Held-overnight is the filter
Intraday volume spikes often close out the same day. Whale Map's OI pins compare open interest across sessions from retained chain snapshots, so a pin means new contracts were opened and still existed the next day — positioning, not churn.
Two independent contexts, one chart
Congressional disclosures and options positioning have nothing to do with each other mechanically — which is why seeing both on the same price axis is useful. When they cluster around the same period, that is worth your research time; the map never claims it is worth your money.
Lags and limits, on the label
Congressional pins carry the up-to-45-day filing lag and STOCK Act amount ranges. OI surges come from ConvexRadar's own snapshot history, not a licensed tape. Both limits are printed on the page because context you can trust beats signals you cannot.