chore: delete the v3 tree now that v3 is decommissioned (#7)

The v3 generation was fully decommissioned on 2026-07-08: monorepo PR
vortex-data/vortex#8683 removed the v3 ingest steps and made the v4
Postgres ingest required, and the EC2 host, its S3 backups, and its
IAM/SG resources were deleted. This removes the code that served it:
server/ (the axum ingest/read server), migrate/ (the v2->v3->v4
migrator, whose backfill job finished on 2026-07-07), ops/ (the host
deploy scripts), the Cargo workspace, the Rust CI workflow, and the
v3 runbooks.

The measurement_id hash contract the Rust server owned moves to the
monorepo: the golden vectors and a Python pin test now live there
(vortex-data/vortex#8687), so scripts/measurement_id_golden.json is
deleted here and web/lib/schema-version.test.ts drops its
server/src/schema.rs anchor, making web/lib/schema-version.ts the
in-repo source of truth. Docs are updated to describe the single v4
ingest path and to mark the v3 sections as historical.

Signed-off-by: Connor Tsui <connor.tsui20@gmail.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: connortsui20

.github/workflows/rust-ci.yml

@@ -5,82 +5,51 @@ SPDX-FileCopyrightText: Copyright the Vortex contributors
 
 # AGENTS.md - `benchmarks-website/`
 
-Read [`README.md`](README.md) first for the architecture. Then this file. The
-root [`CLAUDE.md`](../CLAUDE.md) covers Rust style, test layout, commit
-conventions. Everything about the legacy generations (v2, v3) is in
-[`docs/legacy.md`](docs/legacy.md).
-
-## The legacy v2 site
-
-The v2 Vite/React site is retired from serving (`bench.vortex.dev` now points at
-v4) and was deployed from elsewhere — its source never lived in this repo. The
-migrator still reads the v2 S3 dump as its historical source (see
-[`migrate/README.md`](migrate/README.md)).
-
-The v3 deploy lives entirely under `server/`, `migrate/`, and `ops/`.
-The operator runbook is [`ops/README.md`](ops/README.md).
-
-## v3 specifics
-
-- **Wire shapes are a coordinated change.** [`server/src/records.rs`](server/src/records.rs),
-  [`vortex-bench/src/v3.rs`](../vortex-bench/src/v3.rs), and (until cutover)
-  [`migrate/src/classifier.rs`](migrate/src/classifier.rs) must agree.
-  Bumping a shape means changing all three plus the snapshot fixtures in
-  one commit. `SCHEMA_VERSION` is the version literal coupled across
-  [`server/src/schema.rs`](server/src/schema.rs) (in-repo source of
-  truth), [`web/lib/schema-version.ts`](web/lib/schema-version.ts) (the
-  in-repo web mirror), and [`scripts/post-ingest.py`](../scripts/post-ingest.py)
-  (the monorepo CI ingest wrapper, which hardcodes it as a Python literal); a
-  bump also coordinates with the monorepo producer wire shape in
-  `vortex-bench/src/v3.rs`. Bump in lockstep or every CI ingest run 400s/409s
-  (400 if the server is ahead, 409 if the emitter is ahead). The server-side validation in
-  `records.rs` + `ingest.rs` and the echo in `/health` all consume the
-  constant through `crate::schema`. The full versioned contract lives in
-  [`CONTRACT.md`](CONTRACT.md).
-- **Numeric `?n=` is clamped to 1000; `?n=all` is the uncapped escape
-  hatch.** HTML routes hydrate from the materialized latest-100 shard
-  artifact by default; `?n=all` is an explicit opt-in
-  (chart-init.js's full-history zoom-out hop uses it once, and curl
-  power users can request it). The numeric `?n=` path is bounded by
-  `MAX_NUMERIC_COMMIT_WINDOW` in [`server/src/api/window.rs`](server/src/api/window.rs)
-  as a DoS-protection floor against `curl ...?n=99999999`. If you need
-  full history, use `?n=all`. Do NOT raise the numeric cap or remove it
-  without thinking about the DoS surface.
-- **`measurement_id` is server-internal.** Never put it on the wire. It is
-  a deterministic hash over `commit_sha` plus the dim tuple, computed in
-  [`server/src/db.rs`](server/src/db.rs) and reused by the migrator via
-  the same crate.
-- **Don't write a server-side classifier for live ingest.** The emitter
-  produces v3-shape records directly; the migrator's classifier only
-  exists to translate v2 records once and goes away after cutover.
-- **Don't reach for WASM.** SSR + a thin hydration script in
-  [`server/static/chart-init.js`](server/static/chart-init.js) is the
-  whole client.
-- **v3 ingest is no longer best-effort in CI.** The `Ingest results to v3
-  server` step in [`bench.yml`](../.github/workflows/bench.yml),
-  [`sql-benchmarks.yml`](../.github/workflows/sql-benchmarks.yml), and
-  [`v3-commit-metadata.yml`](../.github/workflows/v3-commit-metadata.yml)
-  no longer carries `continue-on-error: true`. A v3-server outage on a
-  develop push now fails the bench workflow and triggers the existing
-  `incident.io` alert. The gate is `vars.V3_INGEST_URL != ''` so forks
-  and unconfigured environments are unaffected.
-- **Don't re-introduce a server-side commit cap on `?n=all`.** `?n=all`
-  is the uncapped escape hatch (chart-init.js fetches it once for the
-  zoom-out path); visual downsampling happens client-side via LTTB on
-  the visible commit range only. Numeric `?n=` is clamped per the bullet
-  above. Default fetches from chart-init.js use the materialized
-  latest-100 shard artifact, not `?n=all`.
-- **Don't refetch on every scope change.** Once a chart's payload is in
-  memory, pan/zoom/slider/range-strip all rebuild in place via the
-  in-memory LTTB pass on the cached payload. The single exception is the
-  latest-100 to full-history zoom-out path: charts initially hydrate from
-  the materialized latest-100 group shard artifact (served from
-  `/api/artifacts/{generation}/groups/{slug}/shards/{i}`); when the user
-  zooms past that window for the first time, `chart-init.js` lazy-fetches
-  `?n=all` once and replaces the latest-100 payload in place.
+Read [`README.md`](README.md) first for the architecture. Then this file. The web app has its own
+deep-dive in [`web/README.md`](web/README.md).
+
+## The legacy generations
+
+The previous site generations (v2 and v3) are documented in [`docs/legacy.md`](docs/legacy.md).
+The v3 Rust tree (`server/`, `migrate/`, `ops/`, the Cargo workspace) has been deleted from the
+working tree; recover it from git history if ever needed. Do not resurrect it piecemeal — the
+rules below are the parts that were worth keeping.
+
+## Load-bearing rules
+
+- **`SCHEMA_VERSION` is a coordinated cross-repo change.**
+  [`web/lib/schema-version.ts`](web/lib/schema-version.ts) is the in-repo source of truth; the
+  monorepo's `scripts/post-ingest.py` hardcodes the same integer, and its `vortex-bench/src/v3.rs`
+  owns the producer wire shape. Bump in lockstep across both repos. The versioned contract lives
+  in [`CONTRACT.md`](CONTRACT.md), and
+  [`web/lib/schema-version.test.ts`](web/lib/schema-version.test.ts) asserts the in-repo anchors
+  agree.
+- **`measurement_id` is internal — never on the wire.** It is a deterministic xxhash64 over
+  `commit_sha` plus the dim tuple, computed by the monorepo's `scripts/_measurement_id.py` just
+  before INSERT and used as the `ON CONFLICT` upsert key. Its output is frozen forever: the
+  monorepo's golden-vector test (`scripts/tests/test_measurement_id.py`) pins it, because a
+  drifted hash would insert duplicates next to the rows already in production.
+- **Numeric `?n=` is clamped to 1000; `?n=all` is the uncapped escape hatch.** Pages hydrate from
+  the materialized latest-100 shard artifact by default; `?n=all` is an explicit opt-in (the
+  chart's full-history zoom-out hop uses it once, and curl power users can request it). The
+  numeric path is bounded by `MAX_NUMERIC_COMMIT_WINDOW` in
+  [`web/lib/window.ts`](web/lib/window.ts) as a DoS-protection floor against `?n=99999999`. Do
+  NOT raise the numeric cap or remove it without thinking about the DoS surface, and do NOT
+  re-introduce a server-side commit cap on `?n=all` — visual downsampling happens client-side via
+  LTTB on the visible commit range only.
+- **Don't refetch on every scope change.** Once a chart's payload is in memory,
+  pan/zoom/slider/range-strip all rebuild in place via the in-memory LTTB pass on the cached
+  payload ([`web/components/Chart.tsx`](web/components/Chart.tsx)). The single exception is the
+  latest-100 to full-history zoom-out path: when the user first zooms past the materialized
+  window, the chart lazy-fetches `?n=all` once and replaces the payload in place.
+- **Don't write a server-side classifier for live ingest.** The emitter produces structured
+  records directly. Classifying loose name strings at read time was the v2-era weakness every
+  later generation existed to escape; it belongs nowhere in the live pipeline.
 
 ## Footguns we have already hit
 
+All in [`web/components/Chart.tsx`](web/components/Chart.tsx):
+
 - **Reverse predecessor walk in the tooltip.** `payload.commits[]` is
   sorted oldest-first by SQL - `commits[0]` is the oldest, `commits[N-1]`
   is the newest. For per-row delta the predecessor of `commits[idx]` is
@@ -96,25 +65,11 @@ The operator runbook is [`ops/README.md`](ops/README.md).
 ## Local dev
 
 ```bash
-# Public-only run (read API + ingest only, admin routes 404):
-INGEST_BEARER_TOKEN=dev cargo run -p vortex-bench-server
+# The web app needs BENCH_DB_* env vars for a real database — see web/README.md.
+cd web && pnpm install && pnpm dev
 
-# With admin endpoints mounted on a separate loopback listener:
-INGEST_BEARER_TOKEN=dev ADMIN_BEARER_TOKEN=dev \
-  cargo run -p vortex-bench-server
-
-cargo nextest run -p vortex-bench-server -p vortex-bench-migrate
-INSTA_UPDATE=auto cargo nextest run -p vortex-bench-server   # update snapshots
+pnpm test        # vitest unit tests
+pnpm build       # deliberately works without a database, so CI needs no secrets
 ```
 
-For the full env-var contract (admin bind, snapshot dir, extension dir,
-logging spec, PaaS `PORT` fallback) see [`ops/config/vortex-bench.env.example`](ops/config/vortex-bench.env.example)
-and the lib-level `//!` doc on [`server/src/main.rs`](server/src/main.rs).
-
-For the migrator end-to-end against the real S3 dump:
-
-```bash
-cargo run -p vortex-bench-migrate -- run --output ./bench.duckdb
-VORTEX_BENCH_DB=./bench.duckdb INGEST_BEARER_TOKEN=dev \
-  cargo run -p vortex-bench-server
-```
+For the full env-var contract see [`web/README.md`](web/README.md).