Add a wipe & recalculate button to the account detail page

Cached daily P&L rows outlive what the Cash History report still
produces (stale pre-roll dates being the recent example), and nothing
deletes them any more. POST /api/accounts/[id]/wipe drops the account's
cached P&L, fund transactions and meta, clears the in-memory view, and
rebuilds from a fresh report — fetchDaysTraded now takes an optional
account filter so one account doesn't cost a report round-trip on every
other. The button confirms inline first: rows older than the report's
28-day window cannot be refetched.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/accounts/[id]/page.tsx

@@ -80,6 +80,69 @@ function fmt(value: number) {
     return value.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 });
 }
 
+/** Wipes the account's cached P&L / fund / meta rows and refetches from
+ *  Tradovate. Confirmed inline because rows older than the report's 28-day
+ *  window cannot come back. */
+function WipeDataButton({ accountId, onDone }: { accountId: number; onDone: () => void }) {
+    const [confirming, setConfirming] = useState(false);
+    const [busy, setBusy] = useState(false);
+    const [error, setError] = useState('');
+
+    async function wipe() {
+        setBusy(true);
+        setError('');
+        try {
+            const res = await fetch(`/api/accounts/${accountId}/wipe`, { method: 'POST' });
+            const body = await res.json().catch(() => ({}));
+            if (!res.ok) throw new Error(body.error ?? 'Wipe failed');
+            if (body.fetchError) setError(`Wiped, but refetch: ${body.fetchError}`);
+            setConfirming(false);
+            onDone();
+        } catch (err) {
+            setError(err instanceof Error ? err.message : 'Wipe failed');
+        } finally {
+            setBusy(false);
+        }
+    }
+
+    if (confirming) {
+        return (
+            <div className="ml-auto flex items-center gap-2">
+                <span className="text-xs text-slate-500">
+                    Wipe cached data and refetch? Days older than the 28-day report window are lost for good.
+                </span>
+                <button
+                    onClick={wipe}
+                    disabled={busy}
+                    className="px-2.5 py-1 bg-red-100 hover:bg-red-200 disabled:opacity-50 text-red-700 text-xs font-semibold rounded-md transition-colors"
+                >
+                    {busy ? 'Refetching…' : 'Wipe & recalculate'}
+                </button>
+                <button
+                    onClick={() => { setConfirming(false); setError(''); }}
+                    disabled={busy}
+                    className="px-2.5 py-1 bg-slate-100 hover:bg-slate-200 disabled:opacity-50 text-slate-600 text-xs font-semibold rounded-md transition-colors"
+                >
+                    Cancel
+                </button>
+            </div>
+        );
+    }
+
+    return (
+        <div className="ml-auto flex items-center gap-2">
+            {error && <span className="text-xs text-red-500">{error}</span>}
+            <button
+                onClick={() => setConfirming(true)}
+                className="px-2.5 py-1 text-xs font-semibold text-slate-400 hover:text-red-600 hover:bg-red-50 rounded-md transition-colors"
+                title="Delete this account's cached daily P&L, fund transactions and meta, then rebuild them from a fresh Tradovate report"
+            >
+                Wipe & recalculate
+            </button>
+        </div>
+    );
+}
+
 function fmtDate(iso: string) {
     const [, m, d] = iso.split('-');
     return `${parseInt(m)}/${parseInt(d)}`;
@@ -410,6 +473,7 @@ export default function AccountPage() {
                             ☠ DEAD
                         </span>
                     )}
+                    <WipeDataButton accountId={account.id} onDone={() => { void load(); }} />
                 </div>
 
                 {isDead && (