How can I delete the product and corresponding logs?

Question

I want to delete all the product logs of a specific product depending on its product_id(FK). I created product logs to monitor when the product it's created and updated. I deleted a product by using its SKU. My problem is when I try to delete a product and its logs this error show Http failure response for http://localhost:8080/products/deletebysku?sku=c5c00b00-825f-45b8-80fe-1d357716a069: 405 OK. I can't delete the product if the product log has two or more same product_id(FK).

products table

products_log table

ProductService.java - Delete a product record using SKU

public void deleteProductBySku(String sku){
    Products product = productsRepository.findBySkuEquals(sku);
    ProductsLog productsLog = productsLogRepository.findByProductIdEquals(product.getId());
    int id = product.getId();
    this.delete(id);
    productsLogService.delete(productsLog.getId());
}

ProductLogService - deleting a specific record by using the method deleteById() of JpaRepository

public void delete(int id)
{
    productsLogRepository.deleteById(id);
} 

ProductsRepository

public interface ProductsRepository extends JpaRepository<Products, Integer>
{
    //find a product record using sku
    Products findBySkuEquals(String sku);
}

ProductsLogRepository

public interface ProductsLogRepository extends JpaRepository<ProductsLog, Integer> {
    //find a product log using productId
    ProductsLog findByProductIdEquals(int id);
}

ProductsController - Delete a product record using SKU (localhost:8080/products/deletebysku?sku=samplesku)

@RequestMapping(value="/products/deletebysku", method=RequestMethod.DELETE)
@ResponseBody
private void deleteProductBySku(@RequestParam String sku)
{
    productsService.deleteProductBySku(sku);
}