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A declined answer left one number behind and it was in a log line, so confidence_min could not be tuned from data. route_decisions.confidence cannot say it either: the chat path re-routes through the override branch, which hard-codes 1.0, and 43,804 of 43,856 live rows hold exactly that. Measured on 2026-10-04 under local_decision (qwen3.5:4b): 769 of 2,557 turns (30%) had no fresh classification, against 0% for local_llm and local_encoder. The cause was recorded in only 4 of them. - classifier_confidence, classifier_coverage and classifier_reject on route_decisions, filled from a ClassifierAttempt carried on Classification. Both accepted and declined answers carry one, so the two distributions can be compared around the floor. Reason codes are listed in docs/data-model.md. - ClassifierRejected (a RuntimeError subclass, messages unchanged) replaces the plain RuntimeErrors at the six floor-miss sites and the two local_decision refusals, so the number and reason travel out of the raise site. - The chat path captures the classifier's verdict before the re-route and passes it to persist_route_decision (attempt_of), like it already does for source. - Admin decisions page: the source badge's tooltip shows the attempt, and session_history / session_stale get an amber badge instead of neutral grey. TUI detail popup and the live event carry the same three keys. - The /metrics degraded-share warning lists the recorded reasons instead of claiming the classifier "has been failing", which was wrong for a classifier that answers and is declined. - degraded_warn_threshold must be in (0, 1] and degraded_warn_min at least 1, refused at load: a value above 1 could never fire. The three columns arrive by ALTER and are NULL on every earlier row; metrics selects them only when present, so the live DB reads NULL until its restart. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01KkCGRantZsSwmcFpet6FTa
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