That graph would look much less dramatic if you could plot cases in foreign worker dorms (which have been isolated and are subject to an intense testing and clearance regime[1]) separately from cases in the broader community.

As of yesterday's report[2], dorm cases account for 45,260 of the 48,035 total cases. Incidence in the ex-dorm population is only 0.04%, and fewer than half of those have unknown chains of transmission.

1. Which is, admittedly, a separate issue in and of itself.

2. https://covidsitrep.moh.gov.sg