diff --git a/src/app/common/themes/themes.less b/src/app/common/themes/themes.less
index fcb94aae..a5bab673 100644
--- a/src/app/common/themes/themes.less
+++ b/src/app/common/themes/themes.less
@@ -1,7 +1,7 @@
 @base-color: #eceeec;
 @base-background: rgba(21, 23, 21, 1);
 @base-background-transparent: rgba(21, 23, 21, 0.7);
-@base-background-dev: rgba(57, 0, 78, 0.7);
+@base-background-dev: rgba(21, 23, 48, 0.7);
 @base-border: rgba(241, 246, 243, 0.08);
 @background-session: rgba(13, 13, 13, 0.85);
 @background-session-components: rgba(48, 49, 48, 0.6);
diff --git a/wavesrv/pkg/sstore/migrate.go b/wavesrv/pkg/sstore/migrate.go
index afd8bfd7..82d96393 100644
--- a/wavesrv/pkg/sstore/migrate.go
+++ b/wavesrv/pkg/sstore/migrate.go
@@ -4,8 +4,10 @@
 package sstore
 
 import (
+	"errors"
 	"fmt"
 	"io"
+	"io/fs"
 	"log"
 	"os"
 	"strconv"
@@ -40,11 +42,14 @@ func MakeMigrate() (*migrate.Migrate, error) {
 	return m, nil
 }
 
-func copyFile(srcFile string, dstFile string) error {
+func copyFile(srcFile string, dstFile string, notFoundOk bool) error {
 	if srcFile == dstFile {
 		return fmt.Errorf("cannot copy %s to itself", srcFile)
 	}
 	srcFd, err := os.Open(srcFile)
+	if notFoundOk && err != nil && errors.Is(err, fs.ErrNotExist) {
+		return nil
+	}
 	if err != nil {
 		return fmt.Errorf("cannot open %s: %v", err)
 	}
@@ -100,10 +105,16 @@ func MigrateUp(targetVersion uint) error {
 	}
 	log.Printf("[db] migrating from %d to %d\n", curVersion, targetVersion)
 	log.Printf("[db] backing up database %s to %s\n", DBFileName, DBFileNameBackup)
-	err = copyFile(GetDBName(), GetDBBackupName())
+	os.Remove(GetDBBackupName())    // don't report error
+	os.Remove(GetDBWALBackupName()) // don't report error
+	err = copyFile(GetDBName(), GetDBBackupName(), false)
 	if err != nil {
 		return fmt.Errorf("error creating database backup: %v", err)
 	}
+	err = copyFile(GetDBWALName(), GetDBWALBackupName(), true)
+	if err != nil {
+		return fmt.Errorf("error creating database(wal) backup: %v", err)
+	}
 	for newVersion := curVersion + 1; newVersion <= targetVersion; newVersion++ {
 		err = MigrateUpStep(m, newVersion)
 		if err != nil {
diff --git a/wavesrv/pkg/sstore/sstore.go b/wavesrv/pkg/sstore/sstore.go
index 3c3c4173..34a2ff04 100644
--- a/wavesrv/pkg/sstore/sstore.go
+++ b/wavesrv/pkg/sstore/sstore.go
@@ -34,7 +34,9 @@ import (
 
 const LineNoHeight = -1
 const DBFileName = "waveterm.db"
+const DBWALFileName = "waveterm.db-wal"
 const DBFileNameBackup = "backup.waveterm.db"
+const DBWALFileNameBackup = "backup.waveterm.db-wal"
 const MaxWebShareLineCount = 50
 const MaxWebShareScreenCount = 3
 const MaxLineStateSize = 4 * 1024 // 4k for now, can raise if needed
@@ -149,11 +151,21 @@ func GetDBName() string {
 	return path.Join(scHome, DBFileName)
 }
 
+func GetDBWALName() string {
+	scHome := scbase.GetWaveHomeDir()
+	return path.Join(scHome, DBWALFileName)
+}
+
 func GetDBBackupName() string {
 	scHome := scbase.GetWaveHomeDir()
 	return path.Join(scHome, DBFileNameBackup)
 }
 
+func GetDBWALBackupName() string {
+	scHome := scbase.GetWaveHomeDir()
+	return path.Join(scHome, DBWALFileNameBackup)
+}
+
 func IsValidConnectMode(mode string) bool {
 	return mode == ConnectModeStartup || mode == ConnectModeAuto || mode == ConnectModeManual
 }