ChartMogul?

Build a focused replacement for ChartMogul for an owner of one website or product, based on this public product description: “Subscription Analytics | ChartMogul — ChartMogul calculates all of your core SaaS metrics by importing, cleaning and analyzing data from your billing sources – and then renders them in beautiful, customizable dashboards and charts.” Do not copy the original brand, proprietary assets, name, logo, UI, or copy; create an original visual system.

Core workflow
- Recreate only the narrow primary workflow described above, with collect only the minimum events needed for the stated report; show time-filtered totals, breakdowns, and a clear aggregation definition; include export, retention, deletion, and an inspectable tracking snippet; make sampling, delay, and missing-data states visible.
- Keep the product name and source description in a research note in the README, and turn every uncertain behavior into an explicit assumption or user setting rather than inventing a feature.
- Use a small React/TypeScript app with a portable JSON or SQLite data model, clear loading/empty/error states, and adapters around external services. Seed realistic demo data so the complete workflow works without paid credentials.

Scope boundaries
- Out of scope for v1: session replay; cross-site identity or ad profiles; individual surveillance and compliance certification. Do not promise feature parity, proprietary data, or enterprise reliability.

Include a README with setup, environment variables, data model, implementation decisions, privacy behavior, testing instructions, and important limitations.