[BlackLotus89]

What about versioning/historical data? Would be interesting as well and with daily checks this should be possible in a fine grained way

[M2Ys4U]

Wikidata has qualifiers and ranks which can be added to statements that can be used for this.

As an example, Barbados:

(statement) head of state (P35): Queen Elizabeth II (Q9682)

(qualifier) start time (P580): 30 November 1966

(qualifier) end time (P582): 29 November 2021

(statement) head of state (P35): Sandra Mason (Q9333540)

(qualifier) start time (P582): 30 November 2021

the second statement then has the "preferred" rank (the first has a "normal" rank, and there is also a "deprecated" rank for inaccurate information)

See https://www.wikidata.org/wiki/Q244#P35 for a better visualisation than HN's comment allows