Did you see my suggestion about just adding startat=xxxx to the url to not do the similar threads from the beginning? When you do the rebuild, it automatically does xxxx threads at a time (default is 100). So, if you know that you just want to rebuild the last 10 threads, why not just do startat=(your lastest thread number - 10) ? Your alternative is to rewrite the code to go backwards (redo how $finishat is handled and redo the query), as I said.
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