GitLab fixes 500 errors from oversized comments across nine vulnerability GraphQL mutations

A GitLab merge request, gitlab-org/gitlab!269616, adds a length check to the comment argument of nine GraphQL mutations in its vulnerability management features. The bug stemmed from a 50,000-character limit that the model enforced but the API did not, so oversized input produced a generic internal server error. Bulk dismiss was worse, failing only at the database constraint because it skipped model validations. The change went through several rounds of CI fixes, including regenerating public GraphQL docs and introspection schemas, and was refined after reviewer feedback. The author's write-up highlights how easily such validation gaps ship unnoticed.
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