Jelena manages everything from a mobile-first admin panel: pending referrals in one tab, clients and balances in the other. Codes, referrers and credits live in Supabase, QR codes are generated on the fly, and every email (welcome with the personal link, confirmation when a tattoo is done) goes out automatically through Resend. A monthly job reminds anyone whose credit expires within two months, so nothing quietly runs out while Jelena is tattooing.