fix: coderabbit suggestions

internal/controller/oauth_controller.go

@@ -169,8 +169,18 @@ func (controller *OAuthController) oauthCallbackHandler(c *gin.Context) {
 		name = fmt.Sprintf("%s (%s)", utils.Capitalize(strings.Split(user.Email, "@")[0]), strings.Split(user.Email, "@")[1])
 	}
 
+	var usename string
+
+	if user.PreferredUsername != "" {
+		log.Debug().Msg("Using preferred username from OAuth provider")
+		usename = user.PreferredUsername
+	} else {
+		log.Debug().Msg("No preferred username from OAuth provider, using pseudo username")
+		usename = strings.Replace(user.Email, "@", "_", -1)
+	}
+
 	controller.Auth.CreateSessionCookie(c, &config.SessionCookie{
-		Username:    user.PreferredUsername,
+		Username:    usename,
 		Name:        name,
 		Email:       user.Email,
 		Provider:    req.Provider,

internal/model/session_model.go

@@ -1,7 +1,7 @@
 package model
 
 type Session struct {
-	UUID        string `gorm:"column:uuid"`
+	UUID        string `gorm:"column:uuid;primaryKey"`
 	Username    string `gorm:"column:username"`
 	Email       string `gorm:"column:email"`
 	Name        string `gorm:"column:name"`

internal/service/auth_service.go

@@ -222,13 +222,13 @@ func (auth *AuthService) CreateSessionCookie(c *gin.Context, data *config.Sessio
 }
 
 func (auth *AuthService) DeleteSessionCookie(c *gin.Context) error {
-	session, err := auth.GetSessionCookie(c)
+	cookie, err := c.Cookie(auth.Config.SessionCookieName)
 
 	if err != nil {
 		return err
 	}
 
-	res := auth.Database.Unscoped().Where("uuid = ?", session.UUID).Delete(&model.Session{})
+	res := auth.Database.Unscoped().Where("uuid = ?", cookie).Delete(&model.Session{})
 
 	if res.Error != nil {
 		return res.Error

internal/service/database_service.go

@@ -39,6 +39,8 @@ func (ds *DatabaseService) Init() error {
 		return err
 	}
 
+	sqlDB.SetMaxOpenConns(1)
+
 	err = ds.migrateDatabase(sqlDB)
 
 	if err != nil && err != migrate.ErrNoChange {