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## Summary Fixes #1136. The live page region filter wiped all packets, polylines, and feed entries the moment any region was selected. Root cause: `public/live.js` parsed `/api/observers` as a top-level array, but the endpoint returns `{observers:[...], server_time:"..."}` — so `observerIataMap` stayed empty and `packetMatchesRegion` rejected every packet. This was a regression introduced in #1080 (live region filter) after the typed-struct refactor wrapped the observer list in `ObserverListResponse` (cmd/server/types.go). ## Fix - Extracted the parse into `buildObserverIataMap(data)` — a pure helper that accepts both the real `{observers:[...]}` shape and a bare array (defensive). Skips observers with no IATA so the result is a direct lookup map. - `initLiveRegionFilter` now uses the helper, so the map is populated on first paint. - Exposed `_liveBuildObserverIataMap` and `_liveGetObserverIataMap` on `window` for tests (read-only — no behavior change). Backend untouched — the API shape is correct. ## Tests (red → green) **Red commit** (`test(live): failing tests for #1136 region filter wipes feed`): - `test-issue-1136-observer-iata-map.js` — failed at "helper must be exposed" assertion (parser was inlined, not extracted). - `test-issue-1136-live-region-e2e.js` — Playwright. Loads `/#/live`, queries `/api/observers` to discover an SJC observer, asserts the live module's `observerIataMap` is populated, selects SJC via `RegionFilter.setSelected`, pushes a fixture packet through `_liveBufferPacket`, and asserts a `.live-feed-item[data-hash=...]` renders. Failed at both the "map populated" and "feed renders" assertions — exactly the user-reported symptom. - Both wired into `.github/workflows/deploy.yml` (unit step + Playwright step). **Green commit** (`fix(live): parse {observers:[...]} ...`): all five unit assertions + all five E2E assertions pass. Existing `test-live-region-filter.js` from #1080 still passes (no behavior change to `packetMatchesRegion`). ## Verification (local) ``` node test-issue-1136-observer-iata-map.js # 5/5 pass node test-live-region-filter.js # 9/9 pass (regression guard) BASE_URL=http://localhost:13581 \ CHROMIUM_PATH=/usr/bin/chromium \ node test-issue-1136-live-region-e2e.js # 5/5 pass against fixture DB ``` ## Scope - One frontend file changed (`public/live.js`). - Two new tests + 2 lines of CI wiring. - No backend changes. - No refactor of unrelated `live.js` code. - Out of scope: #1108 (the related "hide nodes not seen by region" feature request) is intentionally not addressed here. Fixes #1136 --------- Co-authored-by: corescope-bot <bot@corescope.local>