On 24 February, the source wrote (citation (pdf)):

The monthly CPI data for 2019 have been revised following the rebasing of the CPI from base year of 2014 to base year of 2019. The rebasing exercise included changes to the weights as well as the sample of items and outlets selected for the compilation of the CPI.

In response, we have:

1. Archived the predecessors (2014=100, as early as 1961m1 to 2019m12) by renaming with an "_14" specifier, marking metadata as "discontinued", and segregating in the catalog.
2. Created one-for-one replacements (2019=100).
3. Transplanted the global concept alias.

Notable properties (for full list, see background):

• Base period: From 2014 to 2019
• Start date: Unchanged

The series reside in the historical catalog:

• Singapore » Price » Consumer price index » 2019=100, from 1961
• Singapore » Price » Consumer price index » Discontinued » 2014=100, 1961 to 2019

References

• Singapore Consumer Price Index for January 2020 (pdf)
• Rebasing of the Consumer Price Index (2019 as Base Year) (pdf)