{
  "expected_after_rows": 2010,
  "actual_after_rows": 2010,
  "expected_before_rows": 1560,
  "actual_before_rows": 1560,
  "duplicates": 0,
  "pre_definition": "history-only model; no day-1 before for scratch/classical because no source model",
  "post_definition": "history plus current session excluding held-out trial; strict LOTO"
}