OPERATION_DOCUMENT

query getCheckpoints($first: Int, $before: String, $last: Int, $after: String) {
  checkpoints(first: $first, after: $after, last: $last, before: $before) {
    pageInfo {
      startCursor
      endCursor
      hasNextPage
      hasPreviousPage
    }
    nodes {
      __typename
      ...RPC_Checkpoint_Fields
    }
  }
}

fragment RPC_Checkpoint_Fields on Checkpoint {
  digest
  epoch {
    epochId
  }
  rollingGasSummary {
    computationCost
    storageCost
    storageRebate
    nonRefundableStorageFee
  }
  networkTotalTransactions
  previousCheckpointDigest
  sequenceNumber
  timestamp
  validatorSignatures
  transactionBlocks {
    pageInfo {
      hasNextPage
      endCursor
    }
    nodes {
      digest
    }
  }
  endOfEpoch: transactionBlocks(last: 1, filter: {
    kind: SYSTEM_TX
  }
  ) {
    nodes {
      kind {
        __typename
        ... on EndOfEpochTransaction {
          transactions(last: 1) {
            nodes {
              __typename
              ... on ChangeEpochTransaction {
                epoch {
                  validatorSet {
                    activeValidators {
                      pageInfo {
                        hasNextPage
                        endCursor
                      }
                      nodes {
                        credentials {
                          protocolPubKey
                        }
                        votingPower
                      }
                    }
                  }
                  protocolConfigs {
                    protocolVersion
                  }
                  epochId
                }
              }
            }
          }
        }
      }
    }
  }
}