'the based on ticket purchase records'

The officer will escort entrants to a triage center right across from the station, which keeps track of their travel schedules based on ticket purchase records.

Which one do you native English speakers think 'the based on ticket purchase records' modify, 'keeps track' or 'schedules' or both are possible and they carry the same meaning?

What do you native English speakers think? Thank you so much as usual in advance.