diff --git a/handlers/backend/tag.go b/handlers/backend/tag.go
index 27ae7c2..853994b 100644
--- a/handlers/backend/tag.go
+++ b/handlers/backend/tag.go
@@ -7,6 +7,7 @@ import (
 	"goblog/models"
 
 	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
 )
 
 // 获取标签列表
@@ -103,7 +104,13 @@ func DeleteTag(c *gin.Context) {
 		return
 	}
 
-	if err := database.DB.Delete(&tag).Error; err != nil {
+	// 使用事务：先清除 post_tags 中该标签的关联记录，再删除标签本身，保证数据一致性
+	if err := database.DB.Transaction(func(tx *gorm.DB) error {
+		if err := tx.Exec("DELETE FROM post_tags WHERE tag_id = ?", tag.ID).Error; err != nil {
+			return err
+		}
+		return tx.Delete(&tag).Error
+	}); err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "删除标签失败"})
 		return
 	}
diff --git a/handlers/frontend/view.go b/handlers/frontend/view.go
index 33c4672..1ec044e 100644
--- a/handlers/frontend/view.go
+++ b/handlers/frontend/view.go
@@ -131,10 +131,10 @@ func IndexView(c *gin.Context) {
 
 	// 如果摘要为空，则从内容中提取摘要
 	for i := range posts {
-		if posts[i].Summary == "" && posts[i].Content != "" && len(posts[i].Content) > 120 {
-			posts[i].Summary = posts[i].Content[:120]
-		} else {
-			posts[i].Summary = posts[i].Content
+		p := &posts[i]
+		if p.Summary == "" && p.SearchableText != "" {
+			runes := []rune(p.SearchableText)
+			p.Summary = string(runes[:min(len(runes), 120)])
 		}
 	}