Add auto-trade scheduler with batch locking, commission gross-up, and sync gate

- Auto-trade scheduler fires every 60s; uses Promise.allSettled batch so no new trades fire while any position from the current batch is open
- Commission gross-up: read entryCommission from cash.realizedPnL after fill (fallback 2.5×contracts), grossTarget = target + 2×entryCommission
- Sync gate: TradovateClient.syncComplete flag; scheduler skips tick until every client finishes initial position/balance sync
- Contracts formula changed to Math.ceil so $1500 target = 2 contracts
- Removed all fee caching (perContractFees, recentFills, fillFee handler) from tradovate-class.ts
- Removed firm_fees table, getFirmFees, upsertFirmFee from db.ts
- Deleted instrument-configs API routes; removed Fees UI from firm settings page
- /api/instruments returns full {symbol, enabled}[] objects; dashboard filters to enabled-only for trade selector
- Added auto-trade, debug, orders, settings, and trade API routes
- Instrument selector on dashboard now driven by enabled instruments from DB

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/settings/page.tsx

@@ -8,13 +8,28 @@ interface Instrument {
     enabled: boolean;
 }
 
+interface AppSettings {
+    max_concurrent_accounts: string | null;
+}
+
 export default function SettingsPage() {
     const [instruments, setInstruments] = useState<Instrument[]>([]);
+    const [maxConcurrent, setMaxConcurrent] = useState<string>('5');
+    const [saving, setSaving] = useState(false);
+    const [saved, setSaved] = useState(false);
 
     useEffect(() => {
         fetch('/api/instruments')
             .then((r) => r.json())
             .then(setInstruments);
+
+        fetch('/api/settings')
+            .then((r) => r.json())
+            .then((s: AppSettings) => {
+                if (s.max_concurrent_accounts != null) {
+                    setMaxConcurrent(s.max_concurrent_accounts);
+                }
+            });
     }, []);
 
     async function toggle(symbol: string, enabled: boolean) {
@@ -28,6 +43,19 @@ export default function SettingsPage() {
         });
     }
 
+    async function saveSettings() {
+        setSaving(true);
+        setSaved(false);
+        await fetch('/api/settings', {
+            method: 'PATCH',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ max_concurrent_accounts: maxConcurrent }),
+        });
+        setSaving(false);
+        setSaved(true);
+        setTimeout(() => setSaved(false), 2000);
+    }
+
     return (
         <div className="min-h-screen bg-slate-50 p-8">
             <div className="max-w-7xl mx-auto">
@@ -42,6 +70,43 @@ export default function SettingsPage() {
                     <h1 className="text-2xl font-bold text-slate-900">Settings</h1>
                 </div>
 
+                {/* ── Trading ── */}
+                <h2 className="text-sm font-semibold uppercase tracking-wider text-slate-500 mb-3">
+                    Trading
+                </h2>
+                <div className="bg-white border border-slate-200 rounded-xl shadow-sm mb-8">
+                    <div className="flex items-center justify-between px-4 py-3">
+                        <div>
+                            <p className="text-sm font-medium text-slate-800">Max concurrent accounts</p>
+                            <p className="text-xs text-slate-400 mt-0.5">
+                                How many accounts trade in parallel per /api/trade call
+                            </p>
+                        </div>
+                        <div className="flex items-center gap-3">
+                            <input
+                                type="number"
+                                min={1}
+                                max={500}
+                                value={maxConcurrent}
+                                onChange={(e) => setMaxConcurrent(e.target.value)}
+                                className="w-20 rounded-lg border border-slate-200 bg-slate-50 px-3 py-1.5 text-sm text-right font-mono text-slate-800 focus:outline-none focus:ring-2 focus:ring-blue-500"
+                            />
+                            <button
+                                onClick={saveSettings}
+                                disabled={saving}
+                                className={`text-sm px-3 py-1.5 rounded-lg font-medium transition-colors ${
+                                    saved
+                                        ? 'bg-green-500 text-white'
+                                        : 'bg-blue-500 hover:bg-blue-600 text-white disabled:opacity-50'
+                                }`}
+                            >
+                                {saved ? 'Saved ✓' : saving ? 'Saving…' : 'Save'}
+                            </button>
+                        </div>
+                    </div>
+                </div>
+
+                {/* ── Instruments ── */}
                 <h2 className="text-sm font-semibold uppercase tracking-wider text-slate-500 mb-3">
                     Instruments
                 </h2>