Application groups match the portal's own grouping (Daily Workflow / Reference / Educational / External Resources). Not every app consumes every upstream store — TaxationOfTreasuries is static reference content with no live data pipeline; FundHoldings fetches its primary holdings data (Vanguard/fminvest, dashed above) via a manually-run script committed directly to the repo rather than the shared Ingestion → R2 pipeline (it does still read R2 for yield enrichment); the After-Tax Calculator is a third-party tool with no data flow from this system at all. See each app's own spec for exact data dependencies.