新增异常产品管理功能

- 新增 abnormal_products 数据库表
- 内容库和互联网均无搜索结果时存入异常库
- 新增异常产品 API：
  - GET /api/products/abnormal - 获取异常产品列表
  - GET /api/products/abnormal/<product_name> - 获取异常产品详情
  - POST /api/products/abnormal/<product_name>/resolve - 解决异常产品
  - DELETE /api/products/abnormal/<product_name> - 删除异常产品记录
  - POST /api/products/abnormal/<product_name>/retry - 重试处理
- 更新 README 文档

models/database.py

@@ -204,9 +204,30 @@ class Database:
                 )
             ''')
             
+            # 异常产品表
+            cursor.execute('''
+                CREATE TABLE IF NOT EXISTS abnormal_products (
+                    id INTEGER PRIMARY KEY AUTOINCREMENT,
+                    product_name TEXT NOT NULL UNIQUE,
+                    category TEXT,
+                    subcategory TEXT,
+                    abnormal_type TEXT DEFAULT 'no_search_results',
+                    abnormal_reason TEXT,
+                    search_results TEXT,
+                    retry_count INTEGER DEFAULT 0,
+                    status TEXT DEFAULT 'pending',
+                    resolution TEXT,
+                    resolved_at DATETIME,
+                    resolved_by TEXT,
+                    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+                    last_retry_at DATETIME
+                )
+            ''')
+            
             # 创建索引
             cursor.execute('CREATE INDEX IF NOT EXISTS idx_process_steps_session ON process_steps(process_id)')
             cursor.execute('CREATE INDEX IF NOT EXISTS idx_process_sessions_status ON process_sessions(status)')
+            cursor.execute('CREATE INDEX IF NOT EXISTS idx_abnormal_products_status ON abnormal_products(status)')
             
             conn.commit()
 
@@ -830,5 +851,99 @@ class Database:
             intervention_data=intervention_data
         )
 
+# ========== 异常产品操作 ==========
+    def add_abnormal_product(self, product_name, category=None, subcategory=None, 
+                            abnormal_type='no_search_results', abnormal_reason=None, 
+                            search_results=None):
+        """添加异常产品"""
+        with self.get_connection() as conn:
+            cursor = conn.cursor()
+            try:
+                cursor.execute('''
+                    INSERT INTO abnormal_products 
+                    (product_name, category, subcategory, abnormal_type, abnormal_reason, search_results)
+                    VALUES (?, ?, ?, ?, ?, ?)
+                ''', (product_name, category, subcategory, abnormal_type, abnormal_reason,
+                      json.dumps(search_results, ensure_ascii=False) if search_results else None))
+                conn.commit()
+                return cursor.lastrowid
+            except sqlite3.IntegrityError:
+                # 产品已存在，更新重试次数
+                cursor.execute('''
+                    UPDATE abnormal_products 
+                    SET retry_count = retry_count + 1, 
+                        last_retry_at = CURRENT_TIMESTAMP,
+                        abnormal_reason = ?,
+                        search_results = ?
+                    WHERE product_name = ?
+                ''', (abnormal_reason, 
+                      json.dumps(search_results, ensure_ascii=False) if search_results else None,
+                      product_name))
+                conn.commit()
+                return None
+    
+    def get_abnormal_products(self, limit=100, status='pending'):
+        """获取异常产品列表"""
+        with self.get_connection() as conn:
+            cursor = conn.cursor()
+            if status == 'all':
+                cursor.execute('''
+                    SELECT * FROM abnormal_products 
+                    ORDER BY created_at DESC 
+                    LIMIT ?
+                ''', (limit,))
+            else:
+                cursor.execute('''
+                    SELECT * FROM abnormal_products 
+                    WHERE status = ?
+                    ORDER BY created_at DESC 
+                    LIMIT ?
+                ''', (status, limit))
+            return [dict(row) for row in cursor.fetchall()]
+    
+    def get_abnormal_count(self, status='pending'):
+        """获取异常产品数量"""
+        with self.get_connection() as conn:
+            cursor = conn.cursor()
+            if status == 'all':
+                cursor.execute('SELECT COUNT(*) FROM abnormal_products')
+            else:
+                cursor.execute('SELECT COUNT(*) FROM abnormal_products WHERE status = ?', (status,))
+            return cursor.fetchone()[0]
+    
+    def resolve_abnormal_product(self, product_name, resolution, resolved_by='manual'):
+        """标记异常产品为已解决"""
+        with self.get_connection() as conn:
+            cursor = conn.cursor()
+            cursor.execute('''
+                UPDATE abnormal_products 
+                SET status = 'resolved', 
+                    resolution = ?, 
+                    resolved_by = ?,
+                    resolved_at = CURRENT_TIMESTAMP
+                WHERE product_name = ?
+            ''', (resolution, resolved_by, product_name))
+            conn.commit()
+            return cursor.rowcount > 0
+    
+    def delete_abnormal_product(self, product_name):
+        """删除异常产品记录"""
+        with self.get_connection() as conn:
+            cursor = conn.cursor()
+            cursor.execute('DELETE FROM abnormal_products WHERE product_name = ?', (product_name,))
+            conn.commit()
+            return cursor.rowcount > 0
+    
+    def get_abnormal_product(self, product_name):
+        """获取异常产品详情"""
+        with self.get_connection() as conn:
+            cursor = conn.cursor()
+            cursor.execute('SELECT * FROM abnormal_products WHERE product_name = ?', (product_name,))
+            row = cursor.fetchone()
+            result = dict(row) if row else None
+            if result and result.get('search_results'):
+                result['search_results'] = json.loads(result['search_results'])
+            return result
+
 # 全局数据库实例
 db = Database()