{
  "schema": "foreglass.ledger-archive-index/v1",
  "note": "Each dated file is an immutable historical ledger snapshot, cached forever (Cache-Control: immutable). This index itself is NOT immutable — it is regenerated on every image build and served no-cache, must-revalidate. Identify a build by its sha256, not its filename: a build-date label has previously disagreed with the bytes it named.",
  "source_pack_bytes": "not independently published — the underlying FRED/CBOE/Shiller series are linked from their landing pages only, not republished byte-for-byte here",
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}