diff --git a/packages/relayer/api/api.go b/packages/relayer/api/api.go
index ab7b3c1b0e8..ebff088719b 100644
--- a/packages/relayer/api/api.go
+++ b/packages/relayer/api/api.go
@@ -2,7 +2,6 @@ package api
 
 import (
 	"context"
-	"database/sql"
 	"fmt"
 	"log/slog"
 	nethttp "net/http"
@@ -17,14 +16,8 @@ import (
 	"github.com/taikoxyz/taiko-mono/packages/relayer/pkg/repo"
 	"github.com/taikoxyz/taiko-mono/packages/relayer/pkg/utils"
 	"github.com/urfave/cli/v2"
-	"gorm.io/gorm"
 )
 
-type DB interface {
-	DB() (*sql.DB, error)
-	GormDB() *gorm.DB
-}
-
 type API struct {
 	srv          *http.Server
 	httpPort     uint64
diff --git a/packages/relayer/api/config.go b/packages/relayer/api/config.go
index 9c25d25e5a5..22b320cecc3 100644
--- a/packages/relayer/api/config.go
+++ b/packages/relayer/api/config.go
@@ -28,7 +28,7 @@ type Config struct {
 	ProcessingFeeMultiplier float64
 	DestTaikoAddress        common.Address
 	HTTPPort                uint64
-	OpenDBFunc              func() (DB, error)
+	OpenDBFunc              func() (db.DB, error)
 }
 
 // NewConfigFromCliContext creates a new config instance from command line flags.
@@ -47,7 +47,7 @@ func NewConfigFromCliContext(c *cli.Context) (*Config, error) {
 		DestRPCUrl:              c.String(flags.DestRPCUrl.Name),
 		ProcessingFeeMultiplier: c.Float64(flags.ProcessingFeeMultiplier.Name),
 		DestTaikoAddress:        common.HexToAddress(c.String(flags.DestTaikoAddress.Name)),
-		OpenDBFunc: func() (DB, error) {
+		OpenDBFunc: func() (db.DB, error) {
 			return db.OpenDBConnection(db.DBConnectionOpts{
 				Name:            c.String(flags.DatabaseUsername.Name),
 				Password:        c.String(flags.DatabasePassword.Name),
@@ -56,7 +56,7 @@ func NewConfigFromCliContext(c *cli.Context) (*Config, error) {
 				MaxIdleConns:    c.Uint64(flags.DatabaseMaxIdleConns.Name),
 				MaxOpenConns:    c.Uint64(flags.DatabaseMaxOpenConns.Name),
 				MaxConnLifetime: c.Uint64(flags.DatabaseConnMaxLifetime.Name),
-				OpenFunc: func(dsn string) (*db.DB, error) {
+				OpenFunc: func(dsn string) (db.DB, error) {
 					gormDB, err := gorm.Open(mysql.Open(dsn), &gorm.Config{
 						Logger: logger.Default.LogMode(logger.Silent),
 					})
diff --git a/packages/relayer/api/config_test.go b/packages/relayer/api/config_test.go
index 0e07a99668d..9176b3a8856 100644
--- a/packages/relayer/api/config_test.go
+++ b/packages/relayer/api/config_test.go
@@ -4,9 +4,11 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/urfave/cli/v2"
+
 	"github.com/taikoxyz/taiko-mono/packages/relayer/cmd/flags"
+	"github.com/taikoxyz/taiko-mono/packages/relayer/pkg/db"
 	"github.com/taikoxyz/taiko-mono/packages/relayer/pkg/mock"
-	"github.com/urfave/cli/v2"
 )
 
 var (
@@ -47,7 +49,7 @@ func TestNewConfigFromCliContext(t *testing.T) {
 		assert.Equal(t, "destRpcUrl", c.DestRPCUrl)
 		assert.Equal(t, destTaikoAddress, c.DestTaikoAddress.Hex())
 
-		c.OpenDBFunc = func() (DB, error) {
+		c.OpenDBFunc = func() (db.DB, error) {
 			return &mock.DB{}, nil
 		}
 
diff --git a/packages/relayer/indexer/config.go b/packages/relayer/indexer/config.go
index a765fda5b0c..3b8a6ac4704 100644
--- a/packages/relayer/indexer/config.go
+++ b/packages/relayer/indexer/config.go
@@ -103,7 +103,7 @@ func NewConfigFromCliContext(c *cli.Context) (*Config, error) {
 				MaxIdleConns:    c.Uint64(flags.DatabaseMaxIdleConns.Name),
 				MaxOpenConns:    c.Uint64(flags.DatabaseMaxOpenConns.Name),
 				MaxConnLifetime: c.Uint64(flags.DatabaseConnMaxLifetime.Name),
-				OpenFunc: func(dsn string) (*db.DB, error) {
+				OpenFunc: func(dsn string) (db.DB, error) {
 					gormDB, err := gorm.Open(mysql.Open(dsn), &gorm.Config{
 						Logger: logger.Default.LogMode(logger.Silent),
 					})
diff --git a/packages/relayer/pkg/db/db.go b/packages/relayer/pkg/db/db.go
index e2d19c61ca0..f8887021584 100644
--- a/packages/relayer/pkg/db/db.go
+++ b/packages/relayer/pkg/db/db.go
@@ -1,36 +1,41 @@
 package db
 
 import (
-	"database/sql"
 	"fmt"
 	"time"
 
+	"database/sql"
 	"github.com/cyberhorsey/errors"
 	"gorm.io/gorm"
 )
 
-type DB struct {
+var (
+	ErrNoDB = errors.Validation.NewWithKeyAndDetail("ERR_NO_DB", "no db")
+)
+
+type DB interface {
+	DB() (*sql.DB, error)
+	GormDB() *gorm.DB
+}
+
+type Database struct {
 	gormdb *gorm.DB
 }
 
-func (db *DB) DB() (*sql.DB, error) {
+func (db *Database) DB() (*sql.DB, error) {
 	return db.gormdb.DB()
 }
 
-func (db *DB) GormDB() *gorm.DB {
+func (db *Database) GormDB() *gorm.DB {
 	return db.gormdb
 }
 
-func New(gormdb *gorm.DB) *DB {
-	return &DB{
+func New(gormdb *gorm.DB) DB {
+	return &Database{
 		gormdb: gormdb,
 	}
 }
 
-var (
-	ErrNoDB = errors.Validation.NewWithKeyAndDetail("ERR_NO_DB", "DB is required")
-)
-
 type DBConnectionOpts struct {
 	Name            string
 	Password        string
@@ -39,10 +44,10 @@ type DBConnectionOpts struct {
 	MaxIdleConns    uint64
 	MaxOpenConns    uint64
 	MaxConnLifetime uint64
-	OpenFunc        func(dsn string) (*DB, error)
+	OpenFunc        func(dsn string) (DB, error)
 }
 
-func OpenDBConnection(opts DBConnectionOpts) (*DB, error) {
+func OpenDBConnection(opts DBConnectionOpts) (DB, error) {
 	dsn := ""
 	if opts.Password == "" {
 		dsn = fmt.Sprintf(
diff --git a/packages/relayer/pkg/repo/containers_test.go b/packages/relayer/pkg/repo/containers_test.go
index 67f186da3bc..c18e06f4c72 100644
--- a/packages/relayer/pkg/repo/containers_test.go
+++ b/packages/relayer/pkg/repo/containers_test.go
@@ -6,12 +6,13 @@ import (
 	"testing"
 
 	"github.com/pressly/goose/v3"
-	"github.com/taikoxyz/taiko-mono/packages/relayer/pkg/db"
 	"github.com/testcontainers/testcontainers-go"
 	"github.com/testcontainers/testcontainers-go/wait"
 	"gorm.io/driver/mysql"
 	"gorm.io/gorm"
 	"gorm.io/gorm/logger"
+
+	"github.com/taikoxyz/taiko-mono/packages/relayer/pkg/db"
 )
 
 var (
@@ -20,7 +21,7 @@ var (
 	dbPassword = "password"
 )
 
-func testMysql(t *testing.T) (DB, func(), error) {
+func testMysql(t *testing.T) (db.DB, func(), error) {
 	req := testcontainers.ContainerRequest{
 		Image:        "mysql:latest",
 		ExposedPorts: []string{"3306/tcp", "33060/tcp"},
diff --git a/packages/relayer/pkg/repo/db.go b/packages/relayer/pkg/repo/db.go
deleted file mode 100644
index 1c8a35dbca3..00000000000
--- a/packages/relayer/pkg/repo/db.go
+++ /dev/null
@@ -1,17 +0,0 @@
-package repo
-
-import (
-	"database/sql"
-
-	"github.com/cyberhorsey/errors"
-	"gorm.io/gorm"
-)
-
-var (
-	ErrNoDB = errors.Validation.NewWithKeyAndDetail("ERR_NO_DB", "no db")
-)
-
-type DB interface {
-	DB() (*sql.DB, error)
-	GormDB() *gorm.DB
-}
diff --git a/packages/relayer/pkg/repo/event.go b/packages/relayer/pkg/repo/event.go
index 6a2b5d47f1a..80d9e149d09 100644
--- a/packages/relayer/pkg/repo/event.go
+++ b/packages/relayer/pkg/repo/event.go
@@ -9,22 +9,24 @@ import (
 
 	"github.com/morkid/paginate"
 	"github.com/pkg/errors"
-	"github.com/taikoxyz/taiko-mono/packages/relayer"
 	"gorm.io/datatypes"
 	"gorm.io/gorm"
+
+	"github.com/taikoxyz/taiko-mono/packages/relayer"
+	"github.com/taikoxyz/taiko-mono/packages/relayer/pkg/db"
 )
 
 type EventRepository struct {
-	db DB
+	db db.DB
 }
 
-func NewEventRepository(db DB) (*EventRepository, error) {
-	if db == nil {
-		return nil, ErrNoDB
+func NewEventRepository(dbHandler db.DB) (*EventRepository, error) {
+	if dbHandler == nil {
+		return nil, db.ErrNoDB
 	}
 
 	return &EventRepository{
-		db: db,
+		db: dbHandler,
 	}, nil
 }
 
diff --git a/packages/relayer/pkg/repo/event_test.go b/packages/relayer/pkg/repo/event_test.go
index f20880a16f6..b363466ef4a 100644
--- a/packages/relayer/pkg/repo/event_test.go
+++ b/packages/relayer/pkg/repo/event_test.go
@@ -10,10 +10,11 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/morkid/paginate"
-	"github.com/taikoxyz/taiko-mono/packages/relayer"
-	"github.com/taikoxyz/taiko-mono/packages/relayer/pkg/db"
 	"gopkg.in/go-playground/assert.v1"
 	"gorm.io/datatypes"
+
+	"github.com/taikoxyz/taiko-mono/packages/relayer"
+	"github.com/taikoxyz/taiko-mono/packages/relayer/pkg/db"
 )
 
 var testMsgHash = "0x1"
@@ -85,18 +86,18 @@ var testEvents = []relayer.Event{
 func Test_NewEventRepo(t *testing.T) {
 	tests := []struct {
 		name    string
-		db      DB
+		db      db.DB
 		wantErr error
 	}{
 		{
 			"success",
-			&db.DB{},
+			&db.Database{},
 			nil,
 		},
 		{
 			"noDb",
 			nil,
-			ErrNoDB,
+			db.ErrNoDB,
 		},
 	}
 
diff --git a/packages/relayer/processor/config.go b/packages/relayer/processor/config.go
index 89d62981d94..cfd86e7ac21 100644
--- a/packages/relayer/processor/config.go
+++ b/packages/relayer/processor/config.go
@@ -187,7 +187,7 @@ func NewConfigFromCliContext(c *cli.Context) (*Config, error) {
 				MaxIdleConns:    c.Uint64(flags.DatabaseMaxIdleConns.Name),
 				MaxOpenConns:    c.Uint64(flags.DatabaseMaxOpenConns.Name),
 				MaxConnLifetime: c.Uint64(flags.DatabaseConnMaxLifetime.Name),
-				OpenFunc: func(dsn string) (*db.DB, error) {
+				OpenFunc: func(dsn string) (db.DB, error) {
 					gormDB, err := gorm.Open(mysql.Open(dsn), &gorm.Config{
 						Logger: logger.Default.LogMode(logger.Silent),
 					})
diff --git a/packages/relayer/watchdog/config.go b/packages/relayer/watchdog/config.go
index cbb91160b3d..0b2a14c041a 100644
--- a/packages/relayer/watchdog/config.go
+++ b/packages/relayer/watchdog/config.go
@@ -103,7 +103,7 @@ func NewConfigFromCliContext(c *cli.Context) (*Config, error) {
 				MaxIdleConns:    c.Uint64(flags.DatabaseMaxIdleConns.Name),
 				MaxOpenConns:    c.Uint64(flags.DatabaseMaxOpenConns.Name),
 				MaxConnLifetime: c.Uint64(flags.DatabaseConnMaxLifetime.Name),
-				OpenFunc: func(dsn string) (*db.DB, error) {
+				OpenFunc: func(dsn string) (db.DB, error) {
 					gormDB, err := gorm.Open(mysql.Open(dsn), &gorm.Config{
 						Logger: logger.Default.LogMode(logger.Silent),
 					})