diff --git a/managed/models/database.go b/managed/models/database.go
index f1d59ddde78..953fb72e698 100644
--- a/managed/models/database.go
+++ b/managed/models/database.go
@@ -923,8 +923,8 @@ var databaseSchema = [][]string{
 			id VARCHAR NOT NULL,
 			status VARCHAR NOT NULL CHECK (status <> ''),
 			service_names VARCHAR[],
-			start_time TIMESTAMP NOT NULL,
-			end_time TIMESTAMP NOT NULL,
+			start_time TIMESTAMP,
+			end_time TIMESTAMP,
 			export_qan BOOLEAN NOT NULL,
 			ignore_load BOOLEAN NOT NULL,
 			created_at TIMESTAMP NOT NULL,
diff --git a/managed/models/dump.go b/managed/models/dump.go
index 85515e329c0..d7adcee5c7d 100644
--- a/managed/models/dump.go
+++ b/managed/models/dump.go
@@ -57,8 +57,8 @@ type Dump struct {
 	ID           string         `reform:"id,pk"`
 	Status       DumpStatus     `reform:"status"`
 	ServiceNames pq.StringArray `reform:"service_names"`
-	StartTime    time.Time      `reform:"start_time"`
-	EndTime      time.Time      `reform:"end_time"`
+	StartTime    *time.Time     `reform:"start_time"`
+	EndTime      *time.Time     `reform:"end_time"`
 	ExportQAN    bool           `reform:"export_qan"`
 	IgnoreLoad   bool           `reform:"ignore_load"`
 	CreatedAt    time.Time      `reform:"created_at"`
diff --git a/managed/models/dump_helpers.go b/managed/models/dump_helpers.go
index 990f7518f99..b5c0626ef17 100644
--- a/managed/models/dump_helpers.go
+++ b/managed/models/dump_helpers.go
@@ -52,13 +52,25 @@ type DumpFilters struct {
 
 type CreateDumpParams struct {
 	ServiceNames []string
-	StartTime    time.Time
-	EndTime      time.Time
+	StartTime    *time.Time
+	EndTime      *time.Time
 	ExportQAN    bool
 	IgnoreLoad   bool
 }
 
+func (p *CreateDumpParams) Validate() error {
+	if p.StartTime != nil && p.EndTime != nil && p.StartTime.After(*p.EndTime) {
+		return errors.Errorf("dump start time can't be greater than end time")
+	}
+
+	return nil
+}
+
 func CreateDump(q *reform.Querier, params CreateDumpParams) (*Dump, error) {
+	if err := params.Validate(); err != nil {
+		return nil, errors.Wrap(err, "invalid dump creation params")
+	}
+
 	id := uuid.New().String()
 	if err := checkUniqueDumpID(q, id); err != nil {
 		return nil, err
diff --git a/managed/models/dump_helpers_test.go b/managed/models/dump_helpers_test.go
index e8a96d2e9b3..f387d900e8b 100644
--- a/managed/models/dump_helpers_test.go
+++ b/managed/models/dump_helpers_test.go
@@ -37,26 +37,45 @@ func TestDumps(t *testing.T) {
 	require.NoError(t, err)
 	t.Cleanup(func() {
 		require.NoError(t, tx.Rollback())
-		require.NoError(t, sqlDB.Close())
 	})
 
 	t.Run("create", func(t *testing.T) {
-		createDumpParams := models.CreateDumpParams{
-			ServiceNames: []string{"foo", "bar"},
-			StartTime:    time.Now(),
-			EndTime:      time.Now().Add(10 * time.Minute),
-			ExportQAN:    false,
-			IgnoreLoad:   true,
-		}
-		dump, err := models.CreateDump(tx.Querier, createDumpParams)
-		require.NoError(t, err)
-		assert.NotEmpty(t, dump.ID)
-		assert.Equal(t, models.DumpStatusInProgress, dump.Status)
-		assert.ElementsMatch(t, createDumpParams.ServiceNames, dump.ServiceNames)
-		assert.Equal(t, createDumpParams.StartTime, dump.StartTime)
-		assert.Equal(t, createDumpParams.EndTime, dump.EndTime)
-		assert.Equal(t, createDumpParams.ExportQAN, dump.ExportQAN)
-		assert.Equal(t, createDumpParams.IgnoreLoad, dump.IgnoreLoad)
+		t.Run("normal", func(t *testing.T) {
+			endTime := time.Now()
+			startTime := endTime.Add(-10 * time.Minute)
+
+			createDumpParams := models.CreateDumpParams{
+				ServiceNames: []string{"foo", "bar"},
+				StartTime:    &startTime,
+				EndTime:      &endTime,
+				ExportQAN:    false,
+				IgnoreLoad:   true,
+			}
+			dump, err := models.CreateDump(tx.Querier, createDumpParams)
+			require.NoError(t, err)
+			assert.NotEmpty(t, dump.ID)
+			assert.Equal(t, models.DumpStatusInProgress, dump.Status)
+			assert.ElementsMatch(t, createDumpParams.ServiceNames, dump.ServiceNames)
+			assert.Equal(t, createDumpParams.StartTime, dump.StartTime)
+			assert.Equal(t, createDumpParams.EndTime, dump.EndTime)
+			assert.Equal(t, createDumpParams.ExportQAN, dump.ExportQAN)
+			assert.Equal(t, createDumpParams.IgnoreLoad, dump.IgnoreLoad)
+		})
+
+		t.Run("invalid start and end time", func(t *testing.T) {
+			endTime := time.Now()
+			startTime := endTime.Add(10 * time.Minute)
+
+			createDumpParams := models.CreateDumpParams{
+				ServiceNames: []string{"foo", "bar"},
+				StartTime:    &startTime,
+				EndTime:      &endTime,
+				ExportQAN:    false,
+				IgnoreLoad:   true,
+			}
+			_, err := models.CreateDump(tx.Querier, createDumpParams)
+			require.EqualError(t, err, "invalid dump creation params: dump start time can't be greater than end time")
+		})
 	})
 
 	t.Run("find", func(t *testing.T) {
@@ -64,10 +83,13 @@ func TestDumps(t *testing.T) {
 		require.NoError(t, err)
 		defer findTX.Rollback() //nolint:errcheck
 
+		endTime := time.Now()
+		startTime := endTime.Add(-10 * time.Minute)
+
 		dump1, err := models.CreateDump(findTX.Querier, models.CreateDumpParams{
 			ServiceNames: []string{"foo", "bar"},
-			StartTime:    time.Now(),
-			EndTime:      time.Now().Add(10 * time.Minute),
+			StartTime:    &startTime,
+			EndTime:      &endTime,
 			ExportQAN:    false,
 			IgnoreLoad:   true,
 		})
@@ -75,8 +97,8 @@ func TestDumps(t *testing.T) {
 
 		dump2, err := models.CreateDump(findTX.Querier, models.CreateDumpParams{
 			ServiceNames: []string{"foo", "bar"},
-			StartTime:    time.Now(),
-			EndTime:      time.Now().Add(10 * time.Minute),
+			StartTime:    &startTime,
+			EndTime:      &endTime,
 			ExportQAN:    false,
 			IgnoreLoad:   true,
 		})
@@ -87,8 +109,8 @@ func TestDumps(t *testing.T) {
 
 		dump3, err := models.CreateDump(findTX.Querier, models.CreateDumpParams{
 			ServiceNames: []string{"foo", "bar"},
-			StartTime:    time.Now(),
-			EndTime:      time.Now().Add(10 * time.Minute),
+			StartTime:    &startTime,
+			EndTime:      &endTime,
 			ExportQAN:    false,
 			IgnoreLoad:   true,
 		})
diff --git a/managed/models/dump_reform.go b/managed/models/dump_reform.go
index d62d7411ec3..a78ca52e9a6 100644
--- a/managed/models/dump_reform.go
+++ b/managed/models/dump_reform.go
@@ -64,8 +64,8 @@ var DumpTable = &dumpTableType{
 			{Name: "ID", Type: "string", Column: "id"},
 			{Name: "Status", Type: "DumpStatus", Column: "status"},
 			{Name: "ServiceNames", Type: "pq.StringArray", Column: "service_names"},
-			{Name: "StartTime", Type: "time.Time", Column: "start_time"},
-			{Name: "EndTime", Type: "time.Time", Column: "end_time"},
+			{Name: "StartTime", Type: "*time.Time", Column: "start_time"},
+			{Name: "EndTime", Type: "*time.Time", Column: "end_time"},
 			{Name: "ExportQAN", Type: "bool", Column: "export_qan"},
 			{Name: "IgnoreLoad", Type: "bool", Column: "ignore_load"},
 			{Name: "CreatedAt", Type: "time.Time", Column: "created_at"},
diff --git a/managed/services/dump/dump.go b/managed/services/dump/dump.go
index a3b6137a7cd..a0bb194da84 100644
--- a/managed/services/dump/dump.go
+++ b/managed/services/dump/dump.go
@@ -68,8 +68,8 @@ type Params struct {
 	User         string
 	Password     string
 	ServiceNames []string
-	StartTime    time.Time
-	EndTime      time.Time
+	StartTime    *time.Time
+	EndTime      *time.Time
 	ExportQAN    bool
 	IgnoreLoad   bool
 }
@@ -123,11 +123,11 @@ func (s *Service) StartDump(params *Params) (string, error) {
 		pmmDumpCmd.Args = append(pmmDumpCmd.Args, fmt.Sprintf("--instance=%s", serviceName))
 	}
 
-	if !params.StartTime.IsZero() {
+	if params.StartTime != nil {
 		pmmDumpCmd.Args = append(pmmDumpCmd.Args, fmt.Sprintf("--start-ts=%s", params.StartTime.Format(time.RFC3339)))
 	}
 
-	if !params.EndTime.IsZero() {
+	if params.EndTime != nil {
 		pmmDumpCmd.Args = append(pmmDumpCmd.Args, fmt.Sprintf("--end-ts=%s", params.EndTime.Format(time.RFC3339)))
 	}
 
diff --git a/managed/services/management/dump/dump.go b/managed/services/management/dump/dump.go
index 9a64d337abb..503a0cef2b2 100644
--- a/managed/services/management/dump/dump.go
+++ b/managed/services/management/dump/dump.go
@@ -114,11 +114,19 @@ func (s *Service) StartDump(ctx context.Context, req *dumpv1beta1.StartDumpReque
 	}
 
 	if req.StartTime != nil {
-		params.StartTime = req.StartTime.AsTime()
+		startTime := req.StartTime.AsTime()
+		params.StartTime = &startTime
 	}
 
 	if req.EndTime != nil {
-		params.EndTime = req.EndTime.AsTime()
+		endTime := req.EndTime.AsTime()
+		params.EndTime = &endTime
+	}
+
+	if params.StartTime != nil && params.EndTime != nil {
+		if params.StartTime.After(*params.EndTime) {
+			return nil, status.Error(codes.InvalidArgument, "Dump start time can't be greater enc time")
+		}
 	}
 
 	dumpID, err := s.dumpService.StartDump(params)
@@ -262,14 +270,22 @@ func convertDump(dump *models.Dump) (*dumpv1beta1.Dump, error) {
 		return nil, errors.Wrap(err, "failed to convert dump ds")
 	}
 
-	return &dumpv1beta1.Dump{
+	d := &dumpv1beta1.Dump{
 		DumpId:       dump.ID,
 		Status:       ds,
 		ServiceNames: dump.ServiceNames,
-		StartTime:    timestamppb.New(dump.StartTime),
-		EndTime:      timestamppb.New(dump.EndTime),
 		CreatedAt:    timestamppb.New(dump.CreatedAt),
-	}, nil
+	}
+
+	if dump.StartTime != nil {
+		d.StartTime = timestamppb.New(*dump.StartTime)
+	}
+
+	if dump.EndTime != nil {
+		d.EndTime = timestamppb.New(*dump.EndTime)
+	}
+
+	return d, nil
 }
 
 func convertDumpStatus(status models.DumpStatus) (dumpv1beta1.DumpStatus, error) {