Studio ledger

The single record of what was generated, with what, from what, and what it cost. Every studio-* skill writes here; nothing else keeps a second opinion about spend.

Plain ESM, no dependencies — node:sqlite does the indexing, and the facts themselves are append-only JSONL so the index can be deleted and rebuilt at any time.

Layout

~/.studio/
  ledger/events-YYYY-MM.jsonl     append-only facts (the source of truth)
  ledger/assets-YYYY-MM.jsonl     content-addressed asset registrations
  index.sqlite                    disposable read model
  blobs/<sha256>                  the bytes, addressable by hash

Override the root with STUDIO_LEDGER_HOME or ledger_home in ~/.pontistudios.studio.yml.