diff --git a/internal/engine/engine.go b/internal/engine/engine.go
index cba0ac0a..d9fcfde8 100644
--- a/internal/engine/engine.go
+++ b/internal/engine/engine.go
@@ -33,8 +33,8 @@ type Engine interface {
 	UpdateStatus(dag *dag.DAG, status *model.Status) error
 	UpdateDAGSpec(d *dag.DAG, spec string) error
 	DeleteDAG(dag *dag.DAG) error
-	ReadAllStatus(DAGsDir string) (statuses []*DAGStatus, errs []string, err error)
-	ReadStatus(dagLocation string, loadMetadataOnly bool) (*DAGStatus, error)
+	ReadAllStatus(DAGsDir string) (statuses []*persistence.DAGStatus, errs []string, err error)
+	ReadStatus(dagLocation string, loadMetadataOnly bool) (*persistence.DAGStatus, error)
 }
 
 type engineImpl struct {
@@ -44,17 +44,6 @@ type engineImpl struct {
 	workDir          string
 }
 
-// TODO: this should not be here.
-type DAGStatus struct {
-	File      string
-	Dir       string
-	DAG       *dag.DAG
-	Status    *model.Status
-	Suspended bool
-	Error     error
-	ErrorT    *string
-}
-
 var (
 	_DAGTemplate = []byte(`steps:
   - name: step1
@@ -259,8 +248,8 @@ func (e *engineImpl) DeleteDAG(dag *dag.DAG) error {
 }
 
 // ReadAllStatus reads all DAGStatus
-func (e *engineImpl) ReadAllStatus(DAGsDir string) (statuses []*DAGStatus, errs []string, err error) {
-	statuses = []*DAGStatus{}
+func (e *engineImpl) ReadAllStatus(DAGsDir string) (statuses []*persistence.DAGStatus, errs []string, err error) {
+	statuses = []*persistence.DAGStatus{}
 	errs = []string{}
 	if !utils.FileExists(DAGsDir) {
 		if err = os.MkdirAll(DAGsDir, 0755); err != nil {
@@ -285,7 +274,7 @@ func (e *engineImpl) ReadAllStatus(DAGsDir string) (statuses []*DAGStatus, errs
 }
 
 // ReadStatus loads DAG from config file.
-func (e *engineImpl) ReadStatus(dagLocation string, loadMetadataOnly bool) (*DAGStatus, error) {
+func (e *engineImpl) ReadStatus(dagLocation string, loadMetadataOnly bool) (*persistence.DAGStatus, error) {
 	var (
 		cl  = dag.Loader{}
 		d   *dag.DAG
@@ -317,8 +306,8 @@ func (e *engineImpl) ReadStatus(dagLocation string, loadMetadataOnly bool) (*DAG
 	return e.newDAGStatus(d, status, err), err
 }
 
-func (e *engineImpl) newDAGStatus(d *dag.DAG, s *model.Status, err error) *DAGStatus {
-	ret := &DAGStatus{
+func (e *engineImpl) newDAGStatus(d *dag.DAG, s *model.Status, err error) *persistence.DAGStatus {
+	ret := &persistence.DAGStatus{
 		File:      filepath.Base(d.Location),
 		Dir:       filepath.Dir(d.Location),
 		DAG:       d,
diff --git a/internal/persistence/interface.go b/internal/persistence/interface.go
index 5ff0482d..a9b656c5 100644
--- a/internal/persistence/interface.go
+++ b/internal/persistence/interface.go
@@ -46,4 +46,14 @@ type (
 		DAG     *dag.DAG
 		Matches []*grep.Match
 	}
+
+	DAGStatus struct {
+		File      string
+		Dir       string
+		DAG       *dag.DAG
+		Status    *model.Status
+		Suspended bool
+		Error     error
+		ErrorT    *string
+	}
 )
diff --git a/service/frontend/handlers/dag.go b/service/frontend/handlers/dag.go
index 09dbe1fb..5d04401d 100644
--- a/service/frontend/handlers/dag.go
+++ b/service/frontend/handlers/dag.go
@@ -7,6 +7,7 @@ import (
 	"github.com/dagu-dev/dagu/internal/constants"
 	"github.com/dagu-dev/dagu/internal/dag"
 	"github.com/dagu-dev/dagu/internal/engine"
+	"github.com/dagu-dev/dagu/internal/persistence"
 	"github.com/dagu-dev/dagu/internal/persistence/jsondb"
 	domain "github.com/dagu-dev/dagu/internal/persistence/model"
 	"github.com/dagu-dev/dagu/internal/scheduler"
@@ -150,7 +151,7 @@ func (h *DAGHandler) GetList(_ operations.ListDagsParams) (*models.ListDagsRespo
 	}
 
 	// TODO: remove this if it's not needed
-	_, _, hasErr := lo.FindIndexOf(dags, func(d *engine.DAGStatus) bool {
+	_, _, hasErr := lo.FindIndexOf(dags, func(d *persistence.DAGStatus) bool {
 		return d.Error != nil
 	})
 
diff --git a/service/frontend/handlers/response/dag_detail.go b/service/frontend/handlers/response/dag_detail.go
index 7ba80ddd..e01e04d1 100644
--- a/service/frontend/handlers/response/dag_detail.go
+++ b/service/frontend/handlers/response/dag_detail.go
@@ -2,14 +2,14 @@ package response
 
 import (
 	"github.com/dagu-dev/dagu/internal/dag"
-	"github.com/dagu-dev/dagu/internal/engine"
+	"github.com/dagu-dev/dagu/internal/persistence"
 	domain "github.com/dagu-dev/dagu/internal/persistence/model"
 	"github.com/dagu-dev/dagu/service/frontend/models"
 	"github.com/samber/lo"
 )
 
 func ToGetDagDetailResponse(
-	workflowStatus *engine.DAGStatus,
+	workflowStatus *persistence.DAGStatus,
 	tab string,
 ) *models.GetDagDetailsResponse {
 	return &models.GetDagDetailsResponse{
@@ -22,7 +22,7 @@ func ToGetDagDetailResponse(
 	}
 }
 
-func ToDagStatusWithDetails(dagStatus *engine.DAGStatus) *models.DagStatusWithDetails {
+func ToDagStatusWithDetails(dagStatus *persistence.DAGStatus) *models.DagStatusWithDetails {
 	return &models.DagStatusWithDetails{
 		DAG:       ToDagDetail(dagStatus.DAG),
 		Dir:       lo.ToPtr(dagStatus.Dir),
diff --git a/service/frontend/handlers/response/dag_list.go b/service/frontend/handlers/response/dag_list.go
index 7a153f61..6c8aa40e 100644
--- a/service/frontend/handlers/response/dag_list.go
+++ b/service/frontend/handlers/response/dag_list.go
@@ -2,18 +2,18 @@ package response
 
 import (
 	"github.com/dagu-dev/dagu/internal/dag"
-	"github.com/dagu-dev/dagu/internal/engine"
+	"github.com/dagu-dev/dagu/internal/persistence"
 	"github.com/dagu-dev/dagu/service/frontend/models"
 	"github.com/samber/lo"
 )
 
 func ToListDagResponse(
-	dagStatusList []*engine.DAGStatus,
+	dagStatusList []*persistence.DAGStatus,
 	errs []string,
 	hasError bool,
 ) *models.ListDagsResponse {
 	return &models.ListDagsResponse{
-		DAGs: lo.Map(dagStatusList, func(item *engine.DAGStatus, _ int) *models.DagListItem {
+		DAGs: lo.Map(dagStatusList, func(item *persistence.DAGStatus, _ int) *models.DagListItem {
 			return ToDagListItem(item)
 		}),
 		Errors:   errs,
@@ -21,7 +21,7 @@ func ToListDagResponse(
 	}
 }
 
-func ToDagListItem(s *engine.DAGStatus) *models.DagListItem {
+func ToDagListItem(s *persistence.DAGStatus) *models.DagListItem {
 	return &models.DagListItem{
 		Dir:       lo.ToPtr(s.Dir),
 		Error:     lo.ToPtr(toErrorText(s.Error)),