classification : suffix name from user input

Summary :
Expose an optional suffix field in the fine-tuning initiation endpoint’s request body. for reference, click here.
When provided, the created fine-tuned model’s name should be:

ft:{base_model}:{suffix}::{random}

Example:

if the suffix name given by user is lets say - "sneha" , then the fine tuned model name would look something ike this

ft:gpt-4.1-nano-2025-04-14:sneha::Bz5jJE3g

Keep in mind: The length of the input being given to the suffix parameter should be validated, and if there is any other validation that you think this parameter could need.

The payload names no files or tests; start by locating the fine-tuning initiation endpoint and its request schema. Confirm the optional suffix is accepted, validated for length and other applicable constraints, and produces the documented ft:{base_model}:{suffix}::{random} model name, then add or run coverage for the endpoint behavior.