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Unbound has "prefetch" which will refresh near-expired cached records, and various other cache/ttl knobs. "serve-expired" seemed to work well too

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I use both of those as well in Unbound.

I was thinking that if you preload your 50k list and override the min-ttl, the prefetch would let you relax the cron schedule a little

I could but I like to run everything in cron hourly to force trigger the retry mechanisms on the expired records and make a bunch of noise so that my network always looks active.

It's just a "me" thing. Others can and should do whatever they think will work for them. If everyone does this a little different that is probably best.

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