feat: 交易记录增加保证金占比与最新资金，上方展示资金曲线

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

trade_log_lib.py

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+"""交易记录：字段补全、资金曲线数据。"""
+from __future__ import annotations
+
+from typing import Any
+
+
+TRADE_LOG_EXTRA_COLUMNS = (
+    "ALTER TABLE trade_logs ADD COLUMN margin_pct REAL",
+    "ALTER TABLE trade_logs ADD COLUMN equity_after REAL",
+)
+
+
+def ensure_trade_log_columns(conn) -> None:
+    for sql in TRADE_LOG_EXTRA_COLUMNS:
+        try:
+            conn.execute(sql)
+        except Exception:
+            pass
+
+
+def calc_equity_after(capital: float, pnl_net: float) -> float | None:
+    cap = float(capital or 0)
+    if cap <= 0:
+        return None
+    return round(cap + float(pnl_net or 0), 2)
+
+
+def enrich_trades_for_records(
+    trades: list[dict[str, Any]],
+    *,
+    initial_capital: float = 0.0,
+) -> tuple[list[dict[str, Any]], list[dict[str, Any]]]:
+    """表格仍按 id 降序；资金曲线按平仓时间升序用最新资金绘制。"""
+    rows = [dict(t) for t in trades]
+    chrono = sorted(
+        rows,
+        key=lambda t: ((t.get("close_time") or ""), int(t.get("id") or 0)),
+    )
+    running = float(initial_capital or 0)
+    curve: list[dict[str, Any]] = []
+
+    for t in chrono:
+        pnl_net = float(t.get("pnl_net") or 0)
+        eq = t.get("equity_after")
+        if eq is None:
+            if running > 0:
+                eq = round(running + pnl_net, 2)
+            else:
+                eq = None
+            t["equity_after"] = eq
+        if eq is not None:
+            running = float(eq)
+
+        if t.get("margin_pct") is None:
+            margin = float(t.get("margin") or 0)
+            cap_before = float(eq or 0) - pnl_net if eq is not None else 0.0
+            if margin > 0 and cap_before > 0:
+                t["margin_pct"] = round(margin / cap_before * 100, 2)
+
+        if eq is not None:
+            curve.append({
+                "time": (t.get("close_time") or "")[:19],
+                "value": float(eq),
+                "id": int(t.get("id") or 0),
+            })
+
+    return rows, curve