save archive start time and check if visits since start time before invalidating and archiving #16852
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Description:
@tsteur thought of this possible optimization while checking the ttl change. Checks for visits from start time of last archive to end of period, and if not found, doesn't invalidate/archive. If you think it's worth finishing I can finish it.
Should only be applied to periods that include today (I think that's not the case currently in the PR, it also applies to yesterday, but it's WIP)...
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