analytics_window_unbounded
start and end are both required. A window is never defaulted: guessing one for a report that costs partition scans would hide the cost from the caller.
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/analytics_window_unbounded",
"title": "…",
"status": 400,
"detail": "…",
"instance": "/v1/…"
}