add maxkb toggle

models.py

@@ -2,10 +2,17 @@ from tortoise.models import Model
 from tortoise import fields
 
 class PresetCode(Model):
-    """预设代码数据库模型"""
     id = fields.IntField(pk=True)
     query = fields.CharField(max_length=255, unique=True)
     code = fields.TextField()
-    
+
     class Meta:
         table = "preset_codes"
+
+
+class Setting(Model):
+    key = fields.CharField(max_length=100, pk=True)
+    value = fields.BooleanField()
+
+    class Meta:
+        table = "settings"