Review charts: M1/M5/M15/H1 bar counts 500/200/100/50; simplify markers.

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

app/routes.py

@@ -928,27 +928,29 @@ def register_routes(app: Flask) -> None:
                 flash("记录不存在或无权查看", "error")
                 return redirect(url_for("records_page"))
             _annotate_trade_times(trade)
-            # 各周期不同前后窗口，避免 M1 过密、H1 过稀
+            # 按目标根数取足够时间窗：M1=500, M5=200, M15=100, H1=50
             open_ts = float(
                 trade.get("open_time") or trade.get("created_at") or database.now()
             )
             close_raw = trade.get("close_time")
             close_ts = float(close_raw) if close_raw not in (None, "") else open_ts
-            tf_pad = {
-                "M1": 90 * 60,      # ±90 分钟
-                "M5": 4 * 3600,     # ±4 小时
-                "M15": 8 * 3600,    # ±8 小时
-                "H1": 24 * 3600,    # ±1 天
+            # 秒/根 × 目标根数，再略留余量
+            tf_span = {
+                "M1": 500 * 60,
+                "M5": 200 * 5 * 60,
+                "M15": 100 * 15 * 60,
+                "H1": 50 * 3600,
             }
             charts = {}
             for tf in ("M1", "M5", "M15", "H1"):
-                pad = tf_pad[tf]
+                span = tf_span[tf]
+                mid = (min(open_ts, close_ts) + max(open_ts, close_ts)) / 2.0
                 charts[tf] = database.get_bars(
                     conn,
                     trade["symbol"],
                     tf,
-                    min(open_ts, close_ts) - pad,
-                    max(open_ts, close_ts) + pad,
+                    mid - span / 2.0,
+                    mid + span / 2.0,
                 )
         return render_template(
             "record_detail.html",