How to correctly implement the system of unread messages in a group chat?

Question

Python

Tell me what is the best method for implementing a system of unread chat messages
. when sending a message, I want to take into account those people who did not read and read this message (Read means to be in the chat at the time the message was sent, if the person in the chat is automatically connected to the web socket of this chat), further process and display this information on site.

Answer 1

Well, for example, for each user-chat pair, store a timestamp for disconnecting from the chat (or equivalent event). Then all messages that were added to the chat after this label will be considered unread.