> Are the data races on these flags harmful? Perhaps not. For example, in the evening we might shut down all transaction-processing threads and then select 10 r

> Are the data races on these flags harmful? Perhaps not. For example, in the evening we might shut down all transaction-processing threads and then select 10 random accounts that are flagged as having had activity for manual auditing. For this purpose, the data races are entirely harmless. My understanding of data races like that is that they can cause UB by, for example, leading the reader to take neither side of an if/else branch. If something can cause UB depending on timing, that seems like it must be a race condition too.