diff --git a/cmd/migration/main.go b/cmd/migration/main.go
index b841342..3e70ca2 100644
--- a/cmd/migration/main.go
+++ b/cmd/migration/main.go
@@ -25,6 +25,11 @@ func MigrateDb() {
 		log.Fatal(err)
 		return
 	}
+	defer func() {
+		if sqlDB, e := db.DB(); e == nil {
+			_ = sqlDB.Close()
+		}
+	}()
 	tx := db.Begin()
 	defer func() {
 		if err == nil {
diff --git a/database/backup.go b/database/backup.go
index 69bb43d..61a6db6 100644
--- a/database/backup.go
+++ b/database/backup.go
@@ -42,6 +42,11 @@ func GetDb(exclude string) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
+	defer func() {
+		if sqlDB, e := backupDb.DB(); e == nil {
+			_ = sqlDB.Close()
+		}
+	}()
 	defer os.Remove(dbPath)
 
 	err = backupDb.AutoMigrate(
@@ -218,7 +223,9 @@ func ImportDB(file multipart.File) error {
 		return common.NewErrorf("Error checking db: %v", err)
 	}
 	newDb_db, _ := newDb.DB()
-	newDb_db.Close()
+	if newDb_db != nil {
+		newDb_db.Close()
+	}
 
 	// Backup the current database for fallback
 	fallbackPath := fmt.Sprintf("%s.backup", config.GetDBPath())
diff --git a/database/db.go b/database/db.go
index b302775..1af09ed 100644
--- a/database/db.go
+++ b/database/db.go
@@ -55,7 +55,10 @@ func OpenDB(dbPath string) error {
 	if strings.Contains(dbPath, "?") {
 		sep = "&"
 	}
-	dsn := dbPath + sep + "_busy_timeout=10000&_journal_mode=WAL"
+	// _cache_size=-200 caps each connection's page cache at ~200 KiB
+	// (default is ~2 MiB), reducing memory amplification if a connection
+	// escapes the pool.
+	dsn := dbPath + sep + "_busy_timeout=10000&_journal_mode=WAL&_cache_size=-200"
 	db, err = gorm.Open(sqlite.Open(dsn), c)
 	if err != nil {
 		return err
@@ -66,8 +69,9 @@ func OpenDB(dbPath string) error {
 		return err
 	}
 	sqlDB.SetMaxOpenConns(25)
-	sqlDB.SetMaxIdleConns(5)
+	sqlDB.SetMaxIdleConns(2)
 	sqlDB.SetConnMaxLifetime(time.Hour)
+	sqlDB.SetConnMaxIdleTime(5 * time.Minute)
 
 	if config.IsDebug() {
 		db = db.Debug()
diff --git a/service/stats.go b/service/stats.go
index 35cdfc7..6234b97 100644
--- a/service/stats.go
+++ b/service/stats.go
@@ -83,7 +83,8 @@ func (s *StatsService) SaveStats(enableTraffic bool) error {
 	if !enableTraffic {
 		return nil
 	}
-	return tx.Create(&stats).Error
+	err = tx.Create(&stats).Error
+	return err
 }
 
 func (s *StatsService) GetStats(resource string, tag string, limit int) ([]model.Stats, error) {