sg := sync.WaitGroup{}
	for i := 0; i < 5; i++ {
		sg.Add(1)

		go func() {
			if u1, err := reusedb.Where("id = ?", users[0].ID).First(ctx); err != nil {
				t.Errorf("failed to find user, got error: %v", err)
			} else if u1.Name != users[0].Name || u1.ID != users[0].ID {
				t.Errorf("found invalid user, got %v, expect %v", u1, users[0])
			}

			if u2, err := reusedb.Where("id = ?", users[1].ID).First(ctx); err != nil {