Traffic crash involved-person roles and injury outcomes

Anonymous person-grain rows link each involved person to the crash through crash_record_id and expose person_type, seat_no, safety_equipment, airbag_deployed, ejection, injury_classification, hospital, EMS agency, and crash date. This is primary official recorded evidence for involved-person roles, occupant safety and ejection, reported injury severity, and scene transport in CPD-jurisdiction Chicago crashes. Retain crash_record_id and person_id, Chicago coverage, and extraction or metadata time because fatality classifications may be revised for up to 30 days and no row-level code-list version is exposed.