Reconstruct TopstepX MLL floors from the EOD balance curve

TopstepX never reports the Maximum Loss Limit, but it's deterministic:
floor = min(0, eodBalanceHigh − trailingDrawdown), locking at the $0
starting balance. The EOD curve rebuilds from daily P&L + fund events,
with off-book fee drift spread across days proportionally to reported
fees (validated against a platform-reported MLL to ~$0.10). Stored in
autoLiqThresholds — negative, or +$0.01 once locked — so dead detection,
dashboards, and the ruin model's startThreshold all use the real room.
Guards move from '> 0' to '!== 0'; 0 still means no floor. canTrade=false
accounts are skipped. daily_pnl gains a fees column for the weighting.

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

lib/db.ts

@@ -236,18 +236,27 @@ db.exec(`
     );
 `);
 
-export function saveDailyPnL(accountId: number, accountName: string, entries: { date: string; pnl: number }[]): void {
-    const ins = db.prepare('INSERT OR REPLACE INTO daily_pnl (account_id, account_name, date, pnl) VALUES (?, ?, ?, ?)');
+// Migration: the day's reported fees (TopstepX). The MLL reconstruction
+// distributes off-book fee drift across days proportionally to these; rows
+// from before the migration read 0 until the next fetch overwrites them.
+try {
+    db.exec('ALTER TABLE daily_pnl ADD COLUMN fees REAL NOT NULL DEFAULT 0');
+} catch {
+    // Column already exists
+}
+
+export function saveDailyPnL(accountId: number, accountName: string, entries: { date: string; pnl: number; fees?: number }[]): void {
+    const ins = db.prepare('INSERT OR REPLACE INTO daily_pnl (account_id, account_name, date, pnl, fees) VALUES (?, ?, ?, ?, ?)');
     const txn = db.transaction(() => {
         for (const e of entries) {
-            ins.run(accountId, accountName, e.date, e.pnl);
+            ins.run(accountId, accountName, e.date, e.pnl, e.fees ?? 0);
         }
     });
     txn();
 }
 
-export function loadDailyPnL(accountId: number): { date: string; pnl: number }[] {
-    return (db.prepare('SELECT date, pnl FROM daily_pnl WHERE account_id = ? ORDER BY date').all(accountId) as { date: string; pnl: number }[]);
+export function loadDailyPnL(accountId: number): { date: string; pnl: number; fees: number }[] {
+    return (db.prepare('SELECT date, pnl, fees FROM daily_pnl WHERE account_id = ? ORDER BY date').all(accountId) as { date: string; pnl: number; fees: number }[]);
 }
 
 // ── Fund Transactions Cache ───────────────────────────────────────────────────