Add PostgreSQL production backend to eliminate SQLite lock contention.

Support DATABASE_URL with connection pooling, pg_dump backups, SQLite migration script, and deploy_postgres.sh with docs.

Co-authored-by: Cursor <cursoragent@cursor.com>

static/js/trade.js

@@ -331,7 +331,9 @@
             }
             var syncing = data.sync_state === 'syncing';
             var hadPos = lastPosRowCount > 0 || !!list.querySelector('.pos-card');
-            if (syncing || hadPos) {
+            var marginOpen = Number(data.margin_used) > 0;
+            var riskActive = data.risk_status && Number(data.risk_status.active_count) > 0;
+            if (syncing || hadPos || marginOpen || riskActive) {
                 if (syncBadge) {
                     syncBadge.hidden = false;
                     syncBadge.textContent = data.sync_label || '持仓同步中…';
@@ -543,8 +545,8 @@
         var hint = document.getElementById('ctp-auto-hint');
         if (hint) {
             hint.textContent = ctpAutoConnectEnabled
-                ? '断线自动重连 · 开盘前 30 分钟自动连接'
-                : '自动连接已关闭 · 开盘前 30 分钟仍会按计划连接';
+                ? '交易时段断线自动重连 · 开盘前 30 分钟检查连接 · 不自动强制断开'
+                : '自动连接已关闭 · 盘前 30 分钟及交易时段仍会按计划连接 · 断开请手动操作';
         }
         if (btnConnect && !ctpAutoConnectEnabled) {
             btnConnect.disabled = true;