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The run died with HTTP 400 and eight "The provided RRN: [...] is invalid", every one a plain UUID. Two mistakes compounded. The alert list under an investigation is not consistent about where the RRN sits. On the ABA alert this work was built against, `id` held the RRN. On others it holds a bare UUID. The code read `id` first and `rrn` only as a fallback, so it picked the UUID whenever both were present. Worse, the failure was total rather than partial. /alerts/ops/rrns validates the whole list and rejects the entire request when one entry is malformed, so a single bad identifier costs every alert in that batch — and with one batch, the whole run. An investigation feed that stops dead because one alert is shaped differently is not an acceptable failure mode. So: read `rrn` first, and drop anything that is not RRN-shaped before the batch is sent, counting it as alert_ids_without_rrn in the run metadata. The investigation still arrives, its retrievable alerts still arrive, and what could not be fetched is a number an operator can see rather than an absence nobody would notice. Both commands that walk this list are fixed; the selector is shared and was checked against the two real shapes plus the empty and null cases. This turns a total failure into a partial one. It does NOT establish that those eight alerts are reachable at all: if they carry no RRN anywhere, they are not in the Alert Triage system and no field_ids or batch call will produce them. That needs the raw shape of one, which the next run of list_investigation_alerts on the failing investigation will show. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>