diff --git a/api/swagger.yml b/api/swagger.yml
index 23ec8f5..6cbde7c 100644
--- a/api/swagger.yml
+++ b/api/swagger.yml
@@ -1492,6 +1492,7 @@ components:
       type: string
       description: BigInt is an integer encoded as a string for numbers that are very large.
       example: "8708856933496328593"
+      pattern: "^[0-9]$"
     FeeSelector:
       type: integer
       description: Index of the fee type to select, more info [here](https://idocs.hermez.io/#/spec/zkrollup/fee-table?id=transaction-fee-table).
diff --git a/apitypes/apitypes.go b/apitypes/apitypes.go
new file mode 100644
index 0000000..d64bf82
--- /dev/null
+++ b/apitypes/apitypes.go
@@ -0,0 +1,207 @@
+package apitypes
+
+import (
+	"database/sql/driver"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"math/big"
+	"strings"
+
+	ethCommon "github.com/ethereum/go-ethereum/common"
+	"github.com/hermeznetwork/hermez-node/common"
+	"github.com/iden3/go-iden3-crypto/babyjub"
+)
+
+// BigIntStr is used to scan/value *big.Int directly into strings from/to sql DBs.
+// It assumes that *big.Int are inserted/fetched to/from the DB using the BigIntMeddler meddler
+// defined at github.com/hermeznetwork/hermez-node/db
+type BigIntStr string
+
+// NewBigIntStr creates a *BigIntStr from a *big.Int.
+// If the provided bigInt is nil the returned *BigIntStr will also be nil
+func NewBigIntStr(bigInt *big.Int) *BigIntStr {
+	if bigInt == nil {
+		return nil
+	}
+	bigIntStr := BigIntStr(bigInt.String())
+	return &bigIntStr
+}
+
+// Scan implements Scanner for database/sql
+func (b *BigIntStr) Scan(src interface{}) error {
+	// decode base64 src
+	var decoded []byte
+	var err error
+	if srcStr, ok := src.(string); ok {
+		// src is a string
+		decoded, err = base64.StdEncoding.DecodeString(srcStr)
+	} else if srcBytes, ok := src.([]byte); ok {
+		// src is []byte
+		decoded, err = base64.StdEncoding.DecodeString(string(srcBytes))
+	} else {
+		// unexpected src
+		return fmt.Errorf("can't scan %T into apitypes.BigIntStr", src)
+	}
+	if err != nil {
+		return err
+	}
+	// decoded bytes to *big.Int
+	bigInt := &big.Int{}
+	bigInt = bigInt.SetBytes(decoded)
+	// *big.Int to BigIntStr
+	bigIntStr := NewBigIntStr(bigInt)
+	if bigIntStr == nil {
+		return nil
+	}
+	*b = *bigIntStr
+	return nil
+}
+
+// Value implements valuer for database/sql
+func (b BigIntStr) Value() (driver.Value, error) {
+	// string to *big.Int
+	bigInt := &big.Int{}
+	bigInt, ok := bigInt.SetString(string(b), 10)
+	if !ok || bigInt == nil {
+		return nil, errors.New("invalid representation of a *big.Int")
+	}
+	// *big.Int to base64
+	return base64.StdEncoding.EncodeToString(bigInt.Bytes()), nil
+}
+
+type CollectedFees map[common.TokenID]BigIntStr
+
+func (c *CollectedFees) UnmarshalJSON(text []byte) error {
+	fmt.Println(string(text))
+	bigIntMap := make(map[common.TokenID]*big.Int)
+	if err := json.Unmarshal(text, &bigIntMap); err != nil {
+		return err
+	}
+	bStrMap := make(map[common.TokenID]BigIntStr)
+	for k, v := range bigIntMap {
+		bStr := NewBigIntStr(v)
+		bStrMap[k] = *bStr
+	}
+	*c = CollectedFees(bStrMap)
+	return nil
+	// fmt.Println(string(text))
+	// *b = BigIntStr(string(text))
+	// return nil
+	// bigInt := &big.Int{}
+	// if err := bigInt.UnmarshalText(text); err != nil {
+	// 	return err
+	// }
+	// bigIntStr := NewBigIntStr(bigInt)
+	// if bigIntStr == nil {
+	// 	return nil
+	// }
+	// *b = *bigIntStr
+	// return nil
+}
+
+// HezEthAddr is used to scan/value Ethereum Address directly into strings that follow the Ethereum address hez fotmat (^hez:0x[a-fA-F0-9]{40}$) from/to sql DBs.
+// It assumes that Ethereum Address are inserted/fetched to/from the DB using the default Scan/Value interface
+type HezEthAddr string
+
+// NewHezEthAddr creates a HezEthAddr from an Ethereum addr
+func NewHezEthAddr(addr ethCommon.Address) HezEthAddr {
+	return HezEthAddr("hez:" + addr.String())
+}
+
+// ToEthAddr returns an Ethereum Address created from HezEthAddr
+func (a HezEthAddr) ToEthAddr() (ethCommon.Address, error) {
+	addrStr := strings.TrimPrefix(string(a), "hez:")
+	var addr ethCommon.Address
+	return addr, addr.UnmarshalText([]byte(addrStr))
+}
+
+// Scan implements Scanner for database/sql
+func (a *HezEthAddr) Scan(src interface{}) error {
+	ethAddr := &ethCommon.Address{}
+	if err := ethAddr.Scan(src); err != nil {
+		return err
+	}
+	if ethAddr == nil {
+		return nil
+	}
+	*a = NewHezEthAddr(*ethAddr)
+	return nil
+}
+
+// Value implements valuer for database/sql
+func (a HezEthAddr) Value() (driver.Value, error) {
+	ethAddr, err := a.ToEthAddr()
+	if err != nil {
+		return nil, err
+	}
+	return ethAddr.Value()
+}
+
+// HezBJJ is used to scan/value *babyjub.PublicKey directly into strings that follow the BJJ public key hez fotmat (^hez:[A-Za-z0-9_-]{44}$) from/to sql DBs.
+// It assumes that *babyjub.PublicKey are inserted/fetched to/from the DB using the default Scan/Value interface
+type HezBJJ string
+
+// NewHezBJJ creates a HezBJJ from a *babyjub.PublicKey.
+// Calling this method with a nil bjj causes panic
+func NewHezBJJ(bjj *babyjub.PublicKey) HezBJJ {
+	pkComp := [32]byte(bjj.Compress())
+	sum := pkComp[0]
+	for i := 1; i < len(pkComp); i++ {
+		sum += pkComp[i]
+	}
+	bjjSum := append(pkComp[:], sum)
+	return HezBJJ("hez:" + base64.RawURLEncoding.EncodeToString(bjjSum))
+}
+
+// ToBJJ returns a *babyjub.PublicKey created from HezBJJ
+func (b HezBJJ) ToBJJ() (*babyjub.PublicKey, error) {
+	const decodedLen = 33
+	const encodedLen = 44
+	formatErr := errors.New("invalid BJJ format. Must follow this regex: ^hez:[A-Za-z0-9_-]{44}$")
+	encoded := strings.TrimPrefix(string(b), "hez:")
+	if len(encoded) != encodedLen {
+		return nil, formatErr
+	}
+	decoded, err := base64.RawURLEncoding.DecodeString(encoded)
+	if err != nil {
+		return nil, formatErr
+	}
+	if len(decoded) != decodedLen {
+		return nil, formatErr
+	}
+	bjjBytes := [decodedLen - 1]byte{}
+	copy(bjjBytes[:decodedLen-1], decoded[:decodedLen-1])
+	sum := bjjBytes[0]
+	for i := 1; i < len(bjjBytes); i++ {
+		sum += bjjBytes[i]
+	}
+	if decoded[decodedLen-1] != sum {
+		return nil, errors.New("checksum verification failed")
+	}
+	bjjComp := babyjub.PublicKeyComp(bjjBytes)
+	return bjjComp.Decompress()
+}
+
+// Scan implements Scanner for database/sql
+func (b *HezBJJ) Scan(src interface{}) error {
+	bjj := &babyjub.PublicKey{}
+	if err := bjj.Scan(src); err != nil {
+		return err
+	}
+	if bjj == nil {
+		return nil
+	}
+	*b = NewHezBJJ(bjj)
+	return nil
+}
+
+// Value implements valuer for database/sql
+func (b HezBJJ) Value() (driver.Value, error) {
+	bjj, err := b.ToBJJ()
+	if err != nil {
+		return nil, err
+	}
+	return bjj.Value()
+}
diff --git a/apitypes/apitypes_test.go b/apitypes/apitypes_test.go
new file mode 100644
index 0000000..1614111
--- /dev/null
+++ b/apitypes/apitypes_test.go
@@ -0,0 +1,286 @@
+package apitypes
+
+import (
+	"database/sql"
+	"io/ioutil"
+	"math/big"
+	"os"
+	"testing"
+
+	"github.com/iden3/go-iden3-crypto/babyjub"
+
+	ethCommon "github.com/ethereum/go-ethereum/common"
+	dbUtils "github.com/hermeznetwork/hermez-node/db"
+	_ "github.com/mattn/go-sqlite3" // sqlite driver
+	"github.com/russross/meddler"
+	"github.com/stretchr/testify/assert"
+)
+
+var db *sql.DB
+
+func TestMain(m *testing.M) {
+	// Register meddler
+	meddler.Default = meddler.SQLite
+	meddler.Register("bigint", dbUtils.BigIntMeddler{})
+	meddler.Register("bigintnull", dbUtils.BigIntNullMeddler{})
+	// Create temporary sqlite DB
+	dir, err := ioutil.TempDir("", "db")
+	if err != nil {
+		panic(err)
+	}
+	db, err = sql.Open("sqlite3", dir+"sqlite.db")
+	defer os.RemoveAll(dir)
+	if err != nil {
+		panic(err)
+	}
+	schema := `CREATE TABLE test (i BLOB);`
+	if _, err := db.Exec(schema); err != nil {
+		panic(err)
+	}
+	// Run tests
+	result := m.Run()
+	os.Exit(result)
+}
+
+func TestBigIntStrScannerValuer(t *testing.T) {
+	// Clean DB
+	_, err := db.Exec("delete from test")
+	assert.NoError(t, err)
+	// Example structs
+	type bigInMeddlerStruct struct {
+		I *big.Int `meddler:"i,bigint"` // note the bigint that instructs meddler to use BigIntMeddler
+	}
+	type bigIntStrStruct struct {
+		I BigIntStr `meddler:"i"` // note that no meddler is specified, and Scan/Value will be used
+	}
+	type bigInMeddlerStructNil struct {
+		I *big.Int `meddler:"i,bigintnull"` // note the bigint that instructs meddler to use BigIntNullMeddler
+	}
+	type bigIntStrStructNil struct {
+		I *BigIntStr `meddler:"i"` // note that no meddler is specified, and Scan/Value will be used
+	}
+
+	// Not nil case
+	// Insert into DB using meddler
+	const x = int64(12345)
+	fromMeddler := bigInMeddlerStruct{
+		I: big.NewInt(x),
+	}
+	err = meddler.Insert(db, "test", &fromMeddler)
+	assert.NoError(t, err)
+	// Read from DB using BigIntStr
+	toBigIntStr := bigIntStrStruct{}
+	err = meddler.QueryRow(db, &toBigIntStr, "select * from test")
+	assert.NoError(t, err)
+	assert.Equal(t, fromMeddler.I.String(), string(toBigIntStr.I))
+	// Clean DB
+	_, err = db.Exec("delete from test")
+	assert.NoError(t, err)
+	// Insert into DB using BigIntStr
+	fromBigIntStr := bigIntStrStruct{
+		I: "54321",
+	}
+	err = meddler.Insert(db, "test", &fromBigIntStr)
+	assert.NoError(t, err)
+	// Read from DB using meddler
+	toMeddler := bigInMeddlerStruct{}
+	err = meddler.QueryRow(db, &toMeddler, "select * from test")
+	assert.NoError(t, err)
+	assert.Equal(t, string(fromBigIntStr.I), toMeddler.I.String())
+
+	// Nil case
+	// Clean DB
+	_, err = db.Exec("delete from test")
+	assert.NoError(t, err)
+	// Insert into DB using meddler
+	fromMeddlerNil := bigInMeddlerStructNil{
+		I: nil,
+	}
+	err = meddler.Insert(db, "test", &fromMeddlerNil)
+	assert.NoError(t, err)
+	// Read from DB using BigIntStr
+	foo := BigIntStr("foo")
+	toBigIntStrNil := bigIntStrStructNil{
+		I: &foo, // check that this will be set to nil, not because of not being initialized
+	}
+	err = meddler.QueryRow(db, &toBigIntStrNil, "select * from test")
+	assert.NoError(t, err)
+	assert.Nil(t, toBigIntStrNil.I)
+	// Clean DB
+	_, err = db.Exec("delete from test")
+	assert.NoError(t, err)
+	// Insert into DB using BigIntStr
+	fromBigIntStrNil := bigIntStrStructNil{
+		I: nil,
+	}
+	err = meddler.Insert(db, "test", &fromBigIntStrNil)
+	assert.NoError(t, err)
+	// Read from DB using meddler
+	toMeddlerNil := bigInMeddlerStructNil{
+		I: big.NewInt(x), // check that this will be set to nil, not because of not being initialized
+	}
+	err = meddler.QueryRow(db, &toMeddlerNil, "select * from test")
+	assert.NoError(t, err)
+	assert.Nil(t, toMeddlerNil.I)
+}
+
+func TestHezEthAddr(t *testing.T) {
+	// Clean DB
+	_, err := db.Exec("delete from test")
+	assert.NoError(t, err)
+	// Example structs
+	type ethAddrStruct struct {
+		I ethCommon.Address `meddler:"i"`
+	}
+	type hezEthAddrStruct struct {
+		I HezEthAddr `meddler:"i"`
+	}
+	type ethAddrStructNil struct {
+		I *ethCommon.Address `meddler:"i"`
+	}
+	type hezEthAddrStructNil struct {
+		I *HezEthAddr `meddler:"i"`
+	}
+
+	// Not nil case
+	// Insert into DB using ethCommon.Address Scan/Value
+	fromEth := ethAddrStruct{
+		I: ethCommon.BigToAddress(big.NewInt(73737373)),
+	}
+	err = meddler.Insert(db, "test", &fromEth)
+	assert.NoError(t, err)
+	// Read from DB using HezEthAddr Scan/Value
+	toHezEth := hezEthAddrStruct{}
+	err = meddler.QueryRow(db, &toHezEth, "select * from test")
+	assert.NoError(t, err)
+	assert.Equal(t, NewHezEthAddr(fromEth.I), toHezEth.I)
+	// Clean DB
+	_, err = db.Exec("delete from test")
+	assert.NoError(t, err)
+	// Insert into DB using HezEthAddr Scan/Value
+	fromHezEth := hezEthAddrStruct{
+		I: NewHezEthAddr(ethCommon.BigToAddress(big.NewInt(3786872586))),
+	}
+	err = meddler.Insert(db, "test", &fromHezEth)
+	assert.NoError(t, err)
+	// Read from DB using ethCommon.Address Scan/Value
+	toEth := ethAddrStruct{}
+	err = meddler.QueryRow(db, &toEth, "select * from test")
+	assert.NoError(t, err)
+	assert.Equal(t, fromHezEth.I, NewHezEthAddr(toEth.I))
+
+	// Nil case
+	// Clean DB
+	_, err = db.Exec("delete from test")
+	assert.NoError(t, err)
+	// Insert into DB using ethCommon.Address Scan/Value
+	fromEthNil := ethAddrStructNil{
+		I: nil,
+	}
+	err = meddler.Insert(db, "test", &fromEthNil)
+	assert.NoError(t, err)
+	// Read from DB using HezEthAddr Scan/Value
+	foo := HezEthAddr("foo")
+	toHezEthNil := hezEthAddrStructNil{
+		I: &foo, // check that this will be set to nil, not because of not being initialized
+	}
+	err = meddler.QueryRow(db, &toHezEthNil, "select * from test")
+	assert.NoError(t, err)
+	assert.Nil(t, toHezEthNil.I)
+	// Clean DB
+	_, err = db.Exec("delete from test")
+	assert.NoError(t, err)
+	// Insert into DB using HezEthAddr Scan/Value
+	fromHezEthNil := hezEthAddrStructNil{
+		I: nil,
+	}
+	err = meddler.Insert(db, "test", &fromHezEthNil)
+	assert.NoError(t, err)
+	// Read from DB using ethCommon.Address Scan/Value
+	fooAddr := ethCommon.BigToAddress(big.NewInt(1))
+	toEthNil := ethAddrStructNil{
+		I: &fooAddr, // check that this will be set to nil, not because of not being initialized
+	}
+	err = meddler.QueryRow(db, &toEthNil, "select * from test")
+	assert.NoError(t, err)
+	assert.Nil(t, toEthNil.I)
+}
+
+func TestHezBJJ(t *testing.T) {
+	// Clean DB
+	_, err := db.Exec("delete from test")
+	assert.NoError(t, err)
+	// Example structs
+	type bjjStruct struct {
+		I *babyjub.PublicKey `meddler:"i"`
+	}
+	type hezBJJStruct struct {
+		I HezBJJ `meddler:"i"`
+	}
+	type hezBJJStructNil struct {
+		I *HezBJJ `meddler:"i"`
+	}
+
+	// Not nil case
+	// Insert into DB using *babyjub.PublicKey Scan/Value
+	priv := babyjub.NewRandPrivKey()
+	fromBJJ := bjjStruct{
+		I: priv.Public(),
+	}
+	err = meddler.Insert(db, "test", &fromBJJ)
+	assert.NoError(t, err)
+	// Read from DB using HezBJJ Scan/Value
+	toHezBJJ := hezBJJStruct{}
+	err = meddler.QueryRow(db, &toHezBJJ, "select * from test")
+	assert.NoError(t, err)
+	assert.Equal(t, NewHezBJJ(fromBJJ.I), toHezBJJ.I)
+	// Clean DB
+	_, err = db.Exec("delete from test")
+	assert.NoError(t, err)
+	// Insert into DB using HezBJJ Scan/Value
+	fromHezBJJ := hezBJJStruct{
+		I: NewHezBJJ(priv.Public()),
+	}
+	err = meddler.Insert(db, "test", &fromHezBJJ)
+	assert.NoError(t, err)
+	// Read from DB using *babyjub.PublicKey Scan/Value
+	toBJJ := bjjStruct{}
+	err = meddler.QueryRow(db, &toBJJ, "select * from test")
+	assert.NoError(t, err)
+	assert.Equal(t, fromHezBJJ.I, NewHezBJJ(toBJJ.I))
+
+	// Nil case
+	// Clean DB
+	_, err = db.Exec("delete from test")
+	assert.NoError(t, err)
+	// Insert into DB using *babyjub.PublicKey Scan/Value
+	fromBJJNil := bjjStruct{
+		I: nil,
+	}
+	err = meddler.Insert(db, "test", &fromBJJNil)
+	assert.NoError(t, err)
+	// Read from DB using HezBJJ Scan/Value
+	foo := HezBJJ("foo")
+	toHezBJJNil := hezBJJStructNil{
+		I: &foo, // check that this will be set to nil, not because of not being initialized
+	}
+	err = meddler.QueryRow(db, &toHezBJJNil, "select * from test")
+	assert.NoError(t, err)
+	assert.Nil(t, toHezBJJNil.I)
+	// Clean DB
+	_, err = db.Exec("delete from test")
+	assert.NoError(t, err)
+	// Insert into DB using HezBJJ Scan/Value
+	fromHezBJJNil := hezBJJStructNil{
+		I: nil,
+	}
+	err = meddler.Insert(db, "test", &fromHezBJJNil)
+	assert.NoError(t, err)
+	// Read from DB using *babyjub.PublicKey Scan/Value
+	toBJJNil := bjjStruct{
+		I: priv.Public(), // check that this will be set to nil, not because of not being initialized
+	}
+	err = meddler.QueryRow(db, &toBJJNil, "select * from test")
+	assert.NoError(t, err)
+	assert.Nil(t, toBJJNil.I)
+}
diff --git a/common/batch.go b/common/batch.go
index d132442..1d7206f 100644
--- a/common/batch.go
+++ b/common/batch.go
@@ -14,7 +14,7 @@ const batchNumBytesLen = 8
 type Batch struct {
 	BatchNum      BatchNum             `meddler:"batch_num"`
 	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?
+	ForgerAddr    ethCommon.Address    `meddler:"forger_addr"`
 	CollectedFees map[TokenID]*big.Int `meddler:"fees_collected,json"`
 	StateRoot     *big.Int             `meddler:"state_root,bigint"`
 	NumAccounts   int                  `meddler:"num_accounts"`
diff --git a/db/historydb/historydb.go b/db/historydb/historydb.go
index 7421d02..ae3e831 100644
--- a/db/historydb/historydb.go
+++ b/db/historydb/historydb.go
@@ -150,6 +150,15 @@ func (hdb *HistoryDB) addBatches(d meddler.DB, batches []common.Batch) error {
 	return nil
 }
 
+// GetBatch return the batch with the given batchNum
+func (hdb *HistoryDB) GetBatch(batchNum common.BatchNum) (HistoryBatch, error) {
+	var batch *common.Batch
+	return batch, meddler.QueryRow(
+		hdb.db, &batch,
+		"SELECT * FROM batch WHERE batch_num == $1;", batchNum,
+	)
+}
+
 // GetBatches retrieve batches from the DB, given a range of batch numbers defined by from and to
 func (hdb *HistoryDB) GetBatches(from, to common.BatchNum) ([]common.Batch, error) {
 	var batches []*common.Batch
diff --git a/db/historydb/views.go b/db/historydb/views.go
index cdff84c..e29a011 100644
--- a/db/historydb/views.go
+++ b/db/historydb/views.go
@@ -6,6 +6,7 @@ import (
 
 	ethCommon "github.com/ethereum/go-ethereum/common"
 	"github.com/hermeznetwork/hermez-node/common"
+	"github.com/hermeznetwork/hermez-node/db"
 	"github.com/iden3/go-iden3-crypto/babyjub"
 	"github.com/iden3/go-merkletree"
 )
@@ -131,3 +132,24 @@ type HistoryCoordinator struct {
 	FirstItem   int               `meddler:"first_item"`
 	LastItem    int               `meddler:"last_item"`
 }
+
+// HistoryBatch is a representation of a batch with additional information
+// required by the API, and extracted by joining block table
+type HistoryBatch struct {
+	ItemID        int                             `json:"itemId" meddler:"item_id"`
+	BatchNum      common.BatchNum                 `json:"batchNum" meddler:"batch_num"`
+	EthBlockNum   int64                           `json:"ethereumBlockNum" meddler:"eth_block_num"`
+	EthBlockHash  ethCommon.Hash                  `json:"ethereumBlockHash" meddler:"hash"`
+	Timestamp     time.Time                       `json:"timestamp" meddler:"timestamp,utctime"`
+	ForgerAddr    ethCommon.Address               `json:"forgerAddr" meddler:"forger_addr"`
+	CollectedFees map[common.TokenID]db.BigIntStr `json:"collectedFees" meddler:"fees_collected,json"`
+	TotalFeesUSD  float64                         `json:"historicTotalCollectedFeesUSD" meddler:"total_fees_usd"`
+	StateRoot     db.BigIntStr                    `json:"stateRoot" meddler:"state_root"`
+	NumAccounts   int                             `json:"numAccounts" meddler:"num_accounts"`
+	ExitRoot      db.BigIntStr                    `json:"exitRoot" meddler:"exit_root"`
+	ForgeL1TxsNum *int64                          `json:"forgeL1TransactionsNum" meddler:"forge_l1_txs_num"`
+	SlotNum       int64                           `json:"slotNum" meddler:"slot_num"`
+	TotalItems    int                             `json:"-" meddler:"total_items"`
+	FirstItem     int                             `json:"-" meddler:"first_item"`
+	LastItem      int                             `json:"-" meddler:"last_item"`
+}
diff --git a/db/migrations/0001.sql b/db/migrations/0001.sql
index 8083d64..05eca3e 100644
--- a/db/migrations/0001.sql
+++ b/db/migrations/0001.sql
@@ -16,7 +16,8 @@ CREATE TABLE coordinator (
 );
 
 CREATE TABLE batch (
-    batch_num BIGINT PRIMARY KEY,
+    item_id SERIAL PRIMARY KEY,
+    batch_num BIGINT NOT NULL,
     eth_block_num BIGINT NOT NULL REFERENCES block (eth_block_num) ON DELETE CASCADE,
     forger_addr BYTEA NOT NULL, -- fake foreign key for coordinator
     fees_collected BYTEA NOT NULL,
diff --git a/db/utils.go b/db/utils.go
index cb96172..3cb52a0 100644
--- a/db/utils.go
+++ b/db/utils.go
@@ -192,3 +192,11 @@ type Paginationer interface {
 	GetPagination() *Pagination
 	Len() int
 }
+
+// BigIntStr is used to Marshal *big.Int directly into strings
+type BigIntStr big.Int
+
+func (b BigIntStr) MarshalText() ([]byte, error) {
+	bigInt := big.Int(b)
+	return []byte((&bigInt).String()), nil
+}
diff --git a/go.mod b/go.mod
index e111650..2a53e25 100644
--- a/go.mod
+++ b/go.mod
@@ -4,6 +4,7 @@ go 1.14
 
 require (
 	github.com/BurntSushi/toml v0.3.1
+	github.com/aristanetworks/goarista v0.0.0-20190712234253-ed1100a1c015
 	github.com/dghubble/sling v1.3.0
 	github.com/ethereum/go-ethereum v1.9.17
 	github.com/getkin/kin-openapi v0.22.0
@@ -16,6 +17,7 @@ require (
 	github.com/jinzhu/copier v0.0.0-20190924061706-b57f9002281a
 	github.com/jmoiron/sqlx v1.2.0
 	github.com/lib/pq v1.8.0
+	github.com/mattn/go-sqlite3 v2.0.3+incompatible
 	github.com/mitchellh/copystructure v1.0.0
 	github.com/rogpeppe/go-internal v1.6.1 // indirect
 	github.com/rubenv/sql-migrate v0.0.0-20200616145509-8d140a17f351