There is no such thing as no code, just code that someone else wrote. Not that such code isn’t trivial to get from a basic LLM that you can run locally for pennies a year.

blog.mlc.ai/…/GPU-Accelerated-LLM-on-Orange-Pi

Just setup a standard PostgreSQL database and then work with the LLM to write some C# code to connect to it and create, update and delete data per your own system needs. Hire a part time programmer if you need more help. They usually can get you where you want to be cheaply if they are FSF developers and you don’t restrict them from using the code they write for you.