{
  "source_table": "ae",
  "grouping_column": "id",
  "transformation_type": "time_since",
  "time_units": "days",
  "from_first": false,
  "output_feature_name": "days_since_last_ae_visit",
  "date_column": "date",
  "cutoff_date": "2021-03-25",
  "absent_default_value": 2000
}
