feat:表达方式更新，现在会训练朴素贝叶斯模型来预测使用什么表达

src/common/database/database_model.py

@@ -303,11 +303,10 @@ class Expression(BaseModel):
 
     situation = TextField()
     style = TextField()
-    count = FloatField()
 
     # new mode fields
     context = TextField(null=True)
-    context_words = TextField(null=True)
+    up_content = TextField(null=True)
 
     last_active_time = FloatField()
     chat_id = TextField(index=True)