https://documentation.viafoura.com/reference/clearflags-1
Clear Chat Message Flags
Clears all flags previously made on a chat message.
clear chatmessageflags
https://queup.freshdesk.com/support/solutions/articles/67000202546-there-are-too-many-messages-in-the-chat-can-i-clear-it-
There are too many messages in the chat, can I clear it? : QueUp Knowledge Base