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>
Parse and expose SessionStatus from the official live feed, treating Started/Resumed as active and terminal or missing statuses as inactive archive candidates.
Keep /api/v1/live/state and SSE snapshot data reserved for active sessions while exposing memory-only last_snapshot, last_positions, and last_snapshot_at for the explicit Live tab archive view.
Subscribe to TeamRadio on the F1 live feed, parse defensive capture snapshots and patches, and relay capped captures through live snapshots with the SessionInfo static path. Add the frontend CDN URL helper and ticker using one shared audio element.
Subscribe to SignalR Position.z and CarData.z, decode DEFLATE payloads, stream throttled positions over SSE, and render live car dots against cached track outline bounds with tap telemetry.
Alignment spike: no checked-in or locally cached real Position.z samples were available in this isolated worktree; verified both streams expose the official raw F1 X/Y/Z coordinate contract and implemented shared-bounds normalization against prefetched OpenF1 outlines. Fallback build-outline-from-stream was not taken.
Playwright remains out of scope for live rendering because BOXBOX_DISABLE_LIVE is used there; coverage is via parser, web handler/SSE, pure transform, and seeded component tests.
