React + Supabase + n8n Developer: Admin Dashboard & Workflow Automation

We are Ivory Nexus Solutions, a tech company based in Abidjan, Côte d'Ivoire. Our product, RecuAI, is a bilingual (EN/FR) WhatsApp assistant that uses AI to track business expenses for professionals and SMEs in Francophone Africa. The production stack is already in place: self-hosted n8n, Supabase (PostgreSQL with business logic in database functions), Twilio WhatsApp, AI extraction via the Claude and Gemini APIs, and a React user dashboard. We now need an internal system admin dashboard so our team can monitor the platform and manage plans without going through n8n, plus the n8n workflow changes that support it. SCOPE - PHASE A 1. Reporting (read-only), with date-range filters (today, week, month, custom): - Users by status (active, banned, limit reached, deleted, pending privacy, plan expired) - Users per plan (Free, Standard, Pro, including Pro groups and members) - Expenses submitted over time - AI API usage (Claude and Gemini calls) - Payments collected (by plan, method and period) 2. Plan management: - Admin can upgrade or renew a user's plan from the dashboard (replacing the current n8n admin flow) - Support for free promotions and manual payments (e.g.