Use int64 for blockNum (like it's sroted in DB)

common/batch.go

@@ -13,7 +13,7 @@ const batchNumBytesLen = 4
 // Batch is a struct that represents Hermez network batch
 type Batch struct {
 	BatchNum      BatchNum             `meddler:"batch_num"`
-	EthBlockNum   uint64               `meddler:"eth_block_num"` // Ethereum block in which the batch is forged
+	EthBlockNum   int64                `meddler:"eth_block_num"` // Ethereum block in which the batch is forged
 	ForgerAddr    ethCommon.Address    `meddler:"forger_addr"`   // TODO: Should this be retrieved via slot reference?
 	CollectedFees map[TokenID]*big.Int `meddler:"fees_collected,json"`
 	StateRoot     Hash                 `meddler:"state_root"`

common/bid.go

@@ -11,5 +11,5 @@ type Bid struct {
 	SlotNum     SlotNum           `meddler:"slot_num"`
 	ForgerAddr  ethCommon.Address `meddler:"forger_addr"` // Coordinator reference
 	BidValue    *big.Int          `meddler:"bid_value,bigint"`
-	EthBlockNum uint64            `meddler:"eth_block_num"`
+	EthBlockNum int64             `meddler:"eth_block_num"`
 }

common/block.go

@@ -8,7 +8,8 @@ import (
 
 // Block represents of an Ethereum block
 type Block struct {
-	EthBlockNum uint64         `meddler:"eth_block_num"`
+	EthBlockNum int64          `meddler:"eth_block_num"`
 	Timestamp   time.Time      `meddler:"timestamp"`
 	Hash        ethCommon.Hash `meddler:"hash"`
+	ParentHash  ethCommon.Hash `meddler:"-"`
 }

db/historydb/historydb.go

@@ -48,7 +48,7 @@ func (hdb *HistoryDB) AddBlock(block *common.Block) error {
 }
 
 // GetBlock retrieve a block from the DB, given a block number
-func (hdb *HistoryDB) GetBlock(blockNum uint64) (*common.Block, error) {
+func (hdb *HistoryDB) GetBlock(blockNum int64) (*common.Block, error) {
 	block := &common.Block{}
 	err := meddler.QueryRow(
 		hdb.db, block,
@@ -58,7 +58,7 @@ func (hdb *HistoryDB) GetBlock(blockNum uint64) (*common.Block, error) {
 }
 
 // GetBlocks retrieve blocks from the DB, given a range of block numbers defined by from and to
-func (hdb *HistoryDB) GetBlocks(from, to uint64) ([]*common.Block, error) {
+func (hdb *HistoryDB) GetBlocks(from, to int64) ([]*common.Block, error) {
 	var blocks []*common.Block
 	err := meddler.QueryAll(
 		hdb.db, &blocks,
@@ -122,14 +122,14 @@ func (hdb *HistoryDB) GetLastL1TxsNum() (uint32, error) {
 }
 
 // Reorg deletes all the information that was added into the DB after the lastValidBlock
-func (hdb *HistoryDB) Reorg(lastValidBlock uint64) error {
+func (hdb *HistoryDB) Reorg(lastValidBlock int64) error {
 	_, err := hdb.db.Exec("DELETE FROM block WHERE eth_block_num > $1;", lastValidBlock)
 	return err
 }
 
 // SyncRollup stores all the data that can be changed / added on a block in the Rollup SC
 func (hdb *HistoryDB) SyncRollup(
-	blockNum uint64,
+	blockNum int64,
 	l1txs []common.L1Tx,
 	l2txs []common.L2Tx,
 	registeredAccounts []common.Account,
@@ -148,7 +148,7 @@ func (hdb *HistoryDB) SyncRollup(
 
 // SyncPoD stores all the data that can be changed / added on a block in the PoD SC
 func (hdb *HistoryDB) SyncPoD(
-	blockNum uint64,
+	blockNum int64,
 	bids []common.Bid,
 	coordinators []common.Coordinator,
 	vars *common.AuctionVars,

db/historydb/historydb_test.go

@@ -41,7 +41,7 @@ func TestMain(m *testing.M) {
 }
 
 func TestBlocks(t *testing.T) {
-	var fromBlock, toBlock uint64
+	var fromBlock, toBlock int64
 	fromBlock = 1
 	toBlock = 5
 	// Delete peviously created rows (clean previous test execs)
@@ -80,8 +80,8 @@ func assertEqualBlock(t *testing.T, expected *common.Block, actual *common.Block
 }
 
 func TestBatches(t *testing.T) {
-	const fromBlock uint64 = 1
-	const toBlock uint64 = 3
+	const fromBlock int64 = 1
+	const toBlock int64 = 3
 	const nBatchesPerBlock = 3
 	// Prepare blocks in the DB
 	setTestBlocks(fromBlock, toBlock)
@@ -95,7 +95,7 @@ func TestBatches(t *testing.T) {
 		for j := 0; j < nBatchesPerBlock; j++ {
 			batch := common.Batch{
 				BatchNum:      common.BatchNum(int(i-1)*nBatchesPerBlock + j),
-				EthBlockNum:   uint64(i),
+				EthBlockNum:   int64(i),
 				ForgerAddr:    eth.BigToAddress(big.NewInt(239457111187)),
 				CollectedFees: collectedFees,
 				StateRoot:     common.Hash([]byte("duhdqlwiucgwqeiu")),
@@ -129,8 +129,8 @@ func TestBatches(t *testing.T) {
 }
 
 func TestBids(t *testing.T) {
-	const fromBlock uint64 = 1
-	const toBlock uint64 = 5
+	const fromBlock int64 = 1
+	const toBlock int64 = 5
 	const bidsPerSlot = 5
 	// Prepare blocks in the DB
 	setTestBlocks(fromBlock, toBlock)
@@ -162,7 +162,7 @@ func TestBids(t *testing.T) {
 }
 
 // setTestBlocks WARNING: this will delete the blocks and recreate them
-func setTestBlocks(from, to uint64) {
+func setTestBlocks(from, to int64) {
 	if from == 0 {
 		if err := historyDB.Reorg(from); err != nil {
 			panic(err)
@@ -178,7 +178,7 @@ func setTestBlocks(from, to uint64) {
 	}
 }
 
-func genBlocks(from, to uint64) []common.Block {
+func genBlocks(from, to int64) []common.Block {
 	var blocks []common.Block
 	for i := from; i < to; i++ {
 		blocks = append(blocks, common.Block{