feat: add trade_id + full trade record to trade_results

Each buy generates a UUID trade_id stored in positions table.
Each sell links via same trade_id in trade_results, enabling
round-trip grouping of buy→sell pairs.

Additional fields saved per trade:
- fee_krw: commission amount (0.05% each side)
- krw_profit: net KRW profit/loss after fees
- buy_price / sell_price: exact prices
- invested_krw: capital deployed
- sell_reason: trailing stop / time stop / etc.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

core/price_db.py

@@ -112,6 +112,7 @@ def upsert_position(
     amount: float,
     invested_krw: int,
     entry_time: str,  # ISO 포맷 문자열
+    trade_id: str = "",
 ) -> None:
     """포지션 저장 또는 갱신 (MERGE)."""
     sql = """
@@ -124,9 +125,9 @@ def upsert_position(
                        invested_krw = :invested_krw,
                        updated_at   = SYSTIMESTAMP
         WHEN NOT MATCHED THEN
-            INSERT (ticker, buy_price, peak_price, amount, invested_krw, entry_time)
+            INSERT (ticker, buy_price, peak_price, amount, invested_krw, entry_time, trade_id)
             VALUES (:ticker, :buy_price, :peak_price, :amount, :invested_krw,
-                    TO_TIMESTAMP(:entry_time, 'YYYY-MM-DD"T"HH24:MI:SS.FF6'))
+                    TO_TIMESTAMP(:entry_time, 'YYYY-MM-DD"T"HH24:MI:SS.FF6'), :trade_id)
     """
     with _conn() as conn:
         conn.cursor().execute(sql, {
@@ -136,6 +137,7 @@ def upsert_position(
             "amount": amount,
             "invested_krw": invested_krw,
             "entry_time": entry_time,
+            "trade_id": trade_id,
         })
 
 
@@ -170,12 +172,37 @@ def ensure_trade_results_table() -> None:
                     raise
 
 
-def record_trade(ticker: str, is_win: bool, pnl_pct: float) -> None:
-    """거래 결과 저장."""
+def record_trade(
+    ticker: str,
+    is_win: bool,
+    pnl_pct: float,
+    fee_krw: float = 0.0,
+    krw_profit: float = 0.0,
+    trade_id: str = "",
+    buy_price: float = 0.0,
+    sell_price: float = 0.0,
+    invested_krw: int = 0,
+    sell_reason: str = "",
+) -> None:
+    """거래 결과 저장 (수수료·KRW 손익·trade_id 포함)."""
     with _conn() as conn:
         conn.cursor().execute(
-            "INSERT INTO trade_results (ticker, is_win, pnl_pct) VALUES (:t, :w, :p)",
-            {"t": ticker, "w": 1 if is_win else 0, "p": round(pnl_pct, 4)},
+            "INSERT INTO trade_results "
+            "(ticker, is_win, pnl_pct, fee_krw, krw_profit, "
+            " trade_id, buy_price, sell_price, invested_krw, sell_reason) "
+            "VALUES (:t, :w, :p, :f, :k, :tid, :bp, :sp, :ikrw, :sr)",
+            {
+                "t": ticker,
+                "w": 1 if is_win else 0,
+                "p": round(pnl_pct, 4),
+                "f": round(fee_krw, 2),
+                "k": round(krw_profit, 2),
+                "tid": trade_id,
+                "bp": buy_price,
+                "sp": sell_price,
+                "ikrw": invested_krw,
+                "sr": sell_reason,
+            },
         )
 
 
@@ -250,7 +277,8 @@ def load_positions() -> list[dict]:
     """저장된 전체 포지션 로드."""
     sql = """
         SELECT ticker, buy_price, peak_price, amount, invested_krw,
-               TO_CHAR(entry_time, 'YYYY-MM-DD"T"HH24:MI:SS.FF6') AS entry_time
+               TO_CHAR(entry_time, 'YYYY-MM-DD"T"HH24:MI:SS.FF6') AS entry_time,
+               trade_id
           FROM positions
     """
     with _conn() as conn:
@@ -265,6 +293,7 @@ def load_positions() -> list[dict]:
             "amount": float(r[3]),
             "invested_krw": int(r[4]),
             "entry_time": r[5],
+            "trade_id": r[6] or "",
         }
         for r in rows
     ]