A question: Why it is not possible, also for the witness rewards to fetch the All time value, like with the other reward categories?
Because all time values for author and curation reward is provided by the blockchain in a simple API call but the same is not true for witness rewards as far as I am aware and would require to fetch the whole history of an account. (Which is not really ideal, we wouldn't want to bombard public RPCs like that.)
we wouldn't? at least someone would be using them. ;)
I mean, it already bombards them enough 😆
What about hivesql or hafsql?
Those APIs also don't have an easy here all the witness rewards this account have received call.