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RED commit: `22ce5736066142583017cad7303fa48d9e00ccf0` — CI on red: https://github.com/Kpa-clawbot/CoreScope/actions?query=branch%3Afix%2Fissue-1262 ## Problem After #1260 added a 15s-TTL bulk cache for repeater enrichment in `handleNodes`, `/api/nodes` (default limit) dropped to ~500ms. But `/api/nodes?limit=2000` — called by `public/live.js` at SPA startup for hop resolution — still took **15.7s cold** on staging (75k tx, 600 nodes). Warm hits were ~40ms. Root cause: the bulk cache was lazily populated on the first request after TTL expiry. The rebuild ran on the request-serving goroutine. Every cold SPA load triggered the rebuild and ate 15s. ## Fix Add `StartRepeaterEnrichmentRecomputer` — a steady-state background recomputer that mirrors the `analytics_recomputer.go` pattern from #1240: - **Prewarm**: initial synchronous compute on Start so the first request hits a populated cache. - **Steady-state**: ticker refreshes the snapshot every 5min (configurable via the existing analytics recompute interval knob). - **Panic-safe** + idempotent Start. Wired into `main.go` right after `StartAnalyticsRecomputers`, using `cfg.GetHealthThresholds().RelayActiveHours` as the window. ## Test `TestHandleNodesLimit2000ColdMiss` — seeds 600 nodes + 150k non-advert tx with repeaters indexed under a shared 1-byte hop prefix (matches production hop-prefix collisions), starts the recomputer, then issues `/api/nodes?limit=2000` with **no HTTP warmup**. | State | Latency | |---|---| | Before (master, on-thread rebuild) | 3.37s | | After (prewarm + steady-state) | 56ms | | Budget | 2s | Staging end-to-end: 15.7s → expected sub-100ms on the same call path. Red commit (`22ce5736066142583017cad7303fa48d9e00ccf0`) compiles with a no-op stub of the new method so the test fails on the latency **assertion**, not a missing symbol. Fixes #1262 --------- Co-authored-by: corescope-bot <bot@corescope.local>