Features:

- Node group CRUD operations with traffic-based filtering
  - Three grouping modes: average distribution, subscription-based, and traffic-based
  - Automatic and manual group recalculation with history tracking
  - Group assignment preview before applying changes
  - User subscription group locking to prevent automatic reassignment
  - Subscribe-to-group mapping configuration
  - Group calculation history and detailed reports
  - System configuration for group management (enabled/mode/auto_create)

  Database:
  - Add node_group table for group definitions
  - Add group_history and group_history_detail tables for tracking
  - Add node_group_ids (JSON) to nodes and subscribe tables
  - Add node_group_id and group_locked fields to user_subscribe table
  - Add migration files for schema changes

internal/logic/admin/group/deleteNodeGroupLogic.go

@@ -0,0 +1,61 @@
+package group
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/perfect-panel/server/internal/model/group"
+	"github.com/perfect-panel/server/internal/svc"
+	"github.com/perfect-panel/server/internal/types"
+	"github.com/perfect-panel/server/pkg/logger"
+	"gorm.io/gorm"
+)
+
+type DeleteNodeGroupLogic struct {
+	logger.Logger
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+}
+
+func NewDeleteNodeGroupLogic(ctx context.Context, svcCtx *svc.ServiceContext) *DeleteNodeGroupLogic {
+	return &DeleteNodeGroupLogic{
+		Logger: logger.WithContext(ctx),
+		ctx:    ctx,
+		svcCtx: svcCtx,
+	}
+}
+
+func (l *DeleteNodeGroupLogic) DeleteNodeGroup(req *types.DeleteNodeGroupRequest) error {
+	// 查询节点组信息
+	var nodeGroup group.NodeGroup
+	if err := l.svcCtx.DB.Where("id = ?", req.Id).First(&nodeGroup).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return errors.New("node group not found")
+		}
+		logger.Errorf("failed to find node group: %v", err)
+		return err
+	}
+
+	// 检查是否有关联节点
+	var nodeCount int64
+	if err := l.svcCtx.DB.Table("nodes").Where("node_group_id = ?", nodeGroup.Id).Count(&nodeCount).Error; err != nil {
+		logger.Errorf("failed to count nodes in group: %v", err)
+		return err
+	}
+	if nodeCount > 0 {
+		return fmt.Errorf("cannot delete group with %d associated nodes, please migrate nodes first", nodeCount)
+	}
+
+	// 使用 GORM Transaction 删除节点组
+	return l.svcCtx.DB.Transaction(func(tx *gorm.DB) error {
+		// 删除节点组
+		if err := tx.Where("id = ?", req.Id).Delete(&group.NodeGroup{}).Error; err != nil {
+			logger.Errorf("failed to delete node group: %v", err)
+			return err // 自动回滚
+		}
+
+		logger.Infof("deleted node group: id=%d", nodeGroup.Id)
+		return nil // 自动提交
+	})
+}