Because (some of) the values change over time (the Relative field and the semantics) and the entities to sync can change over time (if you donāt choose a start year). The latter can be useful as it will save you from having to generate new data every year.
Because integrations provide only read-only values.
If you donāt need the afore-mentioned functionality, then you can sync once and then disconnect, and it will behave like a normal db.
Even if you donāt disconnect, you can augment the db with whatever fields you like, including a āTypeā field, but indeed, the integration wonāt be super useful if your definition of a Year is not the ISO definition of a year (and we werenāt aiming to address all possible use cases - tax years, fiscal years, etc.)
You can add the formula described here:
(but the numbers would only really be meaningful for entities of the Day type)