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docs(04): complete Inventory, Expenses, and Financial Reports phase

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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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kevin-asprec
2026-03-05 15:57:57 +08:00
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---
phase: 04-inventory-expenses-and-financial-reports
verified: 2026-03-05T12:00:00Z
status: passed
score: 5/5 must-haves verified
---
# Phase 4: Inventory, Expenses, and Financial Reports Verification Report
**Phase Goal:** Staff can track all network hardware through its full lifecycle as an immutable movement ledger; expenses are recorded and post to the ledger automatically; and the accounting module can produce a verified Trial Balance, Income Statement, and Balance Sheet from journal entry history alone.
**Verified:** 2026-03-05T12:00:00Z
**Status:** passed
**Re-verification:** No -- initial verification
## Goal Achievement
### Observable Truths
| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | Staff can register hardware and record movements as immutable events; stock levels derived from movement history | VERIFIED | InventoryService (429 lines) has registerItem, recordMovement with 5 movement types, getStockLevels derived via aggregation. StockMovement schema has no updatedAt (immutable). No mutable quantity column exists. 13 tests cover registration, movements, stock derivation. |
| 2 | Asset assigned to subscriber shows full location history | VERIFIED | AssetService (449 lines) has getAssetHistory returning chronological timeline with resolved subscriber/technician/warehouse names via batch Map lookup. API at GET /api/inventory/items/[id]/history wired to AssetService. 11 tests include full lifecycle test (RECEIVED to ISSUED to tech to RETURNED to ISSUED to sub to RETURNED to DISPOSED). |
| 3 | Expense records with amount/date/category/vendor auto-create double-entry JE with audit trail | VERIFIED | Expense model has amount (Decimal), expenseDate, categoryId, vendorId, createdById, journalEntryId fields. ExpenseService.postExpense creates balanced JE via JournalEntryService.createEntry with DR expense account (from category.accountCode) and CR cash/bank (from paymentMethod). AuditTrailService (169 lines) traces JE to creator, timestamp, and source referenceType/referenceId. 15 expense tests + 9 audit trail tests. |
| 4 | Income Statement for date range and Balance Sheet as of date, derived from JE lines | VERIFIED | FinancialReportService (557 lines) getIncomeStatement queries JE lines by REVENUE/EXPENSE account types within date range. getBalanceSheet queries JE lines for ASSET/LIABILITY/EQUITY up to asOfDate, computes Net Income inline. Both use journalEntryLine.groupBy with POSTED status filter. API routes wired to service. 16 tests verify correct amounts and date filtering. |
| 5 | Trial Balance with debits equal credits -- self-verifying | VERIFIED | FinancialReportService.getTrialBalance computes totalDebits and totalCredits from JE lines, returns isBalanced = equalsInCents(totalDebits, totalCredits). Tests explicitly assert isBalanced === true and totalDebits.equals(totalCredits). Empty tenant also verified balanced with zero totals. |
**Score:** 5/5 truths verified
### Required Artifacts
| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| src/lib/services/inventory-service.ts | Inventory event ledger | VERIFIED | 429 lines, no stubs, imported by 3 API routes + asset-service |
| src/lib/services/asset-service.ts | Asset lifecycle | VERIFIED | 449 lines, no stubs, imported by 4 API routes |
| src/lib/services/expense-service.ts | Expense tracking + JE | VERIFIED | 537 lines, no stubs, imported by 3 API routes |
| src/lib/services/vendor-service.ts | Vendor CRUD | VERIFIED | 149 lines, imported by 2 API routes |
| src/lib/services/expense-report-service.ts | Expense aggregation | VERIFIED | 214 lines, imported by 2 API routes |
| src/lib/services/audit-trail-service.ts | JE audit trail | VERIFIED | 169 lines, imported by API route |
| src/lib/services/financial-report-service.ts | Financial reports | VERIFIED | 557 lines, all from JE lines, imported by 4 API routes |
| prisma/schema.prisma models | Data models | VERIFIED | InventoryItem, StockMovement (no updatedAt), Expense, Vendor, ExpenseCategory all present |
| 28 API route files | REST endpoints | VERIFIED | All exist (10-99 lines each), import and call services, use withPermission |
| 5 test files | Integration tests | VERIFIED | 2,626 total lines, 64 tests across inventory/asset/expense/audit/financial |
### Key Link Verification
| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| InventoryService.recordMovement | JournalEntryService.createEntry | Direct call for RECEIVED | WIRED | DR 1200, CR 2010 with totalCost |
| AssetService.disposeAsset | JournalEntryService.createEntry | Direct call for disposal | WIRED | DR 5030, CR 1200 write-off |
| ExpenseService.postExpense | JournalEntryService.createEntry | Direct call, ref=Expense | WIRED | DR category account, CR cash/bank |
| FinancialReportService | journalEntryLine.groupBy | Prisma queries on POSTED JEs | WIRED | All 3 reports derive from JE lines |
| AuditTrailService | journalEntry queries | Prisma with createdBy, lines | WIRED | Returns creator, timestamp, source ref |
| All API routes | Service methods | import + call | WIRED | All 28 routes properly wired |
### Requirements Coverage
| Requirement | Status | Blocking Issue |
|-------------|--------|----------------|
| INV-01: Register hardware items | SATISFIED | -- |
| INV-02: Immutable stock movements | SATISFIED | -- |
| INV-03: Derived stock levels | SATISFIED | -- |
| INV-04: Asset assign to subscriber | SATISFIED | -- |
| INV-05: Asset assign to technician | SATISFIED | -- |
| INV-06: Asset history | SATISFIED | -- |
| EXP-01: Record expenses | SATISFIED | -- |
| EXP-02: Manage expense categories | SATISFIED | -- |
| EXP-03: Manage vendors | SATISFIED | -- |
| EXP-04: Expense reports | SATISFIED | -- |
| EXP-05: Expenses create JEs | SATISFIED | -- |
| ACCT-04: Income Statement | SATISFIED | -- |
| ACCT-05: Balance Sheet | SATISFIED | -- |
| ACCT-06: Trial Balance | SATISFIED | -- |
| ACCT-08: Full audit trail | SATISFIED | -- |
### Anti-Patterns Found
No TODO, FIXME, placeholder, or stub patterns found in any phase 4 service or API route file.
### Human Verification Required
#### 1. Stock Level Derivation Accuracy
**Test:** Register batch items, perform mixed movements (RECEIVED, ISSUED, RETURNED, DISPOSED), then check /api/inventory/stock-levels
**Expected:** Stock levels match expected quantities at each location
**Why human:** Complex aggregation logic; manual spot-check against real DB confirms correctness
#### 2. Full Asset Lifecycle Timeline
**Test:** Create serialized item, assign to technician, return, assign to subscriber, return, dispose. View /api/inventory/items/{id}/history
**Expected:** Chronological timeline with resolved names
**Why human:** Name resolution depends on actual subscriber/user records
#### 3. Financial Reports Cross-Consistency
**Test:** Create various transactions, generate all 3 reports
**Expected:** Trial Balance debits = credits; Income Statement net income matches Balance Sheet net income line
**Why human:** Cross-report consistency needs human verification with known data
### Gaps Summary
No gaps found. All 5 observable truths verified at all three levels (existence, substantive implementation, wiring). All 15 requirements satisfied. No stub patterns found. 64 integration tests across 5 test files cover all critical behaviors.
---
_Verified: 2026-03-05T12:00:00Z_
_Verifier: Claude (gsd-verifier)_