diff --git a/frontend/src/hooks/useApi.ts b/frontend/src/hooks/useApi.ts
index 303a4ae..633f0ed 100644
--- a/frontend/src/hooks/useApi.ts
+++ b/frontend/src/hooks/useApi.ts
@@ -146,7 +146,15 @@ export const useAddWatchlistInstrument = () => {
 export const useInstrumentCatalogIds = () =>
   useQuery({
     queryKey: ['instrument-analysis-catalog'],
-    queryFn: () => api.get('/instruments/').then(r => new Set((r.data ?? []).map((i: any) => String(i.id).toUpperCase()))),
+    // No trailing slash: the backend route is registered at "/api/instruments" exactly
+    // (router.get("")) — a trailing slash still resolves via FastAPI's redirect_slashes,
+    // but calling the exact path avoids depending on that 307 round-trip surviving the
+    // nginx proxy_pass unchanged.
+    queryFn: () => api.get('/instruments').then(r => {
+      const ids = new Set<string>((r.data ?? []).map((i: any) => String(i.id).toUpperCase()))
+      console.debug('[useInstrumentCatalogIds] loaded', ids.size, 'catalog ids:', Array.from(ids))
+      return ids
+    }),
     staleTime: 10 * 60_000,
   })
 
diff --git a/frontend/src/pages/Dashboard.tsx b/frontend/src/pages/Dashboard.tsx
index e1a3054..861dc0e 100644
--- a/frontend/src/pages/Dashboard.tsx
+++ b/frontend/src/pages/Dashboard.tsx
@@ -1,4 +1,4 @@
-import { useMemo, useState, useRef, useLayoutEffect } from 'react'
+import { useMemo, useState, useRef, useLayoutEffect, useEffect } from 'react'
 import { useQuery } from '@tanstack/react-query'
 import {
   useGeoRiskScore, useAllQuotes,
@@ -132,7 +132,7 @@ export default function Dashboard() {
   const { data: geoNews } = useGeoNews()
   const { data: watchlistItems } = useInstrumentsWatchlist()
   const { data: watchlistQuotesData } = useInstrumentsWatchlistQuotes()
-  const { data: instrumentCatalogIds } = useInstrumentCatalogIds()
+  const { data: instrumentCatalogIds, isError: instrumentCatalogError, error: instrumentCatalogErrorObj } = useInstrumentCatalogIds()
   const [ecoImpactFilter, setEcoImpactFilter] = useState<Set<string>>(new Set(['high', 'medium', 'low']))
   const [ecoCurrencyFilter, setEcoCurrencyFilter] = useState<Set<string>>(new Set(ECO_CURRENCY_FILTERS))
   const [ecoShowNextWeek, setEcoShowNextWeek] = useState(false)
@@ -145,6 +145,24 @@ export default function Dashboard() {
   const { data: waveletSignalsData } = useWaveletWatchlistSignals()
   const { data: saxoIvWatchlistData } = useSaxoIvWatchlist()
 
+  // Diagnostic for the Watchlist card's "open in Instrument Analysis" arrow/double-click:
+  // logs whether the catalog query succeeded and how each watchlist ticker resolves
+  // against it, so a missing arrow can be traced to "catalog query failed" vs. "ticker
+  // genuinely isn't registered in instruments.json" without needing a debugger.
+  useEffect(() => {
+    if (instrumentCatalogError) {
+      console.error('[Watchlist] instrument catalog query failed:', instrumentCatalogErrorObj)
+      return
+    }
+    if (!instrumentCatalogIds || !watchlistQuotesData) return
+    const items: any[] = (watchlistQuotesData as any)?.items ?? []
+    console.debug('[Watchlist] catalog ids:', Array.from(instrumentCatalogIds as Set<string>))
+    console.debug('[Watchlist] ticker -> catalogId resolution:', items.map((it: any) => ({
+      ticker: it.ticker,
+      resolved: resolveCatalogId(it.ticker, instrumentCatalogIds as Set<string>) ?? null,
+    })))
+  }, [instrumentCatalogIds, instrumentCatalogError, instrumentCatalogErrorObj, watchlistQuotesData])
+
   // Historical PnL curve (realized, from closed portfolio positions) + latest VaR snapshot
   const { data: pnlHistoryData } = usePnlHistory()
   const { data: latestVarData } = useQuery({