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A filter whose entries have all been deleted from the board was the one failure mode of this app that was completely invisible: the workflow kept running, kept updating last_run and matched nothing, forever. It happens with deleted labels and just as easily when a filtered user loses board access, because Deck's BoardService::deleteAcl() calls assignedUsersMapper->deleteByParticipantOnBoard() and wipes that user's card assignments. Two low-stakes signals, no new column and no migration: - WorkflowRunner::warnAboutDeadFilters() logs a warning on every run. - workflowIssues in PersonalSettings.vue marks the row red. Deliberately no mail and no `enabled = false`. One deleted label out of three is harmless, and even a fully dead filter can be one board edit away from being live again. Both obey the rule the disable path already follows: only positive knowledge. DeckIntegrationService::findFilterOptions() therefore throws instead of degrading to [], unlike listLabels()/listParticipants(), where an empty list only means an empty dropdown. That also fixes an existing false positive of the same family: loadStacksFor() stored [] when the request failed, so a single failed fetch reported "Quell-Stapel und Ziel-Stapel nicht mehr vorhanden" for an untouched board. Failed requests now store null and are read as "unknown". The comparison itself lives in WorkflowRunner::findDeadFilters(), static and side-effect free like cardMatchesFilters(), with unit tests -- notably that an empty filter is never dead, which would otherwise flag every unfiltered workflow. Separately, the moved-card mail now names the board and both stacks. DeckIntegrationService::describeTargets() resolves the titles at most once per workflow run, and only when a card actually moved and the workflow wants a mail; unreadable titles degrade to #<id> rather than costing the user their notification.