[CLAUDE] Workflow: LeaveBalance business logic — trừ phép khi duyệt + số dư (Phase 11 P11-B)

Số dư phép theo (User × LeaveType × Year) + trừ tự động khi đơn nghỉ duyệt cuối.
Policy: cho phép vượt số dư (âm) + cảnh báo (anh main chốt), tích hợp vào trang đơn nghỉ.

Schema (Mig 42 AddLeaveBalances — pure additive, 1 bảng):
- LeaveBalance: UserId + LeaveTypeId + Year + EntitledDays + UsedDays + AdjustmentDays.
  UNIQUE (UserId,LeaveTypeId,Year), FK LeaveType Restrict, decimal(5,2).
  Remaining = Entitled + Adjustment − Used (computed, không store).

Deduction hook (ApproveLeaveRequestHandler nhánh terminal DaDuyet — exactly-once):
- Upsert LeaveBalance(RequesterUserId, LeaveTypeId, StartDate.Year), auto-create từ
  LeaveType.DaysPerYear, UsedDays += NumDays. Guard Status!=DaGuiDuyet chặn re-approve.

FK invariant guard (em main thêm sau test reveal FK risk):
- Create + UpdateDraft validate LeaveTypeId tồn tại (AnyAsync) → ConflictException.
  Đóng cửa vào — bogus type không thể tới deduction FK insert (tránh 500 kẹt đơn).

CQRS LeaveBalanceFeatures.cs: GetMy (self, lazy merge active LeaveType) + GetUser (admin)
  + AdjustLeaveBalance (admin upsert carry-over). Controller [Authorize] + admin Roles=Admin.
Embed: GetLeaveRequestByIdHandler trả balance NGƯỜI TẠO (approver xem thấy đúng).
FE: WorkflowAppDetailPage ×2 — block "Số dư phép" + cảnh báo vượt khi kind=leave (SHA256 identical).

Tests (+11, 130→154 PASS): deduction single/multi-level/accumulate/negative-allowed/
  reject-return-no-deduct + lazy-merge + adjust upsert + Create guard bogus→Conflict.
  Cũng repair 2 test S42 terminal FK-fail (template BuildLeave +seed LeaveType).

Verify: build 0 error · 154 test · FE ×2 · reviewer Max PASS (deduction exactly-once +
  FK invariant fully closed, 2 minor concurrency/comment defer).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude/agent-memory/reviewer/MEMORY.md

@@ -57,6 +57,7 @@ Adversarial pre-commit reviewer SOLUTION_ERP. Read-only verify + live curl prod
 
 ## 📅 Recent activity (FIFO — older → archive/git)
 
+- **2026-05-30 (S43 P11-B LeaveBalance pre-commit — PASS, Max no-truncate):** 14 file (LeaveBalance entity+config+Mig42 + Features + Controller + deduction hook + Create/Update LeaveType guard + embed balance + FE×4 + tests). 154 PASS (130→154). **Deduction exactly-once VERIFIED** (terminal else only, guard Status!=DaGuiDuyet chặn re-approve; advance/reject/return no-deduct). **FK invariant fully closed** — grep 2 write site LeaveTypeId (Create + UpdateDraft) cả 2 guard AnyAsync→Conflict, bogus type không thể tới terminal FK insert. Embed balance = RequesterUserId (approver thấy đúng người tạo). admin `[Authorize(Roles=Admin)]`. **2 MINOR defer:** concurrency lost-update UsedDays (no RowVersion — human-sequential accept) · stale line-num comment. Verdict PASS. Tag `[s43, p11b-leavebalance, max-clean]`.
 - **2026-05-28 (S35 G-H2 BE CRUD 16 endpoint pre-commit — PASS, Smart Friend 8× CLEAN):** 2 NEW file `HrmConfigFeatures.cs` 439 + Controller 137. build clean, 130/130 PASS. Cat1: 0 mock, 8 ConflictException (Holiday Update composite `(Year,Date)` BOTH fields). Cat3: class `[Authorize]` + 12 per-action `[Authorize(Roles="Admin")]`. Cat5: 8 Validator MaxLength MATCH EF source (Code=50 not spec 20). **2 MINOR defer:** ListHolidays no IsActive filter (inconsistent sibling) · OtPolicy "1 active unique" NOT enforced handler (G-P1 ambiguous nếu 2+ active). Verdict PASS. Tag `[s35, smart-friend-8x-clean]`.
 - **2026-05-26 (S33 Plan B G-H1 Phase 2 pre-commit — PASS, Smart Friend 6× CLEAN):** 17 file (3 BE + 6 FE new + 6 mod + 2). SHA256 mirror 3 file IDENTICAL admin==user. 5 endpoint real mediator.Send 0 mock. Mig 34 `AddEmployeeProfiles` 7 table UNIQUE indexes + FK Cascade. SeedDemoEmployeeProfiles NOT gated DemoSeed (gotcha #51 ✓). gotcha #50 Layout staticMap mirror ✓. **3 MINOR defer:** EmployeeCode race SERIALIZABLE low-risk · Update 3 bool not nullable (partial reset) · Delete DateTime.UtcNow direct. Verdict PASS. Tag `[s33, hrm-mig34, smart-friend-6x]`.
 - **Smart Friend cumulative 8× CLEAN:** (1) S22 #44 silent-403 · (2) S25 #48 SQLite tie-break · (3) S29 password ≥12 · (4) S29 ApplicableType cross-module · (5) S33 BW test · (6) S33 Plan B Phase 2 · (7) S35 FE forms · (8) S35 G-H2. Plus 9× G-O2 (S36, em không track ở đây). 2 MAJOR catches total (S29 password + S29 ApplicableType); rest clean với MINOR defer.