Perhaps the very simplest mechanism would be to write an empty file with the failing IDs as filenames into a local directory when you read them.
Each time you read a successful ID, you can use -e to see if it has had a previous failure. If it has, you can now unlink that file.
Later, you can then use the creation timestamps on the files to delete any that are more than 8 hours old. This could even be done by a separate process that scans the directory on a regular basis via cron.
It's simple, persistant, requires nothing beyond Perl itself, and should be easily fast enough to cater for 6 lookups per second.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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