- Fix shouldBillToday() month-wrapping logic for PREPAID lead days
- POST /api/billing/generate — triggers monthly invoice generation cycle
- GET /api/invoices — paginated list with status/subscriber/date filters
- GET /api/invoices/[id] — invoice detail with lines and subscriber
- POST /api/invoices/[id]/void — void with JE reversal
Test coverage (38 tests):
- computeBillingPeriod pure function
- shouldBillToday: postpaid, prepaid, and month-wrapping edge case
- Invoice number sequencing per tenant/year
- Invoice generation: amounts, InvoiceLine, period dates
- Journal entries: DR AR (1100), CR Revenue (4010), balanced
- Idempotency: duplicate prevention via unique(subscriberId, periodStart)
- Credit auto-application: full, partial, zero credit, JE (DR 1150, CR 1100)
- Billing cycle: active-only, suspended/cancelled excluded, prepaid lead days
- Overdue detection: bulk update of DRAFT/SENT/PARTIAL past due date
- Void: JE reversal, already-voided guard, PAID guard
- getInvoice, listInvoices, status filtering
- Tenant isolation: Tenant B cannot see Tenant A invoices
- GET/POST /api/accounting/journal-entries (list + create manual entry)
- GET /api/accounting/journal-entries/[id] (single entry with lines)
- POST /api/accounting/journal-entries/[id]/approve (maker-checker approval)
- POST /api/accounting/journal-entries/[id]/reverse (create reversing entry)
- GET /api/accounting/accounts/[id]/balance (derived balance, never stored)
- All routes use closure pattern over withPermission HOF (same as periods/close)
- Add startDate parameter to getAccountBalance for date range queries
- 36 integration tests: balance enforcement, closed period, immutability,
reversals, maker-checker, entry numbering, account balance derivation,
trial balance self-verification
- Total test suite: 198 tests all passing
- withSuperAdmin() HOF: checks isSuperAdmin from session, returns 401/403
- GET /api/admin/tenants: lists all tenants with userCount, subscriberCount
- GET /api/admin/tenants/[id]: single tenant detail with users list
- POST /api/admin/tenants/[id]/suspend: suspend/activate with 7-day grace
- prisma/seed.ts: add Test ISP 2 tenant and admin2@demo.com for isolation tests
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
