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Nothing tied a library file to the queue rows pointing at it, and the FK that describes the relationship is ON DELETE CASCADE -- which SQLite does not enforce and PostgreSQL does. So the same fault had two faces: rows left pointing at a file that no longer existed, failing at the printer with "Library file not found" days later, or rows deleted outright with no error and no history. Two routes into it, both fixed by taking the queue off the file before the row goes. Dispatch (the reported case): quantity>1 on the printer-card upload-and-print flow puts cleanup_library_after_dispatch on every copy, and _clone_queue_item copies library_file_id onto batch clones, so the first dispatch consumed the file the rest were waiting on. The copies are now pointed at the archive that dispatch just created -- it holds its own copy of the 3MF -- and the consume flag is cleared on them. A copy already printing from its own archive keeps it, a finished one keeps its outcome, and a cross-model item (#671) keeps any candidate this does not consume. Deletion: the File Manager, bulk delete, folder delete, emptying the trash and the retention sweeper all removed rows with queued work against them. Folder delete did not even clear the cross-model candidates, because the file-id walk it already performs threw its result away. Jobs waiting on a deleted file are now cancelled at that moment, naming the file, and every other row referring to it is detached rather than destroyed -- print history and batch progress are counted from those rows. A job that is printing is left alone: what is deleted is the library copy, not the copy on the machine. The trash is reversible so it still changes nothing about the queue, and a job dispatched while its file is in the trash now says so instead of "not found". Verified row for row on PostgreSQL 16 as well as SQLite: without this, PostgreSQL deletes every queue row referencing the file.