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+# Phase 2D — SignalR Wiring
+
+> **Parent:** `2026-04-14-phase-2-online-board-master.md` § 2D
+>
+> **Goal:** Wire the generic `useLiveFlights` hook (1E) to TrackerHub channels for the Online Board's search and details pages. Two thin composition hooks, each tested.
+
+---
+
+## Prerequisites
+
+| Artifact | Source |
+|---|---|
+| `useLiveFlights<TParams, TData>` | `src/shared/hooks/useLiveFlights.ts` (1E) |
+| `SignalRConnection`, `ConnectionStatus` | `src/shared/signalr/connection.ts` (1E) |
+| `useOnlineBoard` (refresh callback) | `src/features/online-board/hooks/useOnlineBoard.ts` (2C) |
+| `useFlightDetails` | `src/features/online-board/hooks/useFlightDetails.ts` (2C) |
+| `ISimpleFlight`, `IFlightId` | `src/features/online-board/types.ts` (2A) |
+| `getEnv().SIGNALR_HUB_URL` | `src/env/index.ts` (1A) |
+
+---
+
+## Tasks
+
+### T1 — Create `useLiveBoardSearch` hook
+
+**File:** `src/features/online-board/hooks/useLiveBoardSearch.ts`
+
+- Accepts `{ date: string; departure?: string; arrival?: string }` params and `initialFlights: ISimpleFlight[]`.
+- Composes `useLiveFlights` with config:
+  - `hubUrl` from `getEnv().SIGNALR_HUB_URL`
+  - `channelKey` builds `board:${date}:${departure ?? ""}:${arrival ?? ""}`
+- Returns `{ flights: ISimpleFlight[]; connectionStatus: ConnectionStatus }`.
+- Client-only: `useLiveFlights` already handles SSR guard.
+
+### T2 — Create `useLiveFlightDetails` hook
+
+**File:** `src/features/online-board/hooks/useLiveFlightDetails.ts`
+
+- Accepts `{ carrier: string; flightNumber: string; suffix?: string; date: string }` (matches `IParsedFlightId`) and `initialFlight: ISimpleFlight | null`.
+- Composes `useLiveFlights` with config:
+  - `hubUrl` from `getEnv().SIGNALR_HUB_URL`
+  - `channelKey` builds `flight:${carrier}${flightNumber}${suffix ?? ""}@${date}`
+- Returns `{ flight: ISimpleFlight | null; connectionStatus: ConnectionStatus }`.
+
+### T3 — Write tests for `useLiveBoardSearch`
+
+**File:** `src/features/online-board/hooks/useLiveBoardSearch.test.ts`
+
+- **Channel key construction:** date-only, date+departure, date+departure+arrival all produce correct keys.
+- **Data passthrough:** initial data flows through from `useLiveFlights`.
+- **Live update:** simulated SignalR message replaces flight data.
+- **SSR:** returns initial data with idle status when `window` is undefined.
+
+### T4 — Write tests for `useLiveFlightDetails`
+
+**File:** `src/features/online-board/hooks/useLiveFlightDetails.test.ts`
+
+- **Channel key construction:** with and without suffix.
+- **Data passthrough:** initial flight (or null) flows through.
+- **Live update:** simulated message replaces single flight.
+- **SSR:** idle status, no SignalR import.
+
+### T5 — Export from barrel
+
+**File:** `src/features/online-board/index.ts`
+
+- Add exports for both hooks and their result types.
+
+### T6 — Verification
+
+- `pnpm typecheck && pnpm lint && pnpm test`
+
+---
+
+## Exit gates
+
+| Gate | Verification |
+|---|---|
+| Channel keys correct | Unit tests for key construction |
+| Live updates flow | Mock SignalR push updates state |
+| SSR safe | Returns initial data without touching SignalR |
+| No regressions | All existing tests still pass |
+| Types clean | `pnpm typecheck` passes |
+| Lint clean | `pnpm lint` passes |