diff --git a/apps/cli/src/tui/statusFreshness.test.ts b/apps/cli/src/tui/statusFreshness.test.ts
index 4187d1d..d450307 100644
--- a/apps/cli/src/tui/statusFreshness.test.ts
+++ b/apps/cli/src/tui/statusFreshness.test.ts
@@ -207,22 +207,24 @@ describe('computeStatusFreshness — stale payload', () => {
 
   it('badges stale once age exceeds the threshold', () => {
     const now = 1_700_000_000_000;
+    const ageMs = TRADE_STALE_AFTER_MS + 42_000; // well past the threshold
     const out = computeStatusFreshness({
       ...BASE,
       dataLoading: false,
-      lastTickMs: now - (TRADE_STALE_AFTER_MS + 42_000), // 52s past last tick
+      lastTickMs: now - ageMs,
       nowMs: now,
     });
+    const sec = Math.round(ageMs / 1000);
     expect(out.isStale).toBe(true);
-    expect(out.staleSec).toBe(52);
-    expect(out.freshnessStr).toContain('stale 52s');
+    expect(out.staleSec).toBe(sec);
+    expect(out.freshnessStr).toContain(`stale ${sec}s`);
   });
 
   it('renders real (stale) PnL so the operator can still see last-known numbers', () => {
     const now = 1_700_000_000_000;
     const out = computeStatusFreshness({
       dataLoading: false,
-      lastTickMs: now - 30_000,
+      lastTickMs: now - (TRADE_STALE_AFTER_MS + 5_000), // clearly past the stale threshold
       nowMs: now,
       realizedPnl: 7.0,
       realizedPnlPct: 1.1,
diff --git a/apps/web/src/app/api/auth/signup/route.ts b/apps/web/src/app/api/auth/signup/route.ts
index 3aafc39..88dc75a 100644
--- a/apps/web/src/app/api/auth/signup/route.ts
+++ b/apps/web/src/app/api/auth/signup/route.ts
@@ -27,6 +27,8 @@ export async function POST(req: NextRequest) {
     );
   }
 
+  if (!data.user) return Response.json({ error: 'no user returned' }, { status: 500 });
+
   const payload = {
     user: { id: data.user.id, email: data.user.email },
     session: data.session && {
diff --git a/apps/web/src/app/console/page.tsx b/apps/web/src/app/console/page.tsx
index 55e4656..ac6c207 100644
--- a/apps/web/src/app/console/page.tsx
+++ b/apps/web/src/app/console/page.tsx
@@ -4,6 +4,7 @@ import Image from 'next/image';
 import { createServerSupabase } from '@/lib/supabase';
 import { ConsoleClient } from './console-client';
 import { RenewalBanner } from '@/components/renewal-banner';
+import { SignOutForm } from '@/components/sign-out-form';
 
 export const dynamic = 'force-dynamic';
 
@@ -26,9 +27,7 @@ export default async function ConsolePage() {
           <Link href="/store" className="text-zinc-400 hover:text-zinc-200">Store</Link>
           <Link href="/settings" className="text-zinc-400 hover:text-zinc-200">Settings</Link>
           <span className="text-zinc-400">{user.email}</span>
-          <form action="/api/auth/logout" method="POST">
-            <button className="text-zinc-500 hover:text-zinc-300">Sign out</button>
-          </form>
+          <SignOutForm className="text-zinc-500 hover:text-zinc-300" />
         </div>
       </nav>
       <RenewalBanner userId={user.id} />
diff --git a/apps/web/src/app/dashboard/page.tsx b/apps/web/src/app/dashboard/page.tsx
index 5d88a0a..96bf289 100644
--- a/apps/web/src/app/dashboard/page.tsx
+++ b/apps/web/src/app/dashboard/page.tsx
@@ -6,6 +6,7 @@ import { TradingChart } from './trading-chart';
 import { DashboardSummary } from './dashboard-summary';
 import { GrowthProjection } from './growth-projection';
 import { RenewalBanner } from '@/components/renewal-banner';
+import { SignOutForm } from '@/components/sign-out-form';
 
 export const dynamic = 'force-dynamic';
 
@@ -29,9 +30,7 @@ export default async function DashboardPage() {
           <Link href="/console" className="text-sm text-orange-300 hover:text-orange-200">Console →</Link>
           <Link href="/settings" className="text-sm text-zinc-400 hover:text-zinc-200">Settings</Link>
           <span className="text-sm text-zinc-400">{user.email}</span>
-          <form action="/api/auth/logout" method="POST">
-            <button className="text-sm text-zinc-500 hover:text-zinc-300 transition">Sign out</button>
-          </form>
+          <SignOutForm className="text-sm text-zinc-500 hover:text-zinc-300 transition" />
         </div>
       </nav>
 
diff --git a/apps/web/src/app/dashboard/projections/page.tsx b/apps/web/src/app/dashboard/projections/page.tsx
index f7d07fb..eda51b5 100644
--- a/apps/web/src/app/dashboard/projections/page.tsx
+++ b/apps/web/src/app/dashboard/projections/page.tsx
@@ -3,6 +3,7 @@ import { redirect } from 'next/navigation';
 import Link from 'next/link';
 import Image from 'next/image';
 import { ProjectionsClient } from './projections-client';
+import { SignOutForm } from '@/components/sign-out-form';
 
 export const dynamic = 'force-dynamic';
 
@@ -25,9 +26,7 @@ export default async function ProjectionsPage() {
           <Link href="/console" className="text-sm text-orange-300 hover:text-orange-200">Console →</Link>
           <Link href="/settings" className="text-sm text-zinc-400 hover:text-zinc-200">Settings</Link>
           <span className="text-sm text-zinc-400">{user.email}</span>
-          <form action="/api/auth/logout" method="POST">
-            <button className="text-sm text-zinc-500 hover:text-zinc-300 transition">Sign out</button>
-          </form>
+          <SignOutForm className="text-sm text-zinc-500 hover:text-zinc-300 transition" />
         </div>
       </nav>
 
diff --git a/apps/web/src/app/page.tsx b/apps/web/src/app/page.tsx
index cfb6d3f..3db21d9 100644
--- a/apps/web/src/app/page.tsx
+++ b/apps/web/src/app/page.tsx
@@ -6,6 +6,7 @@ import {
   UniswapLogo, ZeroExLogo, OneInchLogo, JupiterLogo, PumpFunLogo,
   UniswapV4Logo, PancakeSwapLogo, RaydiumLogo, OrcaLogo, AerodromeLogo,
 } from './_components/brand-logos';
+import { SignOutForm } from '@/components/sign-out-form';
 
 export const dynamic = 'force-dynamic';
 
@@ -127,9 +128,7 @@ export default async function LandingPage() {
               <Link href="/console" className="text-sm text-orange-300 hover:text-orange-200 transition">Console</Link>
               <Link href="/settings" className="text-sm text-zinc-400 hover:text-zinc-200 transition">Settings</Link>
               <span className="text-sm text-zinc-500">{user.email}</span>
-              <form action="/api/auth/logout" method="POST">
-                <button className="text-sm text-zinc-500 hover:text-zinc-300 transition">Sign out</button>
-              </form>
+              <SignOutForm className="text-sm text-zinc-500 hover:text-zinc-300 transition" />
             </>
           ) : (
             <>
diff --git a/apps/web/src/app/settings/page.tsx b/apps/web/src/app/settings/page.tsx
index 716a483..ef4fc43 100644
--- a/apps/web/src/app/settings/page.tsx
+++ b/apps/web/src/app/settings/page.tsx
@@ -3,6 +3,7 @@ import Link from 'next/link';
 import Image from 'next/image';
 import { createServerSupabase } from '@/lib/supabase';
 import { SettingsClient } from './settings-client';
+import { SignOutForm } from '@/components/sign-out-form';
 
 export const dynamic = 'force-dynamic';
 
@@ -24,9 +25,7 @@ export default async function SettingsPage() {
         </div>
         <div className="flex items-center gap-4 text-sm">
           <span className="text-zinc-400">{user.email}</span>
-          <form action="/api/auth/logout" method="POST">
-            <button className="text-zinc-500 hover:text-zinc-300">Sign out</button>
-          </form>
+          <SignOutForm className="text-zinc-500 hover:text-zinc-300" />
         </div>
       </nav>
       <SettingsClient />
diff --git a/apps/web/src/app/store/page.tsx b/apps/web/src/app/store/page.tsx
index c7e5cd2..0d269f1 100644
--- a/apps/web/src/app/store/page.tsx
+++ b/apps/web/src/app/store/page.tsx
@@ -5,6 +5,7 @@ import { PLUGIN_CATALOG, type CatalogEntry } from '@b1dz/core';
 import { createServerSupabase } from '@/lib/supabase';
 import { coinpayConfigured } from '@/lib/coinpay-client';
 import { InstallButton } from './install-button';
+import { SignOutForm } from '@/components/sign-out-form';
 
 export const metadata: Metadata = {
   title: 'b1dz Store — Plugin Marketplace',
@@ -78,9 +79,7 @@ export default async function StorePage() {
               <Link href="/dashboard" className="text-sm text-zinc-400 hover:text-zinc-200 transition">Dashboard</Link>
               <Link href="/settings" className="text-sm text-zinc-400 hover:text-zinc-200 transition">Settings</Link>
               <span className="text-sm text-zinc-500">{user.email}</span>
-              <form action="/api/auth/logout" method="POST">
-                <button className="text-sm text-zinc-500 hover:text-zinc-300 transition">Sign out</button>
-              </form>
+              <SignOutForm className="text-sm text-zinc-500 hover:text-zinc-300 transition" />
             </>
           ) : (
             <>
diff --git a/apps/web/src/components/sign-out-form.tsx b/apps/web/src/components/sign-out-form.tsx
new file mode 100644
index 0000000..725ee82
--- /dev/null
+++ b/apps/web/src/components/sign-out-form.tsx
@@ -0,0 +1,23 @@
+'use client';
+
+/**
+ * Sign-out button that clears this browser's b1dz client-side cache before the
+ * server logout. Logout is a server form POST (clears the session cookie), which
+ * can't touch localStorage — so without this, cached dashboard state (e.g.
+ * b1dz:source-state:*) would linger for the next account on a shared browser.
+ * Defense-in-depth on top of the per-user cache keying.
+ */
+export function SignOutForm({ className }: { className?: string }) {
+  const clearClientCache = () => {
+    try {
+      for (const key of Object.keys(window.localStorage)) {
+        if (key.startsWith('b1dz:')) window.localStorage.removeItem(key);
+      }
+    } catch { /* private mode / quota */ }
+  };
+  return (
+    <form action="/api/auth/logout" method="POST" onSubmit={clearClientCache}>
+      <button className={className}>Sign out</button>
+    </form>
+  );
+}
diff --git a/packages/core/src/runtime-cache.test.ts b/packages/core/src/runtime-cache.test.ts
index db71231..c114812 100644
--- a/packages/core/src/runtime-cache.test.ts
+++ b/packages/core/src/runtime-cache.test.ts
@@ -30,9 +30,11 @@ describe('stripLiveSourceState', () => {
           },
         ],
       },
-      // Heavy/noisy tick data should still be stripped from DB fallback.
+      // Heavy/noisy tick data (prices, rawLog) is stripped from the DB fallback.
       prices: [{ exchange: 'kraken', pair: 'BTC-USD', bid: 101, ask: 102 }],
       rawLog: [{ at: 'now', text: 'noise' }],
+      // tradeState is intentionally KEPT: closedTrades is persistent history the
+      // UI needs even when the runtime cache has expired.
       tradeState: { closedTrades: [{ pair: 'BTC-USD' }] },
     };
 
@@ -42,6 +44,6 @@ describe('stripLiveSourceState', () => {
     expect(stripped.tradeStatus).toEqual(payload.tradeStatus);
     expect(stripped.prices).toBeUndefined();
     expect(stripped.rawLog).toBeUndefined();
-    expect(stripped.tradeState).toBeUndefined();
+    expect(stripped.tradeState).toEqual(payload.tradeState);
   });
 });
diff --git a/packages/core/src/runtime-cache.ts b/packages/core/src/runtime-cache.ts
index 0d35113..dbbf9db 100644
--- a/packages/core/src/runtime-cache.ts
+++ b/packages/core/src/runtime-cache.ts
@@ -17,6 +17,7 @@ const LIVE_SOURCE_STATE_FIELDS = new Set([
   'activityLog',
   'openOrders',
   'opportunities',
+  'prices',
   'rawLog',
   'recentTrades',
   'signals',
diff --git a/packages/source-dealdash/src/strategy/decide.test.ts b/packages/source-dealdash/src/strategy/decide.test.ts
index fe9841c..4464e18 100644
--- a/packages/source-dealdash/src/strategy/decide.test.ts
+++ b/packages/source-dealdash/src/strategy/decide.test.ts
@@ -54,9 +54,9 @@ function ctxBase(over: Partial<DecisionContext>): DecisionContext {
 }
 
 const book = (r: { decisions: Decision[] }, id: number) =>
-  r.decisions.find(d => d.kind === 'book' && d.auctionId === id);
+  r.decisions.find((d): d is Extract<Decision, { kind: 'book' }> => d.kind === 'book' && d.auctionId === id);
 const cancel = (r: { decisions: Decision[] }, id: number) =>
-  r.decisions.find(d => d.kind === 'cancel' && d.auctionId === id);
+  r.decisions.find((d): d is Extract<Decision, { kind: 'cancel' }> => d.kind === 'cancel' && d.auctionId === id);
 
 // ---------- balance state transitions ----------