diff --git a/app/app.go b/app/app.go
index ae7f0ff..abdaf9d 100644
--- a/app/app.go
+++ b/app/app.go
@@ -23,46 +23,48 @@ import (
 // TODO: review consts
 const (
 	// Handlers keys
-	InvalidRequest    string = "invalid_request"
-	MalformedJSON     string = "malformed_json"
-	TokenBlacklisted  string = "token_blacklisted"
-	TokenInvalid      string = "token_invalid"
-	ValidationFailed  string = "validation_failed"
-	UntilBeforeTo     string = "until_before_to"
-	InternalError     string = "internal_error"
-	NotFound          string = "not_found"
-	Created           string = "created"
-	Updated           string = "updated"
-	Deleted           string = "deleted"
-	Enabled           string = "enabled"
-	Disabled          string = "disabled"
-	Retrieved         string = "retrieved"
-	ErrorCreating     string = "error_creating"
-	ErrorUpdating     string = "error_updating"
-	ErrorEnabling     string = "error_enabling"
-	ErrorDisabling    string = "error_disabling"
-	ErrorGetting      string = "error_getting"
-	ErrorGettingAll   string = "error_getting_all"
-	ErrorMailing      string = "error_mailing"
-	InvalidEntityID   string = "invalid_entity_id"
-	NotImplemented    string = "not_implemented"
-	NotPassValidation string = "not_pass_validation"
-	NotEnoughBalance  string = "not_enough_balance"
+	InvalidRequest    = "invalid_request"
+	MalformedJSON     = "malformed_json"
+	TokenBlacklisted  = "token_blacklisted"
+	TokenInvalid      = "token_invalid"
+	ValidationFailed  = "validation_failed"
+	UntilBeforeTo     = "until_before_to"
+	InternalError     = "internal_error"
+	NotFound          = "not_found"
+	Created           = "created"
+	Updated           = "updated"
+	Deleted           = "deleted"
+	Enabled           = "enabled"
+	Disabled          = "disabled"
+	Retrieved         = "retrieved"
+	ErrorCreating     = "error_creating"
+	ErrorUpdating     = "error_updating"
+	ErrorEnabling     = "error_enabling"
+	ErrorDisabling    = "error_disabling"
+	ErrorGetting      = "error_getting"
+	ErrorGettingAll   = "error_getting_all"
+	ErrorMailing      = "error_mailing"
+	InvalidEntityID   = "invalid_entity_id"
+	NotImplemented    = "not_implemented"
+	NotPassValidation = "not_pass_validation"
+	NotEnoughBalance  = "not_enough_balance"
+	InvalidIdentifier = "invalid_identifier"
 
 	// User keys (DB)
-	UserUsernameKey       string = "username_key"
-	UserEmailKey          string = "email_key"
-	UsernameAlreadyExists string = "username_already_exists"
-	UserSessionKey        string = "user_session_key"
-	EmailAlreadyExists    string = "email_already_exists"
-	PhoneNumberKey        string = "phone_number_key"
-	PhoneAlreadyExists    string = "phone_already_exists"
+	UserUsernameKey       = "username_key"
+	UserEmailKey          = "email_key"
+	UsernameAlreadyExists = "username_already_exists"
+	UserSessionKey        = "user_session_key"
+	EmailAlreadyExists    = "email_already_exists"
+	PhoneNumberKey        = "phone_number_key"
+	PhoneAlreadyExists    = "phone_already_exists"
+	NoRowsAffected        = "no rows in result set"
 
 	// Auth
-	TokenPayload         string = "token_payload"
-	LoggedIn             string = "logged_in"
-	IncorrectPassword    string = "incorrect_password"
-	ErrorGeneratingToken string = "error_generating_token"
+	TokenPayload         = "token_payload"
+	LoggedIn             = "logged_in"
+	IncorrectPassword    = "incorrect_password"
+	ErrorGeneratingToken = "error_generating_token"
 )
 
 var (
@@ -78,14 +80,7 @@ const (
 	EnvironmentProduction  Environment = "production"
 )
 
-type LogLevel string
-
-const (
-	LogLevelDebug LogLevel = "debug"
-	LogLevelInfo  LogLevel = "info"
-	LogLevelWarn  LogLevel = "warn"
-	LogLevelError LogLevel = "error"
-)
+type LogLevel slog.Level
 
 type Config struct {
 	// default ""
@@ -101,7 +96,7 @@ type Config struct {
 	EnvMode Environment
 
 	// default "debug"
-	LogLevel LogLevel
+	LogLevel slog.Level
 
 	// default "UTC"
 	Timezone string
@@ -147,7 +142,7 @@ func New(config ...Config) *App {
 		Version:            "",
 		EnvDirectory:       ".env",
 		EnvMode:            EnvironmentDevelopment,
-		LogLevel:           LogLevelDebug,
+		LogLevel:           slog.LevelDebug,
 		Timezone:           "UTC",
 		Paseto:             nil,
 		SMTPHost:           "",
@@ -168,8 +163,8 @@ func New(config ...Config) *App {
 		if cfg.EnvMode == EnvironmentTesting {
 			cfg.EnvDirectory = "./../../.env"
 		}
-		if cfg.LogLevel == "" {
-			cfg.LogLevel = "debug"
+		if cfg.LogLevel == slog.LevelDebug {
+			cfg.LogLevel = slog.LevelDebug
 		}
 		if cfg.Timezone == "" {
 			cfg.Timezone = "UTC"
@@ -201,9 +196,20 @@ func New(config ...Config) *App {
 		cfg.EnvMode = Environment(os.Getenv("ENV_MODE"))
 	}
 
-	if cfg.LogLevel == "" && os.Getenv("LOG_LEVEL") != "" {
-		cfg.LogLevel = LogLevel(os.Getenv("LOG_LEVEL"))
-		logLevel = string(cfg.LogLevel)
+	if os.Getenv("LOG_LEVEL") != "" {
+		logLevel = os.Getenv("LOG_LEVEL")
+		switch logLevel {
+		case "debug":
+			cfg.LogLevel = slog.LevelDebug
+		case "info":
+			cfg.LogLevel = slog.LevelInfo
+		case "warn":
+			cfg.LogLevel = slog.LevelWarn
+		case "error":
+			cfg.LogLevel = slog.LevelError
+		default:
+			cfg.LogLevel = slog.LevelInfo
+		}
 	}
 
 	if cfg.Timezone == "" && os.Getenv("TIMEZONE") != "" {
@@ -217,7 +223,7 @@ func New(config ...Config) *App {
 	}
 	time.Local = loc
 
-	startRotativeLogger()
+	startRotativeLogger(cfg.LogLevel)
 
 	if cfg.Paseto == nil {
 		var ak paseto.V4AsymmetricSecretKey
@@ -335,7 +341,7 @@ func (a *App) EnvMode() Environment {
 	return a.config.EnvMode
 }
 
-func (a *App) LogLevel() LogLevel {
+func (a *App) LogLevel() slog.Level {
 	return a.config.LogLevel
 }
 
@@ -422,25 +428,6 @@ func loadEnvFile(envDirectory string) error {
 	return scanner.Err()
 }
 
-func slogLevelType(level string) slog.Level {
-	var logLevel slog.Level
-
-	switch strings.ToLower(level) {
-	case "debug":
-		logLevel = slog.LevelDebug
-	case "info":
-		logLevel = slog.LevelInfo
-	case "warn":
-		logLevel = slog.LevelWarn
-	case "error":
-		logLevel = slog.LevelError
-	default:
-		logLevel = slog.LevelInfo
-	}
-
-	return logLevel
-}
-
 func newLogger(level slog.Level) {
 	if err := os.MkdirAll("logs", 0755); err != nil {
 		fmt.Println("error creating logs directory:", err)
@@ -468,13 +455,13 @@ func newLogger(level slog.Level) {
 	slog.SetDefault(logger)
 }
 
-func startRotativeLogger() {
-	newLogger(slogLevelType(logLevel))
+func startRotativeLogger(level slog.Level) {
+	newLogger(level)
 
 	ticker := time.NewTicker(time.Hour * 24)
 	go func() {
 		for range ticker.C {
-			newLogger(slogLevelType(logLevel))
+			newLogger(level)
 		}
 	}()
 }