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Turning Spoolman mode on ran an unfiltered delete(SpoolAssignment) across every printer. Turning it straight back off cleared the other table instead, so the two directions were symmetric in code and one-way in effect, and the setting auto-saves on a 500 ms debounce with no save button and no confirmation. Opening the settings page to see what the option did was enough to destroy the configuration: the reporter's log shows four toggles in 85 seconds, which is someone looking and reverting, and the assignments never came back. The deletion was not careless. Checks that read both assignment tables would otherwise let a row in the mode you are not using answer for the mode you are, which is how #1473 was fixed, and emptying the inactive table made that impossible by construction. The cost was that the guarantee was bought with the user's data. That decision belongs to the readers -- the mode is a property of the install, not of the rows -- so spoolman_owns_assignments now answers it and nothing is deleted on a toggle. Each mode keeps its own assignments and switching is reversible. Existing installs need no migration: their inactive table is already empty, because it was being emptied. Six sites had to be told which mode they meant, and only two of them are the reads you would guess at, the missing-assignment notification and the queue cost estimate. The per-slot K-profile lookup consults the built-in table first and, on a hit with no matching profile, deliberately stops rather than falling through to Spoolman, so a leftover row would have shadowed the Spoolman binding for that slot -- the symptom #1556 reported from the other direction. configure_ams_slot *writes* a K-profile against whichever table answers first, so the same leftover would have filed a calibration against a spool the printer is not drawing on and never written the local one, leaving a calibration that appeared to succeed and then did not apply. The auto-unlink pass in on_ams_change is the one that would have made this change worthless. It drops any assignment whose tray no longer matches the fingerprint it recorded, and it ends in db.delete. Ungated, it would have removed the preserved rows one slot at a time as the AMS contents changed under the other mode -- the same loss, arriving slowly enough not to be connected to the toggle that caused it. The sixth is the built-in remaining-weight fallback inside the Spoolman AMS sync, and it is deliberately left inert rather than woken up. It could never fire while the table it reads was being emptied, it is keyed by slot rather than by spool, and create_spool writes remaining_weight unconditionally where the update path does not -- so preserving the rows would have seeded a stale figure into a brand new Spoolman spool the first time a tray reported an unusable remain%. The query stays, gated off, so the intent survives for whoever revisits the cross-mode fallback. Separately, a print that could not debit a spool said nothing about it, and that is what turned a mis-click into lost filament. The reporter's print was already running when they toggled. At completion it resolved its 3MF, read its per-filament grams, resolved its tray, and then skipped the debit because the assignment row no longer existed -- logged at INFO, invisible under the default log level, while the completion notification fired as usual. 65.49 g was never deducted and they only noticed because a spool's remaining weight looked wrong. _resolve_spool_id_for_tray has no tag or fingerprint fallback, so there was nothing else to catch it. The skip is now a warning naming the grams, and a completed print that failed to charge a tray it drew from raises the missing-spool-assignment notification. The print-start check cannot cover this and was right to stay quiet: the assignments existed when it ran. The two are different statements -- the first says the weight may not be tracked, the second says it was not -- so a print warned at start will notify twice, which is the right trade. Collected across the print rather than fired per slot, and given the caller's session, because this runs inside on_print_complete's transaction and opening a second one to read the printer's name would deadlock against it on SQLite. This is independent of the toggle and catches any other cause of an assignment disappearing mid-print.