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Step 9. The tier split was the work; Django was the easy half.
Tier 1 — the authored scene — is the document, and it is addressed as
independently versioned leaves rather than saved whole, so one vertex drag
cannot clobber a collaborator's keying. `domain/leaf` is the document as
path -> value; `domain/wire` puts it on the wire as transit, because JSON
has neither integer map keys nor keywords and a save would quietly turn
`{0 v}` into `{"0" v}`.
Tier 2 — the dense channel blocks — is content-addressed by a hash over
every input, with the detector version inside every key through the
analysis the block descriptor names. `flow/address`'s `block-knobs` is the
invalidation table, and `address-test` does not trust it: it re-freezes the
take once per knob and asserts the biconditional, that a block's bytes
changed if and only if its key changed. That found `brow-pos` not depending
on `contour-avg` — the brow ring is smoothed, the raise is not.
Tier 3 — frames and audio — is served by the hash of its bytes out of the
same store. A manifest now names frames and carries a URL for each, so the
frame layout stopped being a shared secret between a shell script and a
ClojureScript namespace, and the `?v=` cache-buster went with it: a blob's
name is the hash of its contents, so a stale copy is not a thing that can
happen. The synthetic take's `audio.wav` moved to `static/arthur/` — an
asset the project owns, not an extraction that churns.
The server verifies rather than trusting a name it was handed: it
recomputes every key from the descriptor stored beside it, refuses an
analysis that declares no detector version, and refuses a document naming
blocks it does not hold. It hashes the descriptor TEXT, because JS prints
an integral double as `1` and Python as `1.0`, and a scheme where both ends
re-render the numbers disagrees on the first parameter that happens to be
whole.
Two loose ends from step 8 closed on the way. `pack` no longer takes a
`(track, frame)` predicate whose call sites each re-derived a feature from
an index — every track names the feature it follows, which deleted five
hand-maintained mappings. And `:dev-http` is gone: Django serves the page,
shadow-cljs only builds into the staticfiles tree.
227 CLJS tests, 31 Django tests, green.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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# extract.sh's output. It is TIER 3 — immutable, large, and the backend's to serve
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# once `manage.py ingest_bundle` has hashed it into var/blobs — so none of it
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# belongs in the repo. `audio.wav` was tracked before step 9 because the synthetic
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# take borrowed it for a clock; that copy now lives at static/arthur/audio.wav,
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# which is an asset the project owns rather than an extraction that churns.
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frames/
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/audio.wav
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/manifest.json
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# local extracted takes for comparing source cadences
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/scratch/
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*.task
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*.take
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*.tflite
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# CLJS build
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frontend/node_modules/
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# screenshots from the browser suite; regenerated by `npm run browser`
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frontend/test/browser/out/
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frontend/.shadow-cljs/
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frontend/out/
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frontend/.cpcache/
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static/arthur/js/
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# mise-managed venv for the Django half
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.venv/
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# the Django half's own state: the document database, the content-addressed blob
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# store (tiers 2 and 3), and collectstatic's output
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db.sqlite3
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/var/
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# vim swap files
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*.swp
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# Python bytecode
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__pycache__/
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*.py[cod]
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