add maxkb toggle

database.py

@@ -1,5 +1,5 @@
 from tortoise.contrib.fastapi import register_tortoise
-from models import PresetCode
+from models import PresetCode, Setting
 from schemas import PresetCodeCreate, PresetCodeResponse
 from typing import List, Optional
 
@@ -38,10 +38,20 @@ class DatabaseService:
     
     @staticmethod
     async def delete_code(code_id: int) -> bool:
-        """删除指定 ID 的代码"""
         code = await PresetCode.get_or_none(id=code_id)
         if not code:
             return False
-        
         await code.delete()
         return True
+
+    @staticmethod
+    async def get_maxkb_enabled() -> bool:
+        setting, _ = await Setting.get_or_create(key="maxkb_enabled", defaults={"value": True})
+        return setting.value
+
+    @staticmethod
+    async def toggle_maxkb_enabled() -> bool:
+        setting, _ = await Setting.get_or_create(key="maxkb_enabled", defaults={"value": True})
+        setting.value = not setting.value
+        await setting.save()
+        return setting.value