주식 매도 히스토리 API 추가 (/api/portfolio/sell-history)

- sell_history 테이블 신규 생성 (db.py init_db)
- CRUD 함수 추가: add_sell_history, get_sell_history, delete_sell_history
- GET /api/portfolio/sell-history (broker, days 필터)
- POST /api/portfolio/sell-history (id 포함 저장된 레코드 반환)
- DELETE /api/portfolio/sell-history/{record_id}

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

stock-lab/app/db.py

@@ -66,6 +66,23 @@ def init_db():
             )
         """)
 
+        conn.execute("""
+            CREATE TABLE IF NOT EXISTS sell_history (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                broker TEXT NOT NULL,
+                ticker TEXT NOT NULL,
+                name TEXT NOT NULL,
+                quantity INTEGER NOT NULL,
+                avg_price REAL NOT NULL,
+                sell_price REAL NOT NULL,
+                buy_amount REAL NOT NULL,
+                sell_amount REAL NOT NULL,
+                realized_profit REAL NOT NULL,
+                realized_rate REAL NOT NULL,
+                sold_at TEXT NOT NULL
+            )
+        """)
+
 def save_articles(articles: List[Dict[str, str]]) -> int:
     count = 0
     with _conn() as conn:
@@ -188,6 +205,49 @@ def upsert_asset_snapshot(date: str, total_eval: int, total_cash: int, total_ass
         """, (date, total_eval, total_cash, total_assets, now))
 
 
+# --- Sell History CRUD ---
+
+def add_sell_history(data: Dict[str, Any]) -> Dict[str, Any]:
+    with _conn() as conn:
+        cur = conn.execute("""
+            INSERT INTO sell_history
+                (broker, ticker, name, quantity, avg_price, sell_price,
+                 buy_amount, sell_amount, realized_profit, realized_rate, sold_at)
+            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+        """, (
+            data["broker"], data["ticker"], data["name"], data["quantity"],
+            data["avg_price"], data["sell_price"], data["buy_amount"],
+            data["sell_amount"], data["realized_profit"], data["realized_rate"],
+            data["sold_at"],
+        ))
+        row = conn.execute("SELECT * FROM sell_history WHERE id = ?", (cur.lastrowid,)).fetchone()
+        return dict(row)
+
+
+def get_sell_history(broker: str = None, days: int = None) -> List[Dict[str, Any]]:
+    conditions = []
+    params = []
+    if broker:
+        conditions.append("broker = ?")
+        params.append(broker)
+    if days:
+        conditions.append("sold_at >= datetime('now', ? || ' days')")
+        params.append(f"-{days}")
+    where = f"WHERE {' AND '.join(conditions)}" if conditions else ""
+    with _conn() as conn:
+        rows = conn.execute(
+            f"SELECT * FROM sell_history {where} ORDER BY sold_at DESC",
+            params,
+        ).fetchall()
+        return [dict(r) for r in rows]
+
+
+def delete_sell_history(record_id: int) -> bool:
+    with _conn() as conn:
+        cur = conn.execute("DELETE FROM sell_history WHERE id = ?", (record_id,))
+        return cur.rowcount > 0
+
+
 def get_asset_snapshots(days: int = 30) -> List[Dict[str, Any]]:
     with _conn() as conn:
         if days == 0: