Pgvector fixes

src/vanna/pgvector/pgvector.py

@@ -251,15 +251,3 @@ def remove_collection(self, collection_name: str) -> bool:
 
     def generate_embedding(self, *args, **kwargs):
         pass
-
-    def submit_prompt(self, *args, **kwargs):
-        pass
-
-    def system_message(self, message: str) -> any:
-        return {"role": "system", "content": message}
-
-    def user_message(self, message: str) -> any:
-        return {"role": "user", "content": message}
-
-    def assistant_message(self, message: str) -> any:
-        return {"role": "assistant", "content": message}