func (s *Store) SetStakerDelegationsClaimedRewards(stakerID idx.StakerID, amount *big.Int) {
    err := s.table.StakerDelegationsOldRewards.Put(stakerID.Bytes(), amount.Bytes())
    if err != nil {
        s.Log.Crit("Failed to put key-value", "err", err)
    }