diff --git a/api/models/model.py b/api/models/model.py
index ed1be14a6..53646c015 100644
--- a/api/models/model.py
+++ b/api/models/model.py
@@ -522,33 +522,6 @@ class AppModelConfig(Base):
         self.file_upload = json.dumps(model_config.get("file_upload")) if model_config.get("file_upload") else None
         return self
 
-    def copy(self):
-        new_app_model_config = AppModelConfig(
-            id=self.id,
-            app_id=self.app_id,
-            opening_statement=self.opening_statement,
-            suggested_questions=self.suggested_questions,
-            suggested_questions_after_answer=self.suggested_questions_after_answer,
-            speech_to_text=self.speech_to_text,
-            text_to_speech=self.text_to_speech,
-            more_like_this=self.more_like_this,
-            sensitive_word_avoidance=self.sensitive_word_avoidance,
-            external_data_tools=self.external_data_tools,
-            model=self.model,
-            user_input_form=self.user_input_form,
-            dataset_query_variable=self.dataset_query_variable,
-            pre_prompt=self.pre_prompt,
-            agent_mode=self.agent_mode,
-            retriever_resource=self.retriever_resource,
-            prompt_type=self.prompt_type,
-            chat_prompt_config=self.chat_prompt_config,
-            completion_prompt_config=self.completion_prompt_config,
-            dataset_configs=self.dataset_configs,
-            file_upload=self.file_upload,
-        )
-
-        return new_app_model_config
-
 
 class RecommendedApp(Base):
     __tablename__ = "recommended_apps"
diff --git a/api/services/app_generate_service.py b/api/services/app_generate_service.py
index 6792324ec..3861764f1 100644
--- a/api/services/app_generate_service.py
+++ b/api/services/app_generate_service.py
@@ -55,7 +55,7 @@ class AppGenerateService:
                 cls.system_rate_limiter.increment_rate_limit(app_model.tenant_id)
 
         # app level rate limiter
-        max_active_request = AppGenerateService._get_max_active_requests(app_model)
+        max_active_request = cls._get_max_active_requests(app_model)
         rate_limit = RateLimit(app_model.id, max_active_request)
         request_id = RateLimit.gen_request_key()
         try: