feat: SEO backend data (1/4)

internal/infrastructure/persistence/repositories/siteRepository.go

@@ -106,11 +106,18 @@ func (s *SiteRepository) Create(site domain.Site) (domain.Site, error) {
 		return tx.Create(&model).Error
 	})
 	if err != nil {
-		return domain.Site{}, err
+		return domain.Site{}, s.explainKeyFailure(model.Key, err)
 	}
 	return mappers.SiteToDomain(model, 0), nil
 }
 
+func (s *SiteRepository) explainKeyFailure(key string, cause error) error {
+	if _, err := s.GetByKey(key); err == nil {
+		return domain.ErrSiteKeyTaken
+	}
+	return cause
+}
+
 func lockAllSites(tx *gorm.DB) error {
 	var locked []entity.Site
 	return tx.Clauses(clause.Locking{Strength: "UPDATE"}).Order("id ASC").Find(&locked).Error
@@ -135,6 +142,9 @@ func (s *SiteRepository) Update(site domain.Site) (domain.Site, error) {
 		"default_social_image_id": site.DefaultSocialImageID,
 		"default_robots":          site.DefaultRobots,
 		"locale":                  site.Locale,
+		"site_name":               site.SiteName,
+		"title_template":          site.TitleTemplate,
+		"default_description":     site.DefaultDescription,
 	}
 	if _, err := s.Get(site.ID); err != nil {
 		return domain.Site{}, err