History of claimed paged rewards by era and validator.
This is keyed by era and validator stash which maps to the set of page indexes which have been claimed.
It is removed after [Config::HistoryDepth] eras.
Config::HistoryDepth
History of claimed paged rewards by era and validator.
This is keyed by era and validator stash which maps to the set of page indexes which have been claimed.
It is removed after [
Config::HistoryDepth] eras.