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Correcting myself after a discussion with @ema: since we have up to 4 cache layers (at most), we should process any job with a root timestamp newer than 4 times the cache TTL cap. So anything older than 4 days should be safely discardable.
This would account for about 1% of jobs according to Gwicke's sampling, but I suspect that under large pressure the distribution could get significantly worse.
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