feat: Phase 2 NASDAQ adapter for days-to-cover + 24mo history

- Add nasdaq SourceKind + nasdaqShortinterest KindHandler (kv_cache with nasdaq: prefix)
- Create NasdaqAdapter: calls api.nasdaq.com/quote/SYM/short-interest, parses settlementDate/sharesShort/daysToCover/avgVolume, returns 24mo history; handles non-NASDAq gracefully
- Register NasdaqAdapter in server index.ts adapters map
- Update shortInterest procedure: reads both yfinance + nasdaq caches in parallel, reconciles (NASDAQ for daysToCover/sharesShort, Yahoo for %float/shortRatio and NYSE fallback)
- Update ShortInterestPanel: display daysToCover, settlement date, source badges, 6-month history table, updated disclaimer
- Update trpc.ts client type for merged response shape

app/src/components/ShortInterestPanel.tsx

@@ -2,6 +2,13 @@
 import { useState, useEffect, useMemo } from 'react';
 import { api } from '@/lib/trpc';
 
+interface HistoryEntry {
+  settlementDate: string;
+  sharesShort: number | null;
+  avgDailyVolume: number | null;
+  daysToCover: number;
+}
+
 interface ShortInterestData {
   symbol: string;
   sharesShort: number | null;
@@ -12,8 +19,11 @@ interface ShortInterestData {
   dateShortInterest: string | null;
   floatShares: number | null;
   sharesOutstanding: number | null;
+  daysToCover: number | null;
+  settlementDate: string | null;
+  history: HistoryEntry[] | null;
+  sources: { yfinance: { available: boolean; stale: boolean }; nasdaq: { available: boolean; stale: boolean } };
   stale: boolean;
-  provenance: { fetchedAt: string; sourceKind: string; rawSourceId?: string } | null;
 }
 
 function formatNumber(n: number | null): string {
@@ -62,34 +72,65 @@ export function ShortInterestPanel({ symbol }: { symbol: string | null }) {
   );
   if (!data) return <div className="text-xs text-fg-muted py-2">No short interest data available for {symbol}.</div>;
 
-  const dateLabel = data.dateShortInterest
-    ? `as of ${data.dateShortInterest}`
-    : data.provenance?.fetchedAt
-      ? `fetched ${data.provenance.fetchedAt.slice(0, 10)}`
+  const dateLabel = data.settlementDate
+    ? `Settlement: ${data.settlementDate}`
+    : data.dateShortInterest
+      ? `Yahoo: ${data.dateShortInterest}`
       : null;
 
+  const sourceTags = [] as string[];
+  if (data.sources.nasdaq.available) sourceTags.push('NASDAQ');
+  if (data.sources.yfinance.available) sourceTags.push('Yahoo');
+  const sourceLabel = sourceTags.length ? sourceTags.join(' + ') : '—';
+
+  const historySlice = data.history ? data.history.slice(0, 6) : [];
+
   return (
     <div className="rounded-lg bg-surface-sunken border border-line p-4 space-y-3">
       <h4 className="text-sm font-semibold text-fg">Short Interest</h4>
       {dateLabel && (
-        <p className="text-[10px] text-fg-muted">{dateLabel}{data.stale ? ' — stale' : ''}</p>
+        <p className="text-[10px] text-fg-muted">{dateLabel}{data.stale ? ' — stale' : ''} ({sourceLabel})</p>
       )}
       {data.sharesShort !== null && (
         <dl className="grid grid-cols-2 gap-x-6 gap-y-1 text-sm">
           <div className="flex justify-between"><dt className="text-fg-muted">Shares Short</dt><dd className="text-fg font-mono">{formatNumber(data.sharesShort)}</dd></div>
           <div className="flex justify-between"><dt className="text-fg-muted">% of Float</dt><dd className="text-fg font-mono">{formatPct(data.sharesPercentSharesOut)}</dd></div>
           <div className="flex justify-between"><dt className="text-fg-muted">Short Ratio</dt><dd className="text-fg font-mono">{data.shortRatio !== null ? `${data.shortRatio.toFixed(1)}d` : '—'}</dd></div>
-          <div className="flex justify-between"><dt className="text-fg-muted">% of Float (prior mo)</dt><dd className="text-fg font-mono">{formatPct(data.sharesShortPriorMonth !== null && data.floatShares ? data.sharesShortPriorMonth / data.floatShares : null)}</dd></div>
+          {data.daysToCover !== null && (
+            <div className="flex justify-between"><dt className="text-fg-muted">Days to Cover</dt><dd className="text-fg font-mono">{data.daysToCover.toFixed(2)}d</dd></div>
+          )}
+          {data.sharesShortPriorMonth !== null && data.floatShares ? (
+            <div className="flex justify-between"><dt className="text-fg-muted">% Float (prior)</dt><dd className="text-fg font-mono">{formatPct(data.sharesShortPriorMonth / data.floatShares)}</dd></div>
+          ) : null}
           {data.floatShares !== null && (
             <div className="flex justify-between"><dt className="text-fg-muted">Float Shares</dt><dd className="text-fg font-mono">{formatNumber(data.floatShares)}</dd></div>
           )}
           {data.sharesOutstanding !== null && (
-            <div className="flex justify-between"><dt className="text-fg-muted">Shares Outstanding</dt><dd className="text-fg font-mono">{formatNumber(data.sharesOutstanding)}</dd></div>
+            <div className="flex justify-between"><dt className="text-fg-muted">Shares Out</dt><dd className="text-fg font-mono">{formatNumber(data.sharesOutstanding)}</dd></div>
           )}
         </dl>
       )}
-      <p className="text-[10px] text-fg-muted">
-        Short interest from Yahoo Finance (derived from exchange filings). Educational display only — not investment advice.
+      {historySlice.length > 0 && (
+        <div className="mt-2">
+          <p className="text-[10px] text-fg-muted mb-1">6-month history (NASDAQ source)</p>
+          <div className="overflow-x-auto">
+            <table className="w-full text-[10px] text-fg-muted">
+              <thead><tr><th className="text-left py-0.5">Date</th><th className="text-right py-0.5">Short</th><th className="text-right py-0.5">Days</th></tr></thead>
+              <tbody>
+                {historySlice.map((h, i) => (
+                  <tr key={i} className="border-b border-line/40">
+                    <td className="py-0.5">{h.settlementDate}</td>
+                    <td className="text-right font-mono">{formatNumber(h.sharesShort)}</td>
+                    <td className="text-right font-mono">{h.daysToCover.toFixed(2)}</td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          </div>
+        </div>
+      )}
+      <p className="text-[10px] text-fg-muted mt-1">
+        Reconciled from NASDAQ (days-to-cover, history) + Yahoo Finance (all tickers). Educational display only.
       </p>
     </div>
   );