Possibility to clear backtrace

[GiovanniLR]

Hello,
I have a scenario where I want to log a set of statements only if the time difference between the first log and last log exceeds a limit.
I was thinking to do this by storing the messages in the backtrace and then dumping them or deleting them at the end depending on the condition. (I could store them in a data structure of mine but this would be more work.)
It seems to me currently it is not possible to clear the backtrace, is this correct ? (thinking of adding a spdlog::clear_backtrace)
is there another way this could be done ?
Thank you