fix app.py message size (>2000)

app.py

@@ -109,7 +109,7 @@ async def on_message(message):
     llm_answer: str = llm_output(question, db_knn['matches'][0]['metadata']['text'])      # for the highest knn result (for the test only right now)  TODO: make this better
 
     try:
-        await message.reply(content=llm_answer, view=Like_Dislike())
+        await message.reply(content=llm_answer[:1990], view=Like_Dislike())             # TODO: handle large responses (>2000)
         await message.reply(content=db_knn['matches'][0]['metadata']['text'])
     except Exception as e:                                                           # TODO: make exception handling better
         print(e)