The F1 feed sends TimingAppData stints as sparse deltas keyed by stint
index — a mid-stint update is just {"1": {"TotalLaps": 14}}. The parser
replaced the whole stint slice with whatever a delta carried, so pit
history collapsed to a single entry and tyre age was pinned near zero for
the entire race. A partial delta was also dropped outright, because the
parser required a Compound field that mid-stint updates do not send.
Observed live at lap 49 of the 70-lap 2026 Hungarian GP: all 22 drivers
reported exactly one stint with age 0 or 3, after most had pitted twice.
With the fix, the same feed at lap 51 yields 3 stints for 15 drivers and
2 for 6, ages spread 1-30 — e.g. car 1 as MEDIUM 17 / HARD 22 / HARD 11.
Stints now merge by index, and Compound, New and TotalLaps each apply only
when the delta actually carries them.
Also stop folding non-numeric keys into index 0 in indexedRawValues. The
feed's "_kf" key-frame marker parsed as 0 and overwrote the first entry;
only the CurrentTyres path guarded against it, leaving the other five
callers exposed.
This feeds the tyre column, the deg model, stint history and the pit
window, all of which were reading near-zero tyre age all race.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The tyre deg panel expanded by default during races and rendered a
placeholder row per driver until enough clean laps existed to fit a
degradation model. For the first third of a race that was ~525px of
'warming up' rows above the Timing Tower, pushing the tower — the thing
the page exists for — off the fold entirely.
The panel now opens when it has something to say rather than because the
session is a race, and says 'collecting clean laps' while it waits. A
reader who toggles it keeps their choice.
Also:
- Hoist degradationModel into a memo shared by the readiness check and the
rows. It is O(laps) per driver and previously re-ran on every render at
feed rate.
- Order the side rail most-synthesized to most-raw, so a reader arriving
mid-session gets 'what just happened' before the regulatory log.
- Fade the trailing edge of the nav below 560px. It scrolls with a hidden
scrollbar, so the cut-off item read as a clipping bug rather than as
scrollable.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Backend-only re-cut of the #76 availability work onto main, stacked on the
canonical Weekend Context API. Adds request-scoped freshness reporting so
aggregate responses cannot report fresh when a component is stale, plus
local-first driver summary resolution and cache/pacing truth.
The frontend half of #76 is deliberately excluded: it is built on the
Weekend shell that failed owner review, including the full-width Partial
banner treatment. Availability presentation is re-cut with the shell in #89.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Reproduces the production shape from the v0.4.0 release blocker: a run
British race and an unrun Belgian race two weekends apart, both carrying
result rows. Analysis must resolve to the race that actually happened.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Clamp active-chapter detection to the same scrub bounds as chapter clicks,
keep an explicit selection on click for out-of-window timestamps, point E2E
at the empty-state card, and move Race Story empty-state styles out of app.css.
Co-authored-by: Cursor <cursoragent@cursor.com>
Consolidate the Race Story section into a cohesive timeline surface: custom
chapter-strip scrolling with active-card sync, unified segmented playback
controls, chapter bands on the position graph with decimated axes and
de-collided labels, map toggle gated by an on-mount replay/outline probe,
and shared empty-state cards. Adds vitest coverage and visual snapshots.
Note: replay/outline queries now probe on mount (not only when Map opens) so
the toggle can be hidden before users hit a dead panel.
Co-authored-by: Cursor <cursoragent@cursor.com>
Generate deterministic template headlines server-side for each replay chapter
kind, expose Chapter.headline in the race-hub payload, and render a horizontal
chapter strip on the story view with active-chapter highlighting, click-to-jump,
and a 90-second tour mode built on the existing scrubber playback.
Co-authored-by: Cursor <cursoragent@cursor.com>
Spike: replay location fan-out is bounded with a semaphore at 4 concurrent GetLocation calls, covered by TestAssembleReplayFramesBoundsLocationFanOut.
Adds /api/v1/replay/frames with 5s interval floor, 3000-frame cap, nearest-sample snapping, and empty-driver omission. Wires RaceStoryCanvas to lazy-load replay frames plus cached track outlines when the map panel opens, sharing the existing scrubber/playback state across chart and map.
Tests: HOME=/private/tmp/box-box-home GOCACHE=/private/tmp/box-box-go-cache GOMODCACHE=/Users/aman/go/pkg/mod go test ./internal/web; go build ./... (same env, passed with read-only module stat-cache warning); npm run test; npx tsc --noEmit. Full go test ./... is blocked in this sandbox by existing network/listener-dependent internal/api and internal/news tests.
Reframe Briefing into GP-window sections with driver/team tag chips, a sticky
"since last race" header, and client-side digest helpers (gpWindows, groupByWindow,
tagItems). Overlapping inter-race windows resolve to the latest GP; undated items
land in a Recent bucket. Vitest covers digest lib + page render/filter behaviour.
Co-authored-by: Cursor <cursoragent@cursor.com>
Add deterministic server-side chapter detection for starts, flag periods, pit phases, decisive top-five swings, and finishes, then expose chapters on the race-hub payload.
Spike result: race-hub already loads race control, positions, and laps in one read model. The requested Detect signature does not include pit stops, so pit phases use IsPitOutLap clusters as the local deterministic pit-stop proxy.
