The fact in which flags/dates are maintained for each state of the fact event is an example of

Accumulating snapshot facts track the entire lifecycle of a business process by maintaining date/timestamp flags for each state or milestone. Unlike transaction facts (single event) or periodic snapshots (state at fixed intervals), accumulating snapshots have multiple date columns that get updated as the process progresses through each stage - e.g., order_date, ship_date, delivery_date in an order pipeline.