docs(04-03): complete expense tracking plan
Tasks completed: 2/2 - Task 1: Schema + COA additions + expense category seeding - Task 2: VendorService, ExpenseService, API routes, migration, 15 tests SUMMARY: .planning/phases/04-inventory-expenses-and-financial-reports/04-03-SUMMARY.md Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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kevin-asprec
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---
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phase: 04-inventory-expenses-and-financial-reports
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plan: 03
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subsystem: expenses, accounting
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tags: [expense-tracking, vendor-management, journal-entries, double-entry, approval-workflow, prisma]
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# Dependency graph
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requires:
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- phase: 02-subscriber-and-billing-core
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provides: "JournalEntryService, Chart of Accounts, accounting period management"
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- phase: 01-foundation
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provides: "Tenant provisioning, CASL permissions, withTenantContext"
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provides:
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- "Vendor model and VendorService (CRUD)"
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- "ExpenseCategory model with 9 pre-seeded ISP categories"
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- "Expense model with ExpenseService (create, approve, post, void)"
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- "Automatic JE posting on expense post (DR expense account, CR cash/bank)"
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- "Optional approval workflow (DRAFT -> APPROVED -> POSTED)"
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- "API routes for expenses, categories, and vendors"
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- "COA accounts 5080 Fuel/Transportation, 5085 Rent Expense (31 total)"
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affects: [04-05-financial-reports, 05-dashboard]
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- "Expense JE pattern: DR category.accountCode, CR 1010/1020 based on paymentMethod"
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- "Optional approval workflow via requireApproval flag"
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- "ExpensePaymentMethod enum determines CR account (CASH->1010, BANK_TRANSFER/CHECK->1020)"
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key-files:
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created:
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- "src/lib/services/expense-service.ts"
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- "src/lib/services/vendor-service.ts"
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- "src/app/api/expenses/route.ts"
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- "src/app/api/expenses/[id]/route.ts"
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- "src/app/api/expenses/[id]/approve/route.ts"
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- "src/app/api/expenses/categories/route.ts"
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- "src/app/api/expenses/categories/[id]/route.ts"
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- "src/app/api/vendors/route.ts"
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- "src/app/api/vendors/[id]/route.ts"
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- "src/lib/__tests__/expense-service.test.ts"
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- "prisma/migrations/20260305_add_expense_vendor_models/migration.sql"
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modified:
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- "prisma/schema.prisma"
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- "src/lib/tenant.ts"
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- "src/lib/accounting/chart-of-accounts.ts"
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- "src/lib/casl/types.ts"
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- "src/lib/casl/permissions.ts"
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key-decisions:
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- "ExpensePaymentMethod determines CR account: CASH->1010, BANK_TRANSFER/CHECK->1020"
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- "Default behavior is immediate post (no approval required); requireApproval flag enables DRAFT-only creation"
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- "System expense categories (isSystemCategory=true) cannot be deleted; custom categories can be deleted if no expenses reference them"
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- "Vendor subject added to CASL types; OFFICE_STAFF gets manage permissions for Expense and Vendor"
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- "COA now has 31 accounts (added 5080 Fuel/Transportation, 5085 Rent Expense)"
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- "Expense cleanup order: expenses -> vendors -> expenseCategories (non-system) -> journalEntryLines -> null reversesEntryId -> journalEntries -> accountingPeriods -> accounts -> ticketCategories -> expenseCategories (system) -> users -> tenant"
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patterns-established:
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- "Expense JE: DR category expense account (from accountCode), CR cash/bank account"
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- "Optional approval workflow pattern: requireApproval flag on create, approveExpense triggers post"
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- "Category-to-COA linking via accountCode field on ExpenseCategory"
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# Metrics
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duration: 17min
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completed: 2026-03-05
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---
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# Phase 4 Plan 3: Expense Tracking Summary
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**Expense tracking with vendor management, 9 pre-seeded categories, optional approval workflow, and automatic double-entry JE posting on every expense**
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## Performance
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- **Duration:** 17 min
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- **Started:** 2026-03-05T02:35:00Z
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- **Completed:** 2026-03-05T02:52:00Z
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- **Tasks:** 2
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- **Files modified:** 16
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## Accomplishments
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- Full expense lifecycle: create, approve, post, void with JE integration
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- 9 default ISP expense categories seeded at tenant creation (bandwidth, equipment, salary, etc.)
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- Vendor CRUD with unique name per tenant
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- Every posted expense creates balanced JE (DR expense account from category, CR cash/bank)
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- Optional approval workflow (DRAFT -> APPROVED -> POSTED when enabled)
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- 15 integration tests covering all expense scenarios
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Schema + COA + category seeding** - `fe4d22f` (feat)
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2. **Task 2: Services, API routes, migration, tests** - `b7bbc50` (feat)
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## Files Created/Modified
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- `prisma/schema.prisma` - Added Vendor, ExpenseCategory, Expense models + enums
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- `src/lib/tenant.ts` - Added expense category seeding in createTenant transaction
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- `src/lib/accounting/chart-of-accounts.ts` - Added 5080, 5085 expense accounts (31 total)
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- `src/lib/casl/types.ts` - Added Vendor subject
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- `src/lib/casl/permissions.ts` - Added Expense/Vendor permissions for OFFICE_STAFF
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- `src/lib/services/vendor-service.ts` - VendorService: create, update, list, get
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- `src/lib/services/expense-service.ts` - ExpenseService: create, approve, post, void, list, categories CRUD
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- `src/app/api/expenses/route.ts` - POST/GET expense endpoints
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- `src/app/api/expenses/[id]/route.ts` - GET expense detail
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- `src/app/api/expenses/[id]/approve/route.ts` - POST approve expense
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- `src/app/api/expenses/categories/route.ts` - GET/POST expense categories
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- `src/app/api/expenses/categories/[id]/route.ts` - PUT expense category
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- `src/app/api/vendors/route.ts` - GET/POST vendor endpoints
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- `src/app/api/vendors/[id]/route.ts` - GET/PUT vendor detail
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- `src/lib/__tests__/expense-service.test.ts` - 15 integration tests
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- `prisma/migrations/20260305_add_expense_vendor_models/migration.sql` - DB migration
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## Decisions Made
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- ExpensePaymentMethod determines CR account: CASH -> 1010 Cash on Hand, BANK_TRANSFER/CHECK -> 1020 Cash in Bank
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- Default behavior is immediate post (requireApproval=false); when enabled, expense stays DRAFT until approved
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- System expense categories protected from deletion; custom categories deletable only if no expenses reference them
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- Added Vendor as a new CASL subject (separate from Expense) for granular permissions
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- COA expanded to 31 accounts with Fuel/Transportation (5080) and Rent Expense (5085)
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 2 - Missing Critical] Added Vendor to CASL types and OFFICE_STAFF permissions**
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- **Found during:** Task 1 (Schema + permissions)
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- **Issue:** Plan specified API routes for vendors with ADMIN/OFFICE_STAFF access, but Vendor was not in AppSubjects and OFFICE_STAFF had no Expense/Vendor permissions
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- **Fix:** Added "Vendor" to AppSubjects type, added can("manage", "Expense") and can("manage", "Vendor") for OFFICE_STAFF role
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- **Files modified:** src/lib/casl/types.ts, src/lib/casl/permissions.ts
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- **Verification:** API routes compile with correct permission checks
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- **Committed in:** fe4d22f (Task 1 commit)
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---
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**Total deviations:** 1 auto-fixed (1 missing critical)
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**Impact on plan:** Essential for API route authorization. No scope creep.
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## Issues Encountered
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- Docker exec commands were unresponsive; switched to `DATABASE_URL_LOCAL` with `prisma db push` for migration (same result, different approach)
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- Expense tracking complete, all costs hit the double-entry ledger automatically
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- Financial reports in 04-05 can now include expense data alongside revenue
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- Ready for 04-04 (if exists) or 04-05 Financial Reports
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---
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*Phase: 04-inventory-expenses-and-financial-reports*
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*Completed: 2026-03-05*
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