[Idea] Check the pending authorization list backwards

[fe-ax]

Maybe it's a good idea to check the pending auth list backwards limiting at 300 pending authorizations found. This reduces load at Let's Encrypt and saves time for the checker.

[alexzorin]

Good idea. The grep -R method of collecting logs will have to change, though, since that basically produces a random order, forcing us to do a full scan.

[fe-ax]

I think the challenge id is sequential (e.g. 569414841 569414842). After indexing the id’s it could be ordered high to low