FlowAnalytics

A multi-tenant SaaS analytics dashboard: workspaces with roles, Stripe subscription billing, revenue and customer analytics, CSV reports, audit logs and API keys.

Every B2B SaaS needs the same unglamorous foundations before its first customer: tenancy, billing, access control and an audit trail. The goal was to build those properly once, on a realistic product, rather than bolt them on later.

• A workspace-scoped Prisma schema: customers, revenue events, notifications, API keys and audit entries all belong to a workspace, with cascade deletes and Owner / Admin / Member roles.
• Stripe Checkout for Free, Pro and Enterprise plans. Webhooks are signature-verified and upsert the subscription by its Stripe ID, so a retried event can't create a duplicate.
• NextAuth v5 with email/password and Google OAuth, plus a route proxy that redirects signed-out users and gates the dashboard behind onboarding.
• Revenue, growth and funnel charts in Recharts, and CSV exports of customers and revenue.
• Audit log and in-app notifications for billing and workspace events; transactional email via Resend.

• Next.js 16
• TypeScript
• PostgreSQL
• Prisma
• NextAuth
• Stripe
• Recharts
• Resend

• ✺Multi-tenant billing, roles and audit logs

• API routes skip the proxy and each enforce auth themselves. A shared workspace-guard wrapper would make a missed check impossible rather than merely unlikely.
• The CSV export wraps cells in quotes but doesn't escape embedded quotes or formula characters; it should use a proper CSV writer.