个人资料交易记录中，增加销售统计模块

router_wallet.py

@@ -848,6 +848,54 @@ async def get_tip_stats(account: str, db: Session = Depends(get_db)):
         }
     }
 
+@router.get("/api/wallet/{account}/sales-stats")
+async def get_sales_stats(account: str, db: Session = Depends(get_db)):
+    """
+    📊 获取用户销售统计
+    - 销售收入：来自 earn_balance（累计销售收益）
+    - 购买支出：来自 PURCHASE 类型的交易记录
+    """
+    from sqlalchemy import func as sql_func
+    
+    # 获取钱包信息（用于读取 earn_balance）
+    wallet = db.query(Wallet).filter(Wallet.account == account).first()
+    
+    # 统计购买支出（PURCHASE类型交易）
+    purchase_stats = db.query(
+        sql_func.count(Transaction.tx_id).label('count'),
+        sql_func.coalesce(sql_func.sum(Transaction.amount), 0).label('total')
+    ).filter(
+        Transaction.account == account,
+        Transaction.tx_type == "PURCHASE"
+    ).first()
+    
+    # 统计退款收入（REFUND类型，作为购买支出的反向操作）
+    refund_stats = db.query(
+        sql_func.count(Transaction.tx_id).label('count'),
+        sql_func.coalesce(sql_func.sum(Transaction.amount), 0).label('total')
+    ).filter(
+        Transaction.account == account,
+        Transaction.tx_type == "REFUND"
+    ).first()
+    
+    total_sales = wallet.earn_balance or 0 if wallet else 0
+    total_purchase = abs(purchase_stats.total or 0)
+    purchase_count = purchase_stats.count or 0
+    
+    # 净销售 = 销售收入 - 购买支出
+    net_sales = total_sales - total_purchase
+    
+    return {
+        "status": "success",
+        "data": {
+            "total_sales": total_sales,
+            "sales_count": 0,  # 目前无法精确统计销售笔数（没有卖家交易记录）
+            "total_purchase": total_purchase,
+            "purchase_count": purchase_count,
+            "net_sales": net_sales
+        }
+    }
+
 # ==========================================
 # 🔄 P7后悔模式：退款API
 # ==========================================