Review a code change before it merges

Review the code change below. It [Purpose]. Look for, in this order: 1. Bugs: wrong logic, unhandled cases, race conditions, off-by-one errors. 2. Security: injection, missing authorization, leaked secrets, unchecked input. 3. Performance: needless work in loops, extra queries, memory that keeps growing. 4. Clarity, only where it would cause mistakes later. For each finding, give the file and line, what's wrong, why it matters, and a fix, and rate it High, Medium or Low, highest first. Skip formatting a linter would catch. If you find nothing serious, say so plainly instead of inventing issues. Diff: