Datalake Change Dashboard

Last updated: 2025-11-28 • Branch: cursor/datalake-recent-changes-dashboard-gpt-5.1-codex-78c7

Keep a single page view of what changed across the ingest pipeline, runtime, and experience layers of the Graviton datalake.

Executive Snapshot

Pillar	Status	Evidence	Impact
Baseline health	✅ Green	Phase 0 in docs/logs/2025-11-06.md captured clean TESTCONTAINERS=0 ./sbt scalafmtAll test and npm run docs:build.	CI inputs are reproducible; no hidden drift before new datalake work lands.
Type & attribute foundations	🚧 In progress	Phase 1 notes in docs/logs/2025-11-06.md detail new Iron-based ByteConstraints, opaque Block wrappers, and fresh specs.	Upload manifests now enforce sized blocks, with remaining interop helpers still tracked.
Reliability & observability	✅ Hardened	CHANGES_SUMMARY.md documents JVM memory caps, forked tests, digest fixes, and the resolution of 118/118 suites.	Long-running ingest jobs no longer OOM; test signal is trustworthy when evaluating pipeline regressions.
Experience & surfacing	✅ Live	FINAL_STATUS.md confirms the Laminar-powered dashboard (Stats Panel, Blob Explorer, Health Check) shipping with docs and CI wiring.	Product leaders can showcase datalake state directly in the published site while backend work evolves.

Recent Highlights

Ingest & Type Safety

• Restored Byte/Chunk refinements, BlockBuilder, and manifest-safe attributes per Phase 1 (docs/logs/2025-11-06.md).
• Added ByteConstraintsSpec and BlockSpec, giving regression coverage for size limits before they reach storage APIs.
• Extended docs/ingest/chunking.md to explain the new opaque wrappers and when to coerce legacy chunkers.

Runtime Reliability & Tests

• Locked JVM memory budgets (2 GiB max / 512 MiB min), G1 GC, and per-suite forks, eliminating prior OOM + clock issues (see CHANGES_SUMMARY.md).
• Trimmed property-test sample sizes and data payloads, keeping ingest stress cases realistic while fitting within CI timeboxes.
• Digest handling bugs were patched, so multi-algorithm verification (SHA-256 + BLAKE3) in the datalake no longer leaks buffers.

Experience & Insight Surfaces

• Scala.js frontend publishes a Stats Panel, Blob Explorer, and Health Check so stakeholders can inspect live datalake metrics (FINAL_STATUS.md).
• Docs theme overhaul (Matrix neon) keeps the dashboard discoverable: docs/.vitepress/config.ts, theme/index.ts, and custom.css now highlight Guide, Architecture, API, Scala.js, and Demo entry points (summarised in CHANGES_SUMMARY.md).
• Documentation build + deployment instructions (DOCUMENTATION_STATUS.md) ensure the dashboard can be previewed locally or via GitHub Pages.

Change Stream (last 30 days)

Date	Area	Update	Impact	Source
2025-11-06	Tooling baseline	Reconfirmed clean repo state, ran TESTCONTAINERS=0 ./sbt scalafmtAll test, and rebuilt docs via npm as Phase 0 acceptance.	Guarantees future datalake patches start from a reproducible baseline.	docs/logs/2025-11-06.md
2025-11-06	Ingest types	Added Iron ByteConstraints, opaque Block/UploadChunk, refreshed specs, and updated chunking docs (Phase 1 progress).	Enforces per-block safety before data touches BlockStore/BlobStore implementations.	docs/logs/2025-11-06.md
2025-10-30	Docs infrastructure	Verified SBT + VitePress builds, outlined structure, and documented commands/endpoints.	Contributors can confidently regenerate the dashboard + docs site.	DOCUMENTATION_STATUS.md
—	Reliability fixes	JVM tuning, digest leak fix, forked suites, and dead-link-free cyberpunk docs theme.	118/118 tests pass; ingest simulations no longer hang or exhaust heap.	CHANGES_SUMMARY.md
—	Experience layer	Delivered Laminar/Airstream dashboard modules, Scaladoc publishing, and CI wiring for GitHub Pages.	Provides a live datalake cockpit (Stats, Blob Explorer, Health) tied to every deploy.	FINAL_STATUS.md

Health Indicators

Build & Test

Check	Command	Expected Result
Format + unit/integration suites	TESTCONTAINERS=0 ./sbt scalafmtAll test	All suites green (~75s) with bounded heap (per CHANGES_SUMMARY.md).
Docs site	cd docs && npm install && npm run docs:build	Neon VitePress build succeeds without dead-link warnings (per docs/logs/2025-11-06.md).
Frontend artifacts	./sbt buildFrontend && cd docs && npm run docs:dev	Scala.js bundle compiles; demo route exposes dashboard (FINAL_STATUS.md).

Operational Confidence

• Metrics Surface: Stats Panel highlights blob counts, storage usage, dedupe ratio, and health indicators (see modules/frontend/README.md via FINAL_STATUS.md).
• Docs Accuracy: Schema, chunking, ranges, and ingest guides tracked in DOCUMENTATION_STATUS.md remain in sync with current modules.
• Navigation: Top-level nav exposes Guide → Streaming → Architecture → API → Scala.js → Demo, keeping the dashboard just one click away (per docs/.vitepress/config.ts).

Upcoming Focus

• Finish Phase 1 by documenting the new helpers and wiring additional BinaryAttribute interop (from docs/logs/2025-11-06.md).
• Kick off Phase 2 extraction of FastCDC + rolling hash chunkers and the selection heuristics referenced in the log’s workstreams.
• Prepare the mime sniffer design doc + module skeleton so Phase 3 can attach hints to the ingest dashboard metrics.
• Sketch mdoc integration (Phase 7) so dashboard snippets stay executable before larger doc merges land.

Source Index

• docs/logs/2025-11-06.md — Phase-by-phase migration log and acceptance checks.
• CHANGES_SUMMARY.md — Reliability hardening + Matrix-themed docs upgrades.
• DOCUMENTATION_STATUS.md — Build verification and site structure snapshot.
• FINAL_STATUS.md — Scala.js dashboard / frontend deliverables and CI wiring details.

API Integration

• GET /api/datalake/dashboard now returns a DatalakeDashboardEnvelope that includes the live snapshot plus a metaschema generated via Schema[DatalakeDashboard].ast. Clients can diff the AST to detect contract changes.
• GET /api/datalake/dashboard/stream exposes a server-sent-event feed powered by a ZIO Hub + ZStream, allowing the Scala.js demo (and any other consumer) to stay in sync without polling.
• The metaschema uses the zio-schema-json codec so downstream tooling can hydrate the AST into whatever representation they need.
• The response also ships a schemaExplorer graph derived from Schema.makeAccessors, giving UIs enough structure to build interactive editors or schema visualizations without bespoke wiring.

Interactive Editing & Accessors

• The /demo#/updates route now renders editable string fields straight from the schema-derived accessors. Every input is produced by traversing the Schema[DatalakeDashboard] structure—no hand-maintained forms.
• When the dashboard loads data (or receives SSE updates) the editor state synchronizes automatically; you can tweak values locally and click Apply edits to mutate the in-browser snapshot. It’s a proof-of-concept for moving “functions to the data” where the schema itself drives the editing experience.
• For richer tooling, the frontend also exposes a graviton-schema custom element (and an inline Laminar SchemaExplorerView) so other docs/pages can embed live schema explorers backed by the same accessor metadata. A live instance is embedded below.

Configure API for docs

Update the <meta name="graviton-api-url" /> tag above so the embedded explorer knows where to fetch /api/datalake/dashboard.