删批次时释放猪栏

internal/infra/repository/pig_batch_repository.go

@@ -15,6 +15,7 @@ type PigBatchRepository interface {
 	UpdatePigBatch(batch *models.PigBatch) (*models.PigBatch, int64, error)
 	// DeletePigBatch 根据ID删除一个猪批次，返回受影响的行数和错误
 	DeletePigBatch(id uint) (int64, error)
+	DeletePigBatchTx(tx *gorm.DB, id uint) (int64, error)
 	ListPigBatches(isActive *bool) ([]*models.PigBatch, error)
 }
 
@@ -58,7 +59,11 @@ func (r *gormPigBatchRepository) UpdatePigBatch(batch *models.PigBatch) (*models
 
 // DeletePigBatch 根据ID删除一个猪批次 (GORM 会执行软删除)
 func (r *gormPigBatchRepository) DeletePigBatch(id uint) (int64, error) {
-	result := r.db.Delete(&models.PigBatch{}, id)
+	return r.DeletePigBatchTx(r.db, id)
+}
+
+func (r *gormPigBatchRepository) DeletePigBatchTx(tx *gorm.DB, id uint) (int64, error) {
+	result := tx.Delete(&models.PigBatch{}, id)
 	if result.Error != nil {
 		return 0, result.Error
 	}