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validated_tx table was well over capacity. The validated_bk table was well below. This explained why set_connected(tx) population run accelerated significantly after a certain value. The link had overflowed, resulting in logical failures (which are fast). I'm summing up logical results, but there are expected failures due to the simulation. So after updating the build, the set connected run took 28 mins vs 9. All still constant time. This is still well within criteria, especially given that these calls will run concurrently.