Actually, what you said is not entirely right. Chat records exist in msg2.0.db When you delete the chat records, you find that the files have not become smaller. This is actually a lax statement.

Actually, that's it. If you are online in QQ (just log in to QQ), the size of this file will not change, and deleting records will not affect it. If you turn off QQ and log in again, you will find that msg2.0.db will become smaller, even like being reborn.

In addition, if you accidentally delete the record, there is no way to recover it for the time being. If you are a member, you can turn on the roaming function of chat records, so that the chat records will be saved on Tencent's server without worrying about losing them.