Redirect db log into db.log file

db/db.go

@@ -25,8 +25,12 @@ func Connect() *gorm.DB {
 	if udb != nil {
 		return udb
 	}
+	logFile, err := os.OpenFile("db.log", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		panic(err)
+	}
 	newLogger := logger.New(
-		log.New(os.Stdout, "\r\n", log.LstdFlags),
+		log.New(logFile, "\r\n", log.LstdFlags),
 		logger.Config{
 			SlowThreshold:             time.Second,
 			LogLevel:                  logger.Error,