[futures] How to order HTTP API responses combined with websocket responses?

Say I get a websocket user data update for ACCOUNT_UPDATE which contains event timestamps.
Then I call the REST endpoint “/fapi/v2/account” which also returns account information but does not contain any timestamps.

Both of these pieces of data refer to the same underlying thing, but how can I tell which bit of information is the most current, when the REST endpoint doesn’t return a timestamp?

Cheers, Paul.

The data from ACCOUNT_UPDATE is the most up-to-date

Would it be possible to add an event timestamp to all REST responses, in line with the socket messages?