solution-erp/.claude/agent-memory/implementer-backend/MEMORY.md

# 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`.
> **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)

- **2026-06-16 (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 (NO mig, 3 file edit, em-main spec deterministic 100% → ACCEPT Case 1):** **#3 LeaveBalance lost-update** `LeaveOtApprovalFeatures.cs` terminal DaDuyet branch → atomic-executeupdate-tx (spec chosen, KHÔNG RowVersion/Mig). Replaced in-mem `bal.UsedDays += NumDays` với: set p.Status/Updated* → `(DbContext)db` cast + `BeginTransactionAsync(ct)` (plain, NO IsolationLevel — READ COMMITTED đủ vì increment atomic) → STEP1 ensure-row (FirstOrDefault, auto-create UsedDays=0 via tracker) + SaveChanges (opinion+status+insert trong tx) → STEP2 `db.LeaveBalances.Where(...).ExecuteUpdateAsync(s=>s.SetProperty(b=>b.UsedDays, b=>b.UsedDays+p.NumDays), ct)` server-side row-lock race-free → `tx.CommitAsync` + **`return;`** (skip trailing shared SaveChanges). **STALE-TRACKED caveat (load-bearing):** ExecuteUpdate bypass tracker → tracked `bal` giữ pre-increment value; SAFE vì không đọc lại + handler return ngay; KHÔNG thêm `bal.UsedDays +=` (double-count). `using System.Data` + EF Core đã import. **#5 AssignItTicketHandler existence-oracle** `WorkflowAppsFeatures.cs:493` → moved Admin-OR-dept-IT Forbidden guard (itDeptId+isAdmin+myDeptId resolve) TRƯỚC ticket NotFound lookup → fail-closed (non-IT nhận Forbidden cho MỌI ticketId). assignee-must-be-IT Conflict + reassign giữ nguyên. **#6 DocxRenderer.cs:30,40 CS8602** → hoist `mainPart = doc.MainDocumentPart ?? throw InvalidOperationException` + `document = mainPart.Document ?? throw` (Document cũng nullable — KEY: 1st hoist chỉ fix part, vẫn còn 1 warn ở `.Document.Body`); deref qua local non-null. Build SolutionErp.slnx **0 err 0 warn** (DocxRenderer warn CLEARED — thực tế 1 warn không phải 2 như MEMORY ghi). Test 58 Domain PASS + 154/158 Infra: **4 FAIL `LeaveBalanceTests` (Approve_LastLevel_DeductsLeave.../AccumulatesExisting.../OverEntitled.../MultiLevel_NoDeductAtIntermediate)** = EXPECTED #3 stale-tracked (re-query trả tracked instance pre-increment, DB row đúng) → tests_to_update cho test-specialist (add AsNoTracking/ChangeTracker.Clear). ItTicket authz tests #5 PASS (Case5 đã expect Forbidden, NotFound case dùng Admin caller). KHÔNG touch tests/FE/commit. #4 (Travel/Vehicle smoke test) = test-specialist next stage. Tag `[s56, golive-harden, executeupdate-atomic, fail-closed-authz, cs8602, no-mig]`.
  ↳ **[em main post-review S56]** Tx bumped → `IsolationLevel.Serializable` (shipped code `LeaveOtApprovalFeatures.cs:369`) per database-agent review — convention-align (codegen/Proposal/TravelVehicle) + serialize auto-create-row race. '(plain, NO IsolationLevel — READ COMMITTED đủ)' ở entry = pre-review reasoning, **superseded**. Test 228 green.
- **S55 master-data import (Mig 48 `AddProjectMasterFields` 4 AddColumn no-table + `SeedRealMasterDataAsync` 62 Project+71 WorkItem+3 Supplier) [proxy by em main — agent return truncated gotcha #53 before MEMORY step]:** Project entity +4 prop (`Year int?`, `Investor/Location/Package string?`, maxlen 250/500/300 ProjectConfiguration). `ProjectFeatures.cs` DTO+CreateCmd+UpdateCmd+validators+handlers+List/Get projections +4 (all nullable, appended end). **`SeedRealMasterDataAsync`** = 3 tuple-loop per-code idempotent (mirror `SeedDemoMasterDataAsync:2185` `existingCodes.Contains→skip`) wired UNGATED line 118 AFTER `SeedCatalogsAsync` → reaches prod (DemoSeed:Disabled=true KHÔNG gate, by-design như SeedDemoMasterData/Catalogs). Project Name=Code khi Excel blank. WorkItem 4 Category (Vật tư16/Thầu phụ30/MEP9/Thiết bị16, gen Code VT/TP/MEP/TB-NN; divider "THIẾT BỊ" dropped). Supplier NTP→NhaThauPhu/NCC→NhaCungCap, extras→Note. **FLOCK01 collision** demo↔real → per-code skip (demo thắng, real code+year only, OK). Compile-fix `MasterCatalogFilteredUniqueTests.cs` +4 null args CreateProjectCommand (necessary build-green). **Runtime Dev proof (em main):** app-start seeded 62proj/71wi/3sup landed, CAL01.Investor col populates, 0 overflow/dup. Build 0/0, test 216. Data spec `scripts/master-import-data.generated.md`. Tag `[s55, master-import, mig48, seed-real-ungated, project-4field]`.
- **S54 ItTicket reassign cross-stack — IT-staff self-service (NO migration, 2 BE file edit):** NEW `GetAssignableItStaffQuery`+`AssignableStaffResult(CanReassign,Staff)`+`AssignableStaffDto(Id,FullName)` capability endpoint (REGION 5 WorkflowAppsFeatures.cs) + MODIFIED `AssignItTicketHandler`: authz Admin-OR-dept-IT → `ForbiddenException`; assignee-must-be-IT → `ConflictException`. Controller `/assign` hạ `[Authorize(Roles="Admin")]`→`[Authorize]` (handler enforce fine-grained data-driven) + NEW `GET /assignable-staff`. Predicate IT = reuse round-robin S52 `Departments.Where(Code=="IT" && !IsDeleted)`. `ICurrentUser` KHÔNG có DepartmentId → query `db.Users.Where(Id==cu.UserId).Select(DepartmentId)`. 2 pattern split (em main reconciled từ stray src/Backend/.claude — cwd-relative Write mishap): [[pattern-controller-lower-authorize-handler-finegrained]] + [[pattern-scoped-capability-endpoint-anti-silent-403]]. Build 0/0, test 203→216 (test-specialist +13 authz), reviewer PASS (role-string "Admin" chain-verified real: AppRoles→SeedRoles→JWT ClaimTypes.Role→cu.Roles). Tag `[s54, it-ticket-reassign, capability-endpoint, authz-handler, no-mig]`.
- **S54 Task D BE — promote AttendanceReport to sidebar menu leaf (NO migration, 2 file edit):** Case 1 mechanical, menu = DbInitializer idempotent seed (not schema). 3 insert: (1) MenuKeys.cs const `OffAttendanceReport = "Off_AttendanceReport"` after OffChamCong:124 · (2) MenuKeys.cs All[] Off-group line +`OffAttendanceReport` after OffChamCong:158-159 · (3) DbInitializer.cs menu tuple `(OffAttendanceReport, "Báo cáo chấm công", Off, 8, "FileBarChart")` after OffChamCong:1787 (Order 8, parent Off, mirror Vehicle/Driver S51). **adminPermAutoViaAll=TRUE verified 2-point:** `SeedAdminPermissionsAsync` DbInitializer:1916 iterates `MenuKeys.All` → full-CRUD Permission row per missing key (idempotent `existingMenuKeys.Contains`); `Program.cs:78` iterates All × Actions → policy registration. +All[] = both auto, NO manual grant. **Idempotent-add verified:** menu upsert loop DbInitializer:1845-1862 `existingItems.TryGetValue(key)` miss → `MenuItems.Add` (existing prod gets leaf on restart, existing rows only Order-reconciled — same as S51). Build 0 err (2 pre-existing DocxRenderer warn). KHÔNG touch FE (menuKeys.ts/Layout = implementer-frontend) / tests / commit. Tag `[s54, task-d, menu-leaf, no-mig, admin-perm-via-all]`.

- **S53 gotcha #57 EXT BE — filter 3 Master Code unique indexes + Mig 46 local catch-up (Mig 47 `FilterMasterCatalogUniqueIndexesByIsDeleted`, index-only no-table):** Test-before RED→GREEN driven (test-specialist `MasterCatalogFilteredUniqueTests`, 3 FAIL on unfiltered → must turn GREEN). gotcha #57 4th+5th+6th cumulative (S45 Holiday Mig 43, S51 HRM×3 Mig 45 → now Department/Project/Supplier). Edit 3 config Code unique: `b.HasIndex(x=>x.Code).IsUnique()` → `+.HasFilter("[IsDeleted] = 0")`. **KEY: copied EXACT filter string byte-for-byte from HolidayConfiguration:18 + LeaveTypeConfiguration:19** (spaces around `=`, NOT guessed) → snapshot+SQL Server consistent with 13 existing filtered indexes. SupplierConfiguration: ONLY Code index filtered, `HasIndex(x=>x.Type)` :25 LEFT untouched (verified snapshot 3590 Type no-filter). Mig diff CLEAN: Up=3×DropIndex+3×CreateIndex filtered, Down=3×reverse unfiltered (no drift, no extra table/col). Master entities HAVE global `HasQueryFilter(!IsDeleted)` (unlike HRM) — app-check `db.X.AnyAsync(Code==req.Code)` filters soft-deleted → passed; then bare DB index counted it → UNIQUE violation 500. Filter aligns DB index with app-check. **Mig 46 local catch-up:** S52 left local LocalDB stuck at Mig 45 (prod had 46 via CI, local gap). `database update` to BOTH DBs applied Mig 46 (`AddSlaFieldsToItTicket`) THEN Mig 47 — residual closed. Dev override `--connection SolutionErp_Dev`; Design factory-default `SolutionErp_Design` (both `(localdb)\MSSQLLocalDB`). Build 0 err (2 pre-existing DocxRenderer warn). Full suite 203 GREEN (58 Domain + 145 Infra, +3 new). KHÔNG touch FE/test/commit (em main commits). Tag `[s53, gotcha-57-ext, mig47, mig46-catchup, filter-byte-for-byte]`.

- **S52 P11-D Wave2 BE — ItTicket round-robin + SLA (Mig 46 `AddSlaFieldsToItTicket`, 3 AddColumn no-table) [proxy by em main: agent killed session-limit trước MEMORY step]:** Entity +SlaDueAt/SlaWarnedSent/SlaBreached. `CreateItTicketHandler`: `SlaWindow` static map (Urgent4/High8/Medium24/Low72h) **shared với `ItTicketSlaJob`** (single-source) → `e.SlaDueAt=CreatedAt+window`. Round-robin least-loaded: `db.Users.Where(DepartmentId==itDeptId && IsActive).OrderBy(db.ItTickets.Count(assigned && !Closed && !Resolved)).ThenBy(Id).First()` (itDept = `Departments.Code=="IT"`); no IT-staff → unassigned. NEW `ItTicketSlaJob:BackgroundService` mirror SlaExpiryJob (30s warmup/15min loop/scope) NHƯNG **KHÔNG auto-transition** — chỉ breach (SlaDueAt<now & !breached & open → SlaBreached=true + notify assignee) + warning (≤20% window → notify + SlaWarnedSent), idempotent qua guard. DI `AddHostedService<ItTicketSlaJob>` sau SlaExpiryJob. `AssignItTicketCommand` + PUT `/{id}/assign` `[Authorize(Roles=Admin)]`. DTO +SlaDueAt/SlaBreached + projection. **DbInitializer `SeedItDepartmentStaffAsync` KEY ordering: PHẢI chạy SAU `SeedDemoUsersAsync`** (method đó reconcile 2 user dept về PRO/CCM mỗi boot → override về IT sau, end-state deterministic) + dept "IT" thứ 10 + gán nv.cao/nv.truong (sample user, idempotent). Build 0-err. Tag `[s52, p11-d, mig46, round-robin, sla-job, seed-ordering]`.

- **S52 P11-E+F Wave1 BE migration-FREE (4 file new + 3 edit, NO mig):** Case 1/2 deterministic ~98% em main. **P11-F** (2 LOC): `CreateItTicketHandler` set `e.MaTicket = WorkflowAppCodeGen.GenerateMaDonTuAsync(db,"IT",clock.Now.Year,clock,ct)` TRƯỚC `db.ItTickets.Add` — gen lúc Create (kanban no-workflow, khác Leave/OT gen lúc Submit). Helper = `internal static` cùng ns Office, gọi trực tiếp no-using. Format `IT/2026/001`. **P11-E** report chấm công: NEW `AttendanceReportFeatures.cs` (DTO 3 record EXACT + GetAttendanceReportHandler) + NEW `IAttendanceReportExcelExporter`(App/Reports/Services) + NEW Infra `AttendanceReportExcelExporter`(ClosedXML mirror ContractExcelExporter, sync `Export(dto)` no-DB) + DI scoped + Controller +2 endpoint `[Authorize(Roles=Admin)]`. **KEY gotcha day-type:** DayOfWeek+holidaySet KHÔNG EF-translate → `.ToListAsync()` rồi group/classify IN-MEMORY C#. **KEY gotcha type:** `Holiday.Date`=**DateOnly** KHÔNG DateTime (spec viết HashSet<DateTime> nhầm) → `HashSet<DateOnly>` + so `DateOnly.FromDateTime(a.AttendanceDate.Date)`. OtPolicy active fallback 1.5/2.0/3.0. Day-type prio: holiday→weekend(Sat/Sun)→weekday. OtWeighted=Σ(cấp×hệ số). FullName denorm ưu tiên `Attendance.UserFullName` rồi User.FullName. DeptName LEFT JOIN. RenderResult=(Content,FileName,ContentType) ns Forms.Services. Controller inject exporter ctor. Build 0 err (2 pre-existing DocxRenderer warn). KHÔNG touch FE/test/mig/ItTicket-khác. Routes: GET `/api/attendances/report?year&month&departmentId` + `/report/excel`. Tag `[s??, p11-e-f, wave1, no-mig, day-type-in-memory, dateonly-holiday]`.

- **S51 P11-C HMW W1 — Vehicle+Driver catalogs HrmConfigs (Mig 44 `AddVehicleAndDriverCatalogs`, 9 add-point ~12 file/edit):** Pattern 12-bis catalog-mega 4th cumulative. 2 entity (`Vehicle`/`Driver`:AuditableEntity Domain/Hrm) + 2 EF config (mirror `HolidayConfiguration` filtered, NOT buggy bare LeaveType) + 2 DbSet (IAppDbContext+ApplicationDbContext) + Mig 3-file + HrmConfigFeatures Region5/6 (DTO+List/Create/Update/Delete CQRS mirror Region1 EXACT) + Controller +2 route group (8 endpoint, GET public + POST/PUT/DELETE `[Authorize(Roles=Admin)]`) + MenuKeys +2 const +All array + DbInitializer (menu 2 leaf + SeedHrmConfigsAsync guard&seed 2 veh+2 drv). **gotcha #57 KEY:** Code UNIQUE `.HasFilter("[IsDeleted]=0")` — Mig diff verified CLEAN 2 CreateTable + 2 filtered IX no drift. Validator MaxLength = em main schema (Code50/Name200/Plate20/Phone20/LicNum50/LicClass20/Desc500), SeatCount GreaterThanOrEqualTo(0). Admin perm AUTO-grant: `SeedAdminPermissionsAsync` + `Program.cs:78` both iterate `MenuKeys.All` → +All array = 8 policy + Admin row auto (no manual grant code). HRM no HasQueryFilter → `.Where(!IsDeleted)` manual. Applied BOTH DB. Build 0 err (2 pre-existing DocxRenderer warn). RAG/Qdrant DOWN → all Read/Grep on-disk. Spec deterministic ~98% em main → ACCEPT Case 1. KHÔNG touch FE/test/commit. Tag `[s51, p11-c, mig44, vehicle-driver, catalog-mega]`.
- **S43 P11-B Wave 1 — LeaveBalance business logic (Mig 42 `AddLeaveBalances`, 7 file: 1 entity + 1 config + 2 DbSet edit + Mig 3-file + 1 hook edit + 1 Features + 1 Controller):** Case 1/3 deterministic ~98% em main spec. Pattern 12-ter-adjacent single-entity: entity `LeaveBalance:AuditableEntity` (UserId/LeaveTypeId/Year + EntitledDays/UsedDays/AdjustmentDays decimal(5,2), nav LeaveType). Config FK LeaveType WithMany() **Restrict** (catalog no cascade) + UNIQUE composite (UserId,LeaveTypeId,Year) + IX UserId. Mig diff CLEAN: 1 CreateTable + 3 IX, no drift. Applied BOTH DB (Dev `SolutionErp_Dev` + Design default). **Deduction hook:** insert in `ApproveLeaveRequestHandler` terminal else (DaDuyet branch) ONLY — UPSERT LeaveBalance, `bal.UsedDays += p.NumDays`, exactly-once guaranteed by early guard `Status != DaGuiDuyet throw`. OtRequest/Travel/Vehicle UNTOUCHED (only Leave has balance). CQRS `Application.Hrm`: DTO RemainingDays=Entitled+Adjustment−Used COMPUTED (not stored) + GetMy/GetUser lazy-merge (load active LeaveTypes + balances → in-memory merge, synth default when no row — KHÔNG EF LEFT JOIN translate) + AdjustLeaveBalanceCommand admin upsert (HasValue-gated). **Policy resolved:** HRM admin convention = `[Authorize(Roles="Admin")]` NOT menu policy (verified HrmConfigsController write endpoints) — used on GET-by-user + PUT /adjust; /my = `[Authorize]`. Controller injects IDateTime for year default `clock.Now.Year` (thin, no DateTime.Now hardcode). HRM no HasQueryFilter → `.Where(!IsDeleted)` manual everywhere. KHÔNG touch FE/test/commit. Build 0 err (2 pre-existing DocxRenderer warn). Tag `[s43, p11-b-w1, mig42, leave-balance, single-entity]`.
- **S42 P11-A SEED — 4 sample ApprovalWorkflow V2 for WorkflowApps (DbInitializer.cs only, +4 method ~210 LOC + 4 call):** Case 1 mechanical mirror `SeedSampleProposalWorkflowV2Async` EXACT × 4 (Leave5/Ot6/Travel9/Vehicle7). Each: idempotent `AnyAsync(ApplicableType==X)` guard → resolve approver `binh.le@solutions.com.vn` (SAME user as Proposal/Contract seed, null→LogWarning+return) → 1 ApprovalWorkflow (Version=1, IsActive+IsUserSelectable=true, ActivatedAt=UtcNow) + 1 Step (Order=1, Name="Cấp duyệt", DepartmentId=CCM?.Id) + 1 Level (Order=1, ApproverUserId). Codes QT-NP/OT/CT/XE-V2-001. Wired 4 calls after SeedSampleProposalWorkflowV2Async (NOT gated DemoSeed, gotcha #51 infra seed). Enum verified Grep. Build 0 err 0 warn. Bash tool = bash NOT PowerShell despite env hint (use `cd && cmd | grep`). Spec deterministic 100% → ACCEPT Case 1. NOT touched App/Controller/FE/test/Mig. Tag `[s42, p11-a, seed, mirror-proposal-exact]`.
- **S42 P11-A Wave 2b APP — wire ApproveV2 CQRS Travel+Vehicle (`TravelVehicleApprovalFeatures.cs` ~830 LOC + 2 controller edit):** Cookie-cutter mirror Wave 2a / ProposalFeatures Region 2. 1 new file ns `Application.Office`: 2 module × (DetailDto + LevelOpinionDto + GetById JOIN Step/Level metadata + UpdateDraft + Submit + Approve UPSERT+advance + Reject TuChoi + Return TraLai+RejectedFromStatus) + 1 shared `internal static TravelVehicleCodeGen.GenerateMaDonTuAsync` (Serializable tx, `WorkflowAppCodeSequences` Prefix-keyed, prefix `DT/CT/{year}` Travel & `DX/XE/{year}` Vehicle, format `{prefix}/{seq:D3}` — D3 no year segment per spec). KEY gotcha: WorkflowAppStatus enum DIFFERS from ProposalStatus int values (DaGuiDuyet=2 not 1, TraLai=3) → mirror by SEMANTIC enum member not literal. Owner = `RequesterUserId` (not DrafterUserId). Submit verify wf.ApplicableType==Travel9/Vehicle7 else Conflict. 2 controller +6 route each (GET{id}/PUT/submit/approve/reject/return) nested body records, CreatedAtAction. KHÔNG sửa WorkflowAppsFeatures.cs/Leave/Ot/FE/test/seed. Build 0 err. Spec deterministic ~98% em main → ACCEPT Case 1/2. Tag `[s42, p11-a, wave-2b, mirror-proposal-region2]`.
- **Archived S42 P11-A Wave 2a APP (LeaveOt ApproveV2 CQRS) → git history (S65b FIFO trim):** KEY absorbed Pattern 4 + WorkflowAppCodeGen Serializable-tx Prefix-keyed `{prefix}/{year}/{seq:D3}` + WorkflowAppStatus enum DIFFERS ProposalStatus (mirror SEMANTIC member not literal) + Owner=RequesterUserId. Detail in Wave 2b entry above + S56 em-main Serializable note.
- **S41 P11-A Wave 1 SCHEMA — wire ApproveV2+LevelOpinions 4 WorkflowApps (Mig 41 `WireWorkflowAppsApprovalV2`):** Pattern 12-bis cookie-cutter mirror Proposal Mig 38, 13× cumulative. 11 file: 5 entity (4 `{Leave,Ot,Travel,Vehicle}RequestLevelOpinion` + shared `WorkflowAppCodeSequence` Prefix-PK) + 5 EF config (auto-discover ApplyConfigurationsFromAssembly, no manual register) + edit 4 parent (nav LevelOpinions + `WorkflowAppStatus? RejectedFromStatus`) + edit enum (`TravelRequest=9`) + 2 DbSet (IAppDbContext+ApplicationDbContext, 5 each). Mig diff CLEAN: 5 CreateTable + 4 AddColumn (no drift). FK Cascade parent + Restrict Level + UNIQUE composite ({Parent}Id, ApprovalWorkflowLevelId). Applied BOTH DB (Dev + Design). Build 0 err. Wave 2 (App/Controller) + Wave 4 (test) deferred per spec. Spec deterministic 100% (em main chose schema) → ACCEPT Case 1. Tag `[s41, p11-a, 12-bis-13x, mig41]`.
- **Archived S35 G-H2 BE-CRUD-4-catalog + S29 Plan-B-Chunk-C Contract-V2-mirror → `archive/2026-05-q4.md` (S65 FIFO trim):** KEY absorbed Pattern 12-bis foundation above (catalog-mega + HRM `.Where(!IsDeleted)` manual + Validator MaxLength=EF-source).
- **Archived FE/test + older BE entries → `archive/2026-05-q4.md` + git d2f52ba (S40 curate):** S35 FE inline forms 5 satellite (→ frontend domain) · S34 test bundle +10 [Fact] 130 PASS (→ test-specialist domain) · S33 Task 5 EmployeesListPage · S32 wrap/startup. KEY absorbed in Patterns above + split pointers.

---

## 🔄 Curate trigger
- >~30KB → archive recent → L2 `archive/<period>.md`. Stale >3mo → remove.
- **Last curate: 2026-05-29 S40 em main proxy** (30.9→~18KB): **dedup split** — removed FE patterns (5/6/13/14/15/16-bis → implementer-frontend) + test patterns (10/11/12 → test-specialist), condensed Pattern 12-bis/12-ter, refreshed stale (104/111→130 test, Opus 4.7→4.8 model). BE patterns 1-4/7-9/12-bis/12-ter foundation preserved. Prev: S34 q3 · S32 q2 · S22 q1.