move vector_db line of code

app.py

@@ -89,7 +89,7 @@ async def on_chat_start():
             timeout=180,
             max_files=10
         ).send()
-
+    vector_db = VectorDatabase()
     for file in files:
 
         msg = cl.Message(
@@ -103,7 +103,7 @@ async def on_chat_start():
         print(f"Processing {len(texts)} text chunks")
 
         # Create a dict vector store
-        vector_db = VectorDatabase()
+        
         vector_db = await vector_db.abuild_from_list(texts)
         
     chat_openai = ChatOpenAI()