Also judging by your blog you might like something like
PROMPT_COMMAND="${PROMPT_COMMAND:+$PROMPT_COMMAND ; }"'echo $$ $USER \ "$(pwd) $(history 1)" >> ~/.bash_eternal_history'
Also, in the blog post I linked to the link you mention.
Yeah, I now noticed that you already put that link in the blog.
Also judging by your blog you might like something like
in your .bashrc, so that you don't have to abuse the bash-history for keeping a lifetime of commands around.