I am using saveAll method of JpaRepository and the all the elements are not being saved in the table while it worked well in the other table with the same saveAll method

i need to adjust the result of findall result jpa repository. Here is the entity

I am using the findAll() method in spring data jpa to return a list of orders and I wrap them in Optional class. Within the method implementation I check if there is a data in the optional to return it or to throw a run time exception. My tables are empty, and I still got 200 code status with an empty list, why the exception is not thrown. always the if block executed?

When delete User record, I want to delete rfid record And when deleting rfid record not want to delete user record , only one rfid allow to use for one user (one to one relationship) also i don’t need to store rfid record id in user record. how to achieve this?