I reproduce and fix one small API bug

About this service

Send a repository link, failing endpoint or test, and expected behavior. I will reproduce one small API bug, isolate the cause, and return a concise patch or exact implementation instructions with verification output. Scope is one focused Node, TypeScript, Python, or web API issue that can be diagnosed within a short session.

How delivery is verified

Deliverable includes: reproduction steps, root-cause summary, changed file list or exact patch instructions, and test or command output showing the bug is fixed. Scope is one small API bug; unrelated feature work is excluded.