feat: add reward & fee cut history charts to orchestrator page

[rickstaa]

Summary

Adds historical charts for an orchestrator's reward cut and fee cut to the orchestrator page. Delegators can now see how a given orchestrator has changed their cuts over time before delegating.

• New OrchestratorCutHistory component renders two step-line charts (reward cut and fee cut) via ExplorerChart
• New useOrchestratorCutHistory hook fetches historical TranscoderUpdateEvents from the subgraph and prepares chart-ready data, with two anchor points for edge cases:
  • a "now" anchor so the line extends to the present day when the last on-chain update is older than 24h
  • an "activation" anchor synthesized from the current on-chain cut values at activationTimestamp when the orchestrator has no TranscoderUpdateEvents at all (activated with cuts they've never changed), so the chart renders a flat line from activation → now instead of hanging on an empty skeleton
• Chart is hidden entirely when there's nothing to plot (e.g. never-activated accounts) rather than showing an empty panel
• ExplorerChart gains a lineCurve prop (monotone / stepAfter / linear) so cut charts render with the correct step-style line
• ExplorerChart tooltip prop widened to ReactNode. The hardcoded "estimation methodology was updated on 8/21/23" note — previously leaked onto every chart as a default prop via fix: update usage to use new API endpoint #227 — is removed and passed inline only from the Estimated Usage chart, which is the only chart the forum post actually describes (the post explicitly points to Fees Paid as the unaffected alternative)
• Charts sit below the Treasury Governance Participation card; the stats masonry layout is preserved

Note: this is the first of two PRs. A follow-up PR will add a bait-and-switch warning system (detection + UI) on top of the hook introduced here.

Test plan

• Visit /accounts/<orchestrator-id>/orchestrating for an orchestrator with TranscoderUpdateEvent history and confirm both charts render the step curve at the actual on-chain change points
• Visit /accounts/<orchestrator-id>/orchestrating for an orchestrator without any TranscoderUpdateEvents (never changed their cuts — e.g. 0x41239fb65360981316fcb4a8548320d305f9496d) and confirm a flat line renders from activationTimestamp to the current day
• Confirm the "now" anchor extends the line to the current day when the last update is older than 24h
• Confirm the charts are hidden entirely (not stuck on skeleton) for an account that is not an active orchestrator
• Confirm axis labels are not clipped on mobile (Y-axis '100%' label)
• Confirm loading skeletons show while data is fetching
• Confirm layout is unchanged elsewhere on the page
• Confirm the estimation methodology note appears only on the Estimated Usage chart on the homepage, not on Fees Paid / Participation Rate / Inflation Rate / Delegators / Orchestrators
• Confirm the reward/fee cut tooltips do not show the estimation methodology note

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[Copilot]

Pull request overview

Adds orchestrator reward cut / fee cut history visualization to the orchestrator “Orchestrating” page by fetching TranscoderUpdateEvents from the subgraph and rendering step-line charts via ExplorerChart.

Changes:

• Add a new subgraph query (transcoderUpdateEvents) and Apollo hook generation to fetch historical cut updates.
• Introduce useRewardCutHistory to transform update events into chart-ready series (including an optional “now” anchor).
• Extend ExplorerChart to support an optional tooltipNote and configurable line curve (for step-style charts), and render the new RewardCutHistory section on the orchestrator page.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
queries/transcoderUpdateEvents.graphql	Adds a query to fetch historical transcoder update events (rewardCut/feeShare/timestamp).
apollo/subgraph.ts	Generated Apollo types/hooks for the new query.
hooks/useRewardCutHistory.tsx	New hook to fetch and map update events into percent-decimal chart series.
components/RewardCutHistory/index.tsx	New UI component rendering Reward Cut + Fee Cut step-line charts.
components/OrchestratingView/index.tsx	Places the new history charts under the governance participation card; preserves masonry above.
components/ExplorerChart/index.tsx	Adds tooltipNote override + lineCurve prop and tweaks Y-axis width for percent labels.

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Project	Deployment	Actions	Updated (UTC)
explorer-arbitrum-one	Ready	Preview, Comment	Apr 14, 2026 10:35am