Systematics classifier performance vs. rotation period. Top left: reliability, defined as the fraction of random forest-selected signals that yield rotation periods consistent across >5 sectors, shown for several random forest probability thresholds. The classifier returns reliable detections across the full period range. Top right: completeness, defined as the fraction of all signals in the class that exceed the random forest probability threshold cuts. Completeness remains high for P_rot ≲ 10 days, but decreases at longer periods. These panels suggest that the systematics classifier is reliable at longer periods; however, the yield of such measurements declines beyond ∼10–13 days. Bottom left: the reliability of the negative class as a function of S_signal. Bottom right: the completeness of the negative class as a function of S_systematic.