diff --git a/core/database.go b/core/database.go
index 48482d1..55adee2 100644
--- a/core/database.go
+++ b/core/database.go
@@ -120,17 +120,37 @@ func (d *Database) GetAllKeywords() ([]string, error) {
 	return d.keywordsCache, nil
 }
 
-func (d *Database) RemoveKeywordsContaining(substring string) error {
-	_, err := d.db.Exec("DELETE FROM keywords WHERE keyword LIKE ?", "%"+substring+"%")
+func (d *Database) RemoveKeywordsContaining(substring string) ([]string, error) {
+	// 首先获取要删除的关键词列表
+	rows, err := d.db.Query("SELECT keyword FROM keywords WHERE keyword LIKE ?", "%"+substring+"%")
 	if err != nil {
-		return err
+		return nil, err
 	}
+	defer rows.Close()
+
+	var removedKeywords []string
+	for rows.Next() {
+		var keyword string
+		if err := rows.Scan(&keyword); err != nil {
+			return nil, err
+		}
+		removedKeywords = append(removedKeywords, keyword)
+	}
+
+	// 执行删除操作
+	_, err = d.db.Exec("DELETE FROM keywords WHERE keyword LIKE ?", "%"+substring+"%")
+	if err != nil {
+		return nil, err
+	}
+
+	// 从 FTS 表中也删除这些关键词
 	_, err = d.db.Exec("DELETE FROM keywords_fts WHERE keyword LIKE ?", "%"+substring+"%")
 	if err != nil {
-		return err
+		return nil, err
 	}
+
 	d.invalidateCache()
-	return nil
+	return removedKeywords, nil
 }
 
 func (d *Database) AddWhitelist(domain string) error {
@@ -171,6 +191,24 @@ func (d *Database) SearchKeywords(pattern string) ([]string, error) {
 	return d.executeQuery("SELECT keyword FROM keywords_fts WHERE keyword MATCH ?", pattern)
 }
 
+func (d *Database) KeywordExists(keyword string) (bool, error) {
+	var count int
+	err := d.db.QueryRow("SELECT COUNT(*) FROM keywords WHERE keyword = ?", keyword).Scan(&count)
+	if err != nil {
+		return false, err
+	}
+	return count > 0, nil
+}
+
+func (d *Database) WhitelistExists(domain string) (bool, error) {
+	var count int
+	err := d.db.QueryRow("SELECT COUNT(*) FROM whitelist WHERE domain = ?", domain).Scan(&count)
+	if err != nil {
+		return false, err
+	}
+	return count > 0, nil
+}
+
 func (d *Database) invalidateCache() {
 	d.mu.Lock()
 	defer d.mu.Unlock()
diff --git a/core/link_filter.go b/core/link_filter.go
index e1f8767..f041b29 100644
--- a/core/link_filter.go
+++ b/core/link_filter.go
@@ -19,19 +19,34 @@ type LinkFilter struct {
 	linkPattern *regexp.Regexp
 }
 
-func NewLinkFilter(dbFile string) *LinkFilter {
+func NewLinkFilter(dbFile string) (*LinkFilter, error) {
+	db, err := NewDatabase(dbFile)
+	if err != nil {
+		return nil, err
+	}
 	lf := &LinkFilter{
-		db: NewDatabase(dbFile),
+		db: db,
 	}
 	lf.linkPattern = regexp.MustCompile(`(?i)\b(?:(?:https?://)?(?:(?:www\.)?(?:[a-zA-Z0-9-]+\.)+[a-zA-Z]{2,}|(?:t\.me|telegram\.me))(?:/[^\s]*)?)`)
-	lf.LoadDataFromFile()
-	return lf
+	err = lf.LoadDataFromFile()
+	if err != nil {
+		return nil, err
+	}
+	return lf, nil
 }
 
-func (lf *LinkFilter) LoadDataFromFile() {
-	lf.keywords = lf.db.GetAllKeywords()
-	lf.whitelist = lf.db.GetAllWhitelist()
+func (lf *LinkFilter) LoadDataFromFile() error {
+	var err error
+	lf.keywords, err = lf.db.GetAllKeywords()
+	if err != nil {
+		return err
+	}
+	lf.whitelist, err = lf.db.GetAllWhitelist()
+	if err != nil {
+		return err
+	}
 	logger.Printf("Loaded %d keywords and %d whitelist entries from database", len(lf.keywords), len(lf.whitelist))
+	return nil
 }
 
 func (lf *LinkFilter) NormalizeLink(link string) string {
@@ -74,7 +89,7 @@ func (lf *LinkFilter) IsWhitelisted(link string) bool {
 	return false
 }
 
-func (lf *LinkFilter) AddKeyword(keyword string) {
+func (lf *LinkFilter) AddKeyword(keyword string) error {
 	if lf.linkPattern.MatchString(keyword) {
 		keyword = lf.NormalizeLink(keyword)
 	}
@@ -82,12 +97,15 @@ func (lf *LinkFilter) AddKeyword(keyword string) {
 	for _, k := range lf.keywords {
 		if k == keyword {
 			logger.Printf("Keyword already exists: %s", keyword)
-			return
+			return nil
 		}
 	}
-	lf.db.AddKeyword(keyword)
+	err := lf.db.AddKeyword(keyword)
+	if err != nil {
+		return err
+	}
 	logger.Printf("New keyword added: %s", keyword)
-	lf.LoadDataFromFile()
+	return lf.LoadDataFromFile()
 }
 
 func (lf *LinkFilter) RemoveKeyword(keyword string) bool {
@@ -101,10 +119,16 @@ func (lf *LinkFilter) RemoveKeyword(keyword string) bool {
 	return false
 }
 
-func (lf *LinkFilter) RemoveKeywordsContaining(substring string) []string {
-	removed := lf.db.RemoveKeywordsContaining(substring)
-	lf.LoadDataFromFile()
-	return removed
+func (lf *LinkFilter) RemoveKeywordsContaining(substring string) ([]string, error) {
+	removed, err := lf.db.RemoveKeywordsContaining(substring)
+	if err != nil {
+		return nil, err
+	}
+	err = lf.LoadDataFromFile()
+	if err != nil {
+		return nil, err
+	}
+	return removed, nil
 }
 
 func (lf *LinkFilter) ShouldFilter(text string) (bool, []string) {
@@ -147,7 +171,11 @@ func (lf *LinkFilter) ShouldFilter(text string) (bool, []string) {
 func (lf *LinkFilter) HandleKeywordCommand(bot *tgbotapi.BotAPI, message *tgbotapi.Message, command string, args string) {
 	switch command {
 	case "list":
-		keywords := lf.db.GetAllKeywords()
+		keywords, err := lf.db.GetAllKeywords()
+		if err != nil {
+			bot.Send(tgbotapi.NewMessage(message.Chat.ID, "获取关键词列表时发生错误。"))
+			return
+		}
 		if len(keywords) == 0 {
 			bot.Send(tgbotapi.NewMessage(message.Chat.ID, "关键词列表为空。"))
 		} else {
@@ -156,20 +184,34 @@ func (lf *LinkFilter) HandleKeywordCommand(bot *tgbotapi.BotAPI, message *tgbota
 	case "add":
 		if args != "" {
 			keyword := args
-			if !lf.db.KeywordExists(keyword) {
-				lf.AddKeyword(keyword)
+			exists, err := lf.db.KeywordExists(keyword)
+			if err != nil {
+				bot.Send(tgbotapi.NewMessage(message.Chat.ID, "检查关键词时发生错误。"))
+				return
+			}
+			if !exists {
+				err = lf.AddKeyword(keyword)
+				if err != nil {
+					bot.Send(tgbotapi.NewMessage(message.Chat.ID, "添加关键词时发生错误。"))
+					return
+				}
 				bot.Send(tgbotapi.NewMessage(message.Chat.ID, fmt.Sprintf("关键词 '%s' 已添加。", keyword)))
 			} else {
 				bot.Send(tgbotapi.NewMessage(message.Chat.ID, fmt.Sprintf("关键词 '%s' 已存在。", keyword)))
 			}
 		}
+
 	case "delete":
 		if args != "" {
 			keyword := args
 			if lf.RemoveKeyword(keyword) {
 				bot.Send(tgbotapi.NewMessage(message.Chat.ID, fmt.Sprintf("关键词 '%s' 已删除。", keyword)))
 			} else {
-				similarKeywords := lf.db.SearchKeywords(keyword)
+				similarKeywords, err := lf.db.SearchKeywords(keyword)
+				if err != nil {
+					bot.Send(tgbotapi.NewMessage(message.Chat.ID, "搜索关键词时发生错误。"))
+					return
+				}
 				if len(similarKeywords) > 0 {
 					SendLongMessage(bot, message.Chat.ID, fmt.Sprintf("未找到精确匹配的关键词 '%s'。\n\n以下是相似的关键词：", keyword), similarKeywords)
 				} else {
@@ -180,7 +222,11 @@ func (lf *LinkFilter) HandleKeywordCommand(bot *tgbotapi.BotAPI, message *tgbota
 	case "deletecontaining":
 		if args != "" {
 			substring := args
-			removedKeywords := lf.RemoveKeywordsContaining(substring)
+			removedKeywords, err := lf.RemoveKeywordsContaining(substring)
+			if err != nil {
+				bot.Send(tgbotapi.NewMessage(message.Chat.ID, "删除关键词时发生错误。"))
+				return
+			}
 			if len(removedKeywords) > 0 {
 				SendLongMessage(bot, message.Chat.ID, fmt.Sprintf("已删除包含 '%s' 的以下关键词：", substring), removedKeywords)
 			} else {
@@ -195,17 +241,30 @@ func (lf *LinkFilter) HandleKeywordCommand(bot *tgbotapi.BotAPI, message *tgbota
 func (lf *LinkFilter) HandleWhitelistCommand(bot *tgbotapi.BotAPI, message *tgbotapi.Message, command string, args string) {
 	switch command {
 	case "listwhite":
-		whitelist := lf.db.GetAllWhitelist()
+		whitelist, err := lf.db.GetAllWhitelist()
+		if err != nil {
+			bot.Send(tgbotapi.NewMessage(message.Chat.ID, "获取白名单时发生错误。"))
+			return
+		}
 		if len(whitelist) == 0 {
 			bot.Send(tgbotapi.NewMessage(message.Chat.ID, "白名单为空。"))
 		} else {
-			SendLongMessageWithoutNumbering(bot, message.Chat.ID, "白名单域名列表：", whitelist)
+			bot.Send(tgbotapi.NewMessage(message.Chat.ID, "白名单域名列表：\n"+strings.Join(whitelist, "\n")))
 		}
 	case "addwhite":
 		if args != "" {
 			domain := strings.ToLower(args)
-			if !lf.db.WhitelistExists(domain) {
-				lf.db.AddWhitelist(domain)
+			exists, err := lf.db.WhitelistExists(domain)
+			if err != nil {
+				bot.Send(tgbotapi.NewMessage(message.Chat.ID, "检查白名单时发生错误。"))
+				return
+			}
+			if !exists {
+				err = lf.db.AddWhitelist(domain)
+				if err != nil {
+					bot.Send(tgbotapi.NewMessage(message.Chat.ID, "添加到白名单时发生错误。"))
+					return
+				}
 				bot.Send(tgbotapi.NewMessage(message.Chat.ID, fmt.Sprintf("域名 '%s' 已添加到白名单。", domain)))
 			} else {
 				bot.Send(tgbotapi.NewMessage(message.Chat.ID, fmt.Sprintf("域名 '%s' 已在白名单中。", domain)))
@@ -214,8 +273,17 @@ func (lf *LinkFilter) HandleWhitelistCommand(bot *tgbotapi.BotAPI, message *tgbo
 	case "delwhite":
 		if args != "" {
 			domain := strings.ToLower(args)
-			if lf.db.WhitelistExists(domain) {
-				lf.db.RemoveWhitelist(domain)
+			exists, err := lf.db.WhitelistExists(domain)
+			if err != nil {
+				bot.Send(tgbotapi.NewMessage(message.Chat.ID, "检查白名单时发生错误。"))
+				return
+			}
+			if exists {
+				err = lf.db.RemoveWhitelist(domain)
+				if err != nil {
+					bot.Send(tgbotapi.NewMessage(message.Chat.ID, "从白名单删除时发生错误。"))
+					return
+				}
 				bot.Send(tgbotapi.NewMessage(message.Chat.ID, fmt.Sprintf("域名 '%s' 已从白名单中删除。", domain)))
 			} else {
 				bot.Send(tgbotapi.NewMessage(message.Chat.ID, fmt.Sprintf("域名 '%s' 不在白名单中。", domain)))