Fix lot preview crash and improve key monitor WeChat alerts.

Unpack margin_one_lot correctly for fixed-amount sizing, use exchange klines for breakout detection, and notify on pending auto orders.

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

install_trading.py

@@ -3083,6 +3083,8 @@ def install_trading(app, *, login_required, require_nav, get_db, get_setting, se
                     schedule_ai_fn=schedule_ai_event_analysis,
                     db_path=DB_PATH,
                 )
+            else:
+                _notify(True, "委托已提交，待成交", entry=entry, sl=sl, tp=tp, lots=lots)
             _push_position_snapshot_async(fast=False)
             return True, "已下单" if filled else "委托已提交"
         except Exception as exc:

key_monitor_lib.py

@@ -165,7 +165,7 @@ def fetch_closed_bar(
             p,
             db_path=db_path,
             trading_mode=trading_mode,
-            prefer_ctp=True,
+            prefer_ctp=False,
         )
         bars = data.get("bars") or []
         return last_closed_bar(bars, bar_period_minutes(p))

position_sizing.py

@@ -82,7 +82,7 @@ def calc_lots_by_amount(
     if lots < 1:
         return None, f"按固定金额 {budget:.0f} 元，当前止损距离下不足 1 手", info
     if cap > 0:
-        margin_per_lot, _src = margin_one_lot(
+        margin_per_lot, _src, _spec = margin_one_lot(
             ths_code, entry_f, direction=direction, trading_mode=trading_mode,
         )
         if margin_per_lot <= 0:

static/js/trade.js

@@ -699,7 +699,12 @@
                 stop_loss: sl,
                 take_profit: tp
             })
-        }).then(function (r) { return r.json(); }).then(function (data) {
+        }).then(function (r) {
+            return r.json().then(function (data) {
+                if (!r.ok && data && !data.error) data.error = '请求失败 ' + r.status;
+                return data;
+            });
+        }).then(function (data) {
             if (!data.ok) {
                 if (isAmountMode()) {
                     lotsCalc.value = '';