Sep 2026· Zenodo (CERN European Organization for Nuclear Research)
Abstract
Class-connectivity queries can no longer cache a zero that was really an outage. _aggregate_class_connectivity used to return [] when a Neo4j or Solr call it depends on failed, and that became {'count': 0} — stored by the Solr result cache and pinned for a month at the v3-cached edge, which is how gamma Kenyon cell downstream connectivity showed "There is no data to display" on 2026-09-04 with 3,886 rows in the backend. Backend failures in the class-connectivity family now raise ConnectivityBackendError; ha_api answers 5xx and no cache layer stores it. True zeros are unchanged. A result computed with some instances' connectivity missing is tagged partial: served, never stored in the Solr result cache, kept at the edge for 600 s (VFBQUERY_PARTIAL_EDGE_TTL). /run_query now sends X-Accel-Expires: 0 + Cache-Control: no-store on any empty result, so the nginx edge never stores an empty body. No owl_cache change needed. #111
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