export_too_large
The extraction would exceed the per-job row cap. 422, not 413 - the request entity is tiny; it is the result that will not fit. Split it with filters.
Problem shape
Every non-2xx response is an RFC 9457 application/problem+json body. The type URI below is stable and machine-matchable, so branch on the final path segment (the code) and treat the status as redundant confirmation. See the error-handling guide.
{
"type": "https://docs.vocapable.com/errors/export_too_large",
"title": "…",
"status": 422,
"detail": "…",
"instance": "/v1/…"
}