feat: 新增回收站功能

- 数据库添加 is_deleted 和 deleted_at 字段
- 删除数据改为移动到回收站（软删除）
- 回收站支持查看、恢复、彻底删除
- 支持一键清空回收站
- 侧边栏添加回收站入口

xian_favor/db.py

@@ -61,6 +61,8 @@ class Database:
                     note TEXT,
                     is_starred INTEGER DEFAULT 0,
                     views INTEGER DEFAULT 0,
+                    is_deleted INTEGER DEFAULT 0,
+                    deleted_at TEXT,
                     created_at TEXT NOT NULL,
                     updated_at TEXT NOT NULL
                 )
@@ -131,6 +133,16 @@ class Database:
             except sqlite3.OperationalError:
                 cursor.execute("ALTER TABLE items ADD COLUMN views INTEGER DEFAULT 0")
             
+            # 检查并添加 is_deleted 和 deleted_at 字段（兼容旧数据库）
+            try:
+                cursor.execute("SELECT is_deleted FROM items LIMIT 1")
+            except sqlite3.OperationalError:
+                cursor.execute("ALTER TABLE items ADD COLUMN is_deleted INTEGER DEFAULT 0")
+            try:
+                cursor.execute("SELECT deleted_at FROM items LIMIT 1")
+            except sqlite3.OperationalError:
+                cursor.execute("ALTER TABLE items ADD COLUMN deleted_at TEXT")
+            
             conn.commit()
     
     # ============ Item 操作 ============
@@ -192,6 +204,9 @@ class Database:
             params = []
             conditions = []
             
+            # 只显示未删除的数据
+            conditions.append("i.is_deleted = 0")
+            
             # 标签过滤需要JOIN
             if tag:
                 query += " JOIN item_tags it ON i.id = it.item_id JOIN tags t ON it.tag_id = t.id"
@@ -329,13 +344,73 @@ class Database:
             return True
     
     def delete_item(self, item_id: int) -> bool:
-        """删除条目"""
+        """删除条目（移动到回收站）"""
         with self.get_conn() as conn:
             cursor = conn.cursor()
+            now = datetime.now().isoformat()
+            cursor.execute("UPDATE items SET is_deleted = 1, deleted_at = ? WHERE id = ?", (now, item_id))
+            conn.commit()
+            return cursor.rowcount > 0
+    
+    def list_trash(self, limit: int = 50, offset: int = 0) -> List[Dict[str, Any]]:
+        """列出回收站数据"""
+        with self.get_conn() as conn:
+            cursor = conn.cursor()
+            cursor.execute("SELECT * FROM items WHERE is_deleted = 1 ORDER BY deleted_at DESC LIMIT ? OFFSET ?", (limit, offset))
+            items = []
+            for row in cursor.fetchall():
+                item = dict(row)
+                item['tags'] = self._get_item_tags(conn, item['id'])
+                items.append(item)
+            return items
+    
+    def count_trash(self) -> int:
+        """计算回收站数据总数"""
+        with self.get_conn() as conn:
+            cursor = conn.cursor()
+            cursor.execute("SELECT COUNT(*) as count FROM items WHERE is_deleted = 1")
+            return cursor.fetchone()['count']
+    
+    def restore_item(self, item_id: int) -> bool:
+        """从回收站恢复数据"""
+        with self.get_conn() as conn:
+            cursor = conn.cursor()
+            cursor.execute("UPDATE items SET is_deleted = 0, deleted_at = NULL WHERE id = ?", (item_id,))
+            conn.commit()
+            return cursor.rowcount > 0
+    
+    def delete_permanently(self, item_id: int) -> bool:
+        """彻底删除数据（从数据库中删除）"""
+        with self.get_conn() as conn:
+            cursor = conn.cursor()
+            # 删除标签关联
+            cursor.execute("DELETE FROM item_tags WHERE item_id = ?", (item_id,))
+            # 删除邮件发送记录
+            cursor.execute("DELETE FROM email_logs WHERE item_id = ?", (item_id,))
+            # 删除数据
             cursor.execute("DELETE FROM items WHERE id = ?", (item_id,))
             conn.commit()
             return cursor.rowcount > 0
     
+    def empty_trash(self) -> int:
+        """清空回收站"""
+        with self.get_conn() as conn:
+            cursor = conn.cursor()
+            # 获取所有回收站数据ID
+            cursor.execute("SELECT id FROM items WHERE is_deleted = 1")
+            ids = [row['id'] for row in cursor.fetchall()]
+            
+            # 删除所有关联数据
+            for item_id in ids:
+                cursor.execute("DELETE FROM item_tags WHERE item_id = ?", (item_id,))
+                cursor.execute("DELETE FROM email_logs WHERE item_id = ?", (item_id,))
+            
+            # 删除所有回收站数据
+            cursor.execute("DELETE FROM items WHERE is_deleted = 1")
+            deleted_count = cursor.rowcount
+            conn.commit()
+            return deleted_count
+    
     def toggle_star(self, item_id: int) -> bool:
         """切换重点关注状态"""
         with self.get_conn() as conn: