What is the correct temporal alignment for a 'next-bar' target in time series ML?

Question

MLQuiz · Accepted Answer

Target = (Close_{t+1} > Close_t) uses future data — but ONLY for the label. All features must use data ≤ t. Any feature using t+1 data (e.g., High_{t+1}) creates leakage, inflating accuracy to 98% in research papers.