Depends on how afflicted you are with OCD :). Or how much value you put on having historical data to refer to. A while back I had several months’ worth of data that were based on (incorrect) running pace TSS rather than heart rate. The bulk recalculate option [1] might help you out, or you might have to do some of it manually.
[1] https://help.trainingpeaks.com/hc/en-us/articles/205230130-Bulk-Recalculate-TSS-TSS-backfiller-