Vest: close out trades left open on an account Vest stopped listing

An account that leaves Vest's active list (breached, closed) was never
read again, so a position it had open stayed open in the trades table.
When the list shrinks, and on every full history pass, the client reads
such an account's position history once more per run — its id from
memory or, after a restart, from Vest's closed-account history
(GET /v3/capital/accounts/history) — falling back to the login's token
if the closed account gets none of its own.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/db.ts

@@ -682,6 +682,12 @@ export function markTrade(
     `).run(t.positionId, t.accountId, t.accountName, t.symbol, t.side, t.quantity, t.openPrice, t.openedAt, Date.now());
 }
 
+/** Accounts with a trade the table still shows open. */
+export function openTradeAccounts(): { accountId: number; accountName: string }[] {
+    return db.prepare('SELECT account_id AS accountId, MAX(account_name) AS accountName FROM trades WHERE closed_at IS NULL GROUP BY account_id')
+        .all() as { accountId: number; accountName: string }[];
+}
+
 /** Newest first (by close, else open); every account when accountIds is
  *  undefined. */
 export function loadTrades(o: { accountIds?: number[]; limit: number }): TradeRow[] {