DataSource versioning

[evanp]

In working with ISO 3166-1 data, I realized that the data source has multiple versions. I modeled it in our database as one DataSource for each version, but maybe we want to have a way to say that different versions of the same data source are related. I don't think it's required right now, but I wanted to note it here.

[yeozy95]

+1

Just to add, there might be 2 different types of data source versioning here.

1. Minor updates to the data source (intra-year updates). E.g., Changes along the year made to a set of data such as CDP Cities 2021 Targets
2. Major updates to the data source (inter-year updates). E.g., Going from CDP Cities 2021 Targets to CDP Cities 2022 Targets