Deleting old message IDs in Telegram

[002love]

I have a question rather than a problem.

Can you tell me if my bot sends more than 100k messages per month, but it needs a long-term memory of messages. For example, in 3 months I need to retrieve a file that my bot sent 3 months ago, so by that time it will have sent more than 400k messages.

Question:
Will the ID of this file not be deleted from the bot? Will I be able to retrieve this file as before or will I get an error?