: Cross-module entity cookie-cutter mirror (S29 Plan B, proven 3×)
"Mirror entity X từ module A→B": 6 file MAX — (1) new entity `Domain/<Mod>/<Entity>.cs` rename FK+nav · (2) parent +nav collection · (3) IApplicationDbContext +DbSet · (4) ApplicationDbContext +`Set<X>()` · (5) new `<Entity>Configuration.cs` (separate file mirror PE, NOT inline) · (6) `dotnet ef migrations add` 3-file. AuditableEntity inherit. FK: parent Cascade + 3rd-party Restrict + User skip-nav (denorm `<Type>ByFullName`). Apply 2 DB. ⚠️ Catalog-mega variant (S35 HrmConfig): HRM entities KHÔNG có global `HasQueryFilter(!IsDeleted)` (vs Master) → list query MUST `.Where(!IsDeleted)` thủ công (verify `Grep HasQueryFilter` Configurations FIRST). Validator MaxLength MATCH EF config (verify source-of-truth, KHÔNG trust spec blind).

### Pattern 12-ter: N≤7 satellite CRUD scaffold same parent (S34, `feedback_within_module_n_satellite_scaffold`)
"N satellite cùng parent" → 1 mega file `<Parent>SatelliteFeatures.cs` N region cookie-cutter (Create verify parent `AnyAsync` → Update `FirstOrDefault !IsDeleted` → Delete soft `IsDeleted+DeletedAt+DeletedBy` ICurrentUser) + 1 Controller extend (3 verb × N). Endpoint verify `parentId==cmd.ParentId` BadRequest mismatch. Per-action policy override class-level Read.

### Patterns moved (split S39)
- **FE patterns** (5 mirror 2-app · 6 VND helpers · 13 read-only Designer · 14 Tailwind JIT palette · 15 rowSpan builder · **16-bis 4-place mirror**) → `implementer-frontend` MEMORY (seeded).
- **Test patterns** (10 reflection authz · 11 test infra helper · 12 InternalsVisibleTo) → `test-specialist` MEMORY (seeded).

---

## ⚠️ Anti-patterns (DO NOT)
1. ❌ Skip MEMORY · 2. ❌ `--no-verify` · 3. ❌ `git add -A`/`git add .` (specific files) · 4. ❌ Touch outside spec scope · 5. ❌ Push remote autonomous (em main pushes) · 6. ❌ Modify `SolutionErp.slnx` autonomous · 7. ❌ Lower bar match em main (Smart Friend) · 8. ❌ Proceed khi ambiguity >20% → REFUSE

---

## 🧠 SOLUTION_ERP BE conventions (S40)
- **BE .NET 10:** PascalCase entities + DTO records + command names. CQRS+MediatR+FluentValidation+AutoMapper. Repository qua `IApplicationDbContext`. `GlobalExceptionMiddleware` → ProblemDetails (NO try-catch controllers).
- **State S53:** 47 mig (last `FilterMasterCatalogUniqueIndexesByIsDeleted` Mig 47, index-only) · 93 SQL tables · ~224 endpoints · 203 test (58 Domain + 145 Infra, test-specialist owns). Phase 9 UAT skip per chunk (`feedback_uat_skip_verify`).
- **Build:** `dotnet build SolutionErp.slnx` clean 0 err. Commit `[CLAUDE] <scope>: <msg>` + Co-Authored-By Claude Opus 4.8 (1M context).
- **Pin (KHÔNG `*`/latest):** MediatR `12.4.1` (14 fail DI) · Swashbuckle `6.9.0` · Node CI `20.x` · LibreOffice `25.8.6` · @microsoft/signalr `8.0.7`.

---

## 📅 Recent activity (FIFO — older → archive/git)

- **2026-06-19 (PE chuông báo approver BE — NO migration, 1 edit/1 file, em-main spec deterministic 100% → ACCEPT Case 1):** Tra Sol (Zalo) "không thấy chuông — việc có hồ sơ cần duyệt": approver Cấp hiện tại KHÔNG nhận notify khi phiếu ENTER/ADVANCE tới ChoDuyet (chỉ drafter báo terminal). FIX = +1 block trong `LogTransitionAsync` (PurchaseEvaluationWorkflowService.cs ~line 1058) NGAY SAU drafter-notify, KHÔNG endpoint mới (Pattern 4 — notify = side-effect của Submit/Approve-advance, cả 2 đã gọi LogTransitionAsync + end ChoDuyet). **Resolution mirror EXACT canonical** `EnsureActorInLevel` (line ~301): `db.ApprovalWorkflows.AsNoTracking().Include(Steps).ThenInclude(Levels)` → `stepsOrdered[CurrentWorkflowStepIndex]` (bounds-check) → `.Levels.Where(Order==CurrentApprovalLevelOrder && ApproverUserId!=Guid.Empty && !=actorUserId).Select(ApproverUserId).Distinct()` → `NotifyManyAsync(ids, Generic, "Phiếu cần bạn duyệt: {MaPhieu??TenGoiThau}", "Có phiếu Duyệt NCC đang chờ bạn duyệt.", /purchase-evaluations/{Id}, refId:Id, ct)`. **Recon:** (1) `ApprovalWorkflowLevel.ApproverUserId` = non-null `Guid` (NOT Guid?) → "exclude null" = `!=Guid.Empty` defensive (OR-of-N rows mỗi 1 NV). (2) `NotifyManyAsync` sig verified = `(IEnumerable<Guid>, NotificationType, title, string? desc, string? href, Guid? refId, CT)` khớp urgent-feature ref. (3) actor-exclude qua `!= actorUserId` (Guid != Guid? lift OK). **Guard V2-only:** `ApprovalWorkflowId is Guid && CurrentWorkflowStepIndex is int && CurrentApprovalLevelOrder is int` → V1/no-workflow skip. **Best-effort try/catch** nuốt lỗi (phiếu đã SaveChanges; notify fail KHÔNG rollback). Block đọc pointer SAU set → Submit (idx0/lvl1) + Approve-advance (pointer advance rồi LogTransition) đều fire đúng. Build SolutionErp.slnx (2 test project, gotcha #65) **0 warn 0 err**. KHÔNG test/FE/mig/commit. Tag `[pe-approver-bell, notify-many, log-transition-hook, no-mig, v2-only, best-effort-trycatch, pattern4-side-effect]`.
- **2026-06-19 (S77 PE +2 ghi-chú giá đề xuất BE — Mig 57 `AddPeSuggestedPriceNotes` 3-file, 6 edit/0 new file, COOKIE-CUTTER S73 suggested-price + S74 CcmNote, em-main CONTRACT-locked names 100% → ACCEPT Case 1):** PRO dải Min/Max + CCM 1 giá (S73) +ô GIẢI THÍCH vì-sao min vs max (anh Kiệt FDC + Tra Sol). 2 cột nullable, no table/index/backfill. (1) `PurchaseEvaluation.cs` +`string? ProSuggestedPriceNote`/`CcmSuggestedPriceNote` ngay sau CcmSuggestedPrice. (2) `PurchaseEvaluationConfiguration.cs` +`HasMaxLength(1000)` ×2 sau ApprovedPriceSource (KHÔNG index — free-text). (3) Mig: Up=2 AddColumn nvarchar(1000) nullable, Down=2 DropColumn, snapshot ×2 verified — clean mirror Mig 55. (4a) `UpdatePeSuggestedPriceProCommand` +trailing `string? Note=null` + validator `MaximumLength(1000)` MATCH-EF (S35) + handler **absolute-set** `pe.ProSuggestedPriceNote=request.Note` (null=clear, gia-đình text-field) + changelog part khi đổi. (4b) `UpdatePeSuggestedPriceCcmCommand` mirror + changelog suffix "(kèm ghi chú)". Role-gate KHÔNG đụng (Note gated y giá: Forbidden fail-closed TRƯỚC side-effect đã có). (5) Controller `SuggestedPriceProBody`/`CcmBody` +`string? Note` + pass `body.Note` vào cmd (4th/3rd positional). (6) `PurchaseEvaluationDetailBundleDto` +`ProSuggestedPriceNote`/`CcmSuggestedPriceNote` sau CcmSuggestedPrice + projection PEFeatures.cs positional-insert ĐÚNG order (DTO positional → order khít projection BẮT BUỘC). **Call-site grep verify (S65b lesson):** `new UpdatePeSuggestedPrice(Pro|Ccm)Command\(` repo-wide → 2 controller (đã sửa) + 18 test named-arg/positional-dừng-trước-Note → trailing-optional fully backward-compat, 0 test edit. FE 0 ref (đúng — implementer-frontend next). Build SolutionErp.slnx (2 test project, gotcha #65) **0 warn 0 err**. KHÔNG apply DB/FE/test/commit. Route: `note` camelCase qua PUT `/suggested-price/{pro,ccm}` body + GET detail bundle. Tag `[s77, pe-suggested-price-note, mig57, two-column-no-table, absolute-set, trailing-optional-callsite-safe, positional-dto-order]`.
- **2026-06-17 (S? Off_Dashboard menu leaf BE — NO migration, 3 edit/2 file, idempotent seed mirror S53/S54-TaskD, em-main spec deterministic 100% → ACCEPT Case 1):** +1 menu key `Off_Dashboard` ("Bảng điều khiển Văn phòng số"), pattern = S53 Off_AttendanceReport EXACT. 3 insert: (1) `MenuKeys.cs` const `OffDashboard = "Off_Dashboard"` ngay sau root `Off:99` · (2) `MenuKeys.cs` All[] line `Off, OffDanhBa` → `Off, OffDashboard, OffDanhBa` · (3) `DbInitializer.cs` SeedMenuTreeAsync tuple `(OffDashboard, "Bảng điều khiển Văn phòng số", Off, **0**, "LayoutDashboard")` trước OffDanhBa=1 (Order 0 = landing đầu nhóm, KHÔNG renumber children 1-7 hiện có). **KEY recon — Off_* leaves ARE IN All[] (NOT factory-excluded):** task hint "leaf may be excluded+granted-via-factory" KHÔNG áp Off (chỉ Pe_* leaf sinh động). Off_AttendanceReport :160 in All → tôi follow SAME = +All. Admin auto 2-point verified: `SeedAdminPermissionsAsync:2001` + `Program.cs:78` both iterate `MenuKeys.All` → +All = 4 policy {Read/Create/Update/Delete} + Admin Permission row auto, NO manual grant. **Revoke verified KHÔNG sửa:** `RevokeTemporarilyHiddenModulesAsync:2170` `p.MenuKey.StartsWith("Off")` → Off_Dashboard tự nằm trong scope ẩn-non-Admin. `InReviewScope:2070` chỉ match Catalog*/Master-keys/Pe_* → Off_Dashboard KHÔNG re-grant non-admin. Idempotent: upsert loop :1909 `existingItems.TryGetValue(key)` miss→Add / hit→chỉ reconcile Order (prod DB cũ nhận leaf next boot, re-run no-op). Build SolutionErp.slnx (gồm 2 test project, gotcha #65) **0 warn 0 err**. KHÔNG touch FE (menuKeys.ts/Layout=implementer-frontend)/test/mig/commit. Tag `[s?, off-dashboard, menu-leaf, no-mig, admin-perm-via-all, order-0-landing]`.
- **2026-06-16 (S65b PE +HoSoLink BE — Mig 51 `AddHoSoLinkToPurchaseEvaluation` 3-file, 6 file edit + 0 new file, em-main CHỐT spec 100% → ACCEPT Case 1):** Phiếu PE +1 cột `HoSoLink` = 1 hyperlink tới thư mục hồ sơ NAS (anh Kiệt paste link, FE render bấm-mở). KHÔNG entity con/bảng mới — 1 cột nullable. (1) `PurchaseEvaluation.cs` +`string? HoSoLink` sau MoTa. (2) `PurchaseEvaluationConfiguration.cs` +`HasMaxLength(1000)` (KHÔNG index — hyperlink free-text, không filter/join). (3) Mig via `dotnet ef migrations add` → Up=1 `AddColumn<string> nvarchar(1000) maxLength:1000 nullable` NO table NO index, Down=1 DropColumn; snapshot HoSoLink nvarchar(1000) verified. (4a) `CreatePurchaseEvaluationCommand` +trailing `string? HoSoLink = null` (sau WorkItemId — optional-param-after-required rule) + validator `MaximumLength(1000)` MATCH EF (S35 lesson) + handler `HoSoLink = request.HoSoLink`. (4b) `UpdatePurchaseEvaluationDraftCommand` +trailing `string? HoSoLink = null` + validator 1000 + handler **absolute-set** `entity.HoSoLink = request.HoSoLink` (Section-1 text-field family MoTa/DiaDiem pattern → null=clear, KHÔNG null-safe-keep như WorkItemId picker; deliberate: hyperlink user cần clear được). (5) `PurchaseEvaluationDetailBundleDto` +`string? HoSoLink` sau MoTa + projection `e.HoSoLink` positional-insert đúng vị trí. **RANG-CUNG grep verify (bài học CreateDepartmentCommand CS7036):** `Grep CreatePurchaseEvaluationCommand|UpdatePurchaseEvaluationDraftCommand` repo-wide gồm tests → 0 manual `new ...Command(...)` call-site (controller bind `[FromBody]` model-binding, KHÔNG manual ctor; tests dùng NAMED-ARG dừng ở WorkItemId) → trailing-optional-default fully backward-compat, KHÔNG sửa call-site nào. List DTO KHÔNG đụng (spec chỉ Detail/Get). `.slnx` KHÔNG update (chỉ 2 mig-file trong project có sẵn). KHÔNG apply DB/FE/test/commit. Build SolutionErp.slnx (gồm 2 test project) **0 warn 0 err** (DocxRenderer warn cleared). Route: `hoSoLink` camelCase qua POST/PUT body + GET detail. Tag `[s65b, pe-hosolink, mig51, one-column-no-table, trailing-optional-param, named-arg-callsite-safe]`.
- **2026-06-16 (S65 Department hierarchy BE — Mig `AddDepartmentParentId` 3-file, 4 file edit + 0 new file, em-main schema CHỐT → ACCEPT Case 1):** Cây tổ chức nền trang Hồ sơ Nhân sự. (1) `Department.cs` +`Guid? ParentId` loose-Guid KHÔNG physical FK (convention PE.ProjectId/WorkItemId/SelectedSupplierId). (2) `DepartmentConfiguration.cs` +`HasIndex(x=>x.ParentId)` only — **KHÔNG `HasOne` self-FK** (em main chốt loose). (3) `DepartmentFeatures.cs` +`GetDepartmentTreeQuery`+`DepartmentTreeNodeDto`+Handler (append existing file, NO new .cs → `.slnx` KHÔNG cần update; slnx lists projects-not-files). (4) `DepartmentsController.cs` +`[HttpGet("tree")]`. **KEY recon finding (spec asked verify):** `EmployeeProfile` has **NO `DepartmentId`** — links via `UserId`; org-chart dept field nằm trên **`User.DepartmentId`** (Mig 11) → GROUP BY `db.Users.Where(DepartmentId!=null && IsActive).GroupBy(DepartmentId).ToDictionary` = DirectEmployeeCount (recon NOT schema-decision). Tree ráp in-mem: roots=ParentId-null OR orphan-parent (safe-root); TotalEmployeeCount=Direct+Σ(Children.Total) đệ quy rollup via `record with{}`; **cycle-guard HashSet<Guid> visited** (node đã thăm→return null cắt vòng); Children sort `OrderBy(Code, StringComparer.Ordinal)` ổn định. **Authz copy-từ-đâu:** `[HttpGet]` List = CHỈ class-level `[Authorize]` (no per-action attr) → `/tree` cũng vậy (verified read controller). Mig diff CLEAN: AddColumn ParentId nullable + CreateIndex IX_Departments_ParentId, NO new table, Down DropIndex→DropColumn (SQL 5074 order). KHÔNG apply (prod/CI). Build SolutionErp.slnx 0/0. KHÔNG touch FE/test/seed-parent/commit (em main). Route `GET /api/departments/tree`→`List<DepartmentTreeNodeDto>`. Tag `[s65, dept-hierarchy, loose-guid-no-fk, in-mem-tree-rollup, cycle-guard, user-departmentid-source]`.

- **2026-06-11 (S57bis PE WorkItemId BE slice — PARTIAL, on-behalf em main ghi hộ, H2-proposed):** Return-truncated #53 TRƯỚC Mig 49 + projection-3 → em main solo hoàn tất (fix CS7036 + CS8019, Mig 49 `AddWorkItemToPurchaseEvaluation` 3-file, projection ListItemDto ×3 LEFT-join WorkItems, UpdateDraft null-safe `if (request.WorkItemId is not null)` chống null-hóa bug-class S42). LEARNED: FK-guard loose-Guid `AnyAsync(w.Id==x && w.IsActive)`→Conflict (mirror S43); validator `NotEmpty` create-only, DB nullable backward-compat 4 phiếu cũ; `NotEmpty()` trên `Guid?` KHÔNG chặn `Guid.Empty` → handler guard bắt (defense-in-depth). SURPRISE: truncate 2 session liên tiếp (S55, S57bis) ở slice lớn cross-layer → cắt stage nhỏ hơn (entity+config / mig / projection tách spawn). Tag `[s57bis, truncated-53, on-behalf]`.

- **2026-06-10 (S57-resume spawn-test H4.8 — Harness-4 two-tier):** Mình bị DEMOTE pin `model: claude-opus-4-8` (deterministic-scaffold class, double-gate reviewer+test+cicd sau lưng). Spawn-test echo model NGAY sau edit → self-report `claude-fable-5[1m]` = SE env (CCD harness) KHÔNG fresh-read frontmatter → pin ăn SAU restart CLI. Post-restart mình chạy Opus 4.8 (effort Max giữ env-wide); task hệ-trọng giao mình qua hmw có thể override `tier:'fable'`. Tag [h4-demote, spawn-test, pending-restart].

  _(S56 GOLIVE-HARDEN 3 BE fix — ExecuteUpdate-atomic LeaveBalance + fail-closed AssignItTicket authz + DocxRenderer CS8602 → FIFO'd S77; verbatim git/archive. em-main post-review bumped tx → `IsolationLevel.Serializable` per database-agent. Test 228 green.)_

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## 🔄 Curate trigger
- >~30KB → archive recent → L2 `archive/<period>.md`. Stale >3mo → remove.
- **Last curate: 2026-06-17 S70 Harness-9 (em-main + Stage-B workflow)** (33.2→17.4KB): L2 dark-matter recovery — 14 Recent-activity entries (S55→S35) → NEW `archive/2026-06.md` + `_INDEX.md` (substring sha-keyed) + `2026-0{5,6}.gist.md` (distill-gen:1). 0-byte-loss md5 byte-exact (Stage C audit CONCERN → read-side-gap MEMORY-L5→_INDEX fixed). _(cosmetic: 2 curate-meta lines carry `S?` worker-label.)_ Prev: S40 (30.9→~18KB dedup-split BE/FE/test) · S34 q3 · S22 q1.
