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Files: - STACK.md - FEATURES.md - ARCHITECTURE.md - PITFALLS.md - SUMMARY.md Key findings: - Stack: Next.js 15 + TypeScript + PostgreSQL + Prisma monolith; BullMQ for billing cron jobs; MikroTik client needs library verification (LOW confidence) - Architecture: Modular monolith with shared-DB multi-tenancy; JournalEntryService as sole ledger gateway; derived financial state (no balance fields) - Critical pitfall: Cross-tenant data leakage + fake accounting + billing state machine must all be solved in Phase 1 before any feature work Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>