perf(chat): 优化后台客服会话查询与状态

backend/internal/modules/chat/quick_reply.go

@@ -2,7 +2,12 @@ package chat
 
 import (
 	"context"
+	"errors"
 	"hfb_sys/backend/internal/model"
+	"strings"
+
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
 )
 
 const (
@@ -13,9 +18,26 @@ const (
 )
 
 func (r *Repository) UpdateRemark(ctx context.Context, principal Principal, conversationID uint64, remark string) error {
-	return r.db.WithContext(ctx).Model(&model.ChatParticipant{}).
-		Where("conversation_id = ? AND participant_type = ? AND participant_id = ?", conversationID, principal.Type, principal.ID).
-		Update("remark", remark).Error
+	if principal.Type != "admin" {
+		return ErrPermissionDenied
+	}
+	db := r.db.WithContext(ctx)
+	var conversation model.ChatConversation
+	if err := db.Select("id").First(&conversation, conversationID).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return ErrConversationNotFound
+		}
+		return err
+	}
+	state := model.ChatAdminConversationState{
+		ConversationID: conversationID,
+		AdminUserID:    principal.ID,
+		Remark:         strings.TrimSpace(remark),
+	}
+	return db.Clauses(clause.OnConflict{
+		Columns:   []clause.Column{{Name: "conversation_id"}, {Name: "admin_user_id"}},
+		DoUpdates: clause.AssignmentColumns([]string{"remark", "updated_at"}),
+	}).Create(&state).Error
 }
 func (r *Repository) ListQuickReplies(ctx context.Context, adminID uint64) ([]QuickReplyDTO, error) {
 	var replies []model.ChatQuickReply