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Daily builds since 889c8bd8 (Apr 29) silently destroyed archive copies
and library file bytes on every print completion. Reprint / View G-code
later returned 404 with no log line explaining why; the DB row was
intact and the archive grid kept showing the entry, but the file
behind archive.file_path no longer existed on disk.
Root cause: #1166 added three dispatch sites that cache the live
archive copy (and library file bytes for Direct-Print) in the shared
3MF download cache, so /cover could skip a redundant FTP transfer
mid-print. The cache was originally designed for transient downloads
under archive_dir/temp/, and clear_3mf_cache(printer_id) — called
from on_print_complete to keep that temp dir from accumulating —
happily unlink()'d every cached path. Path.exists() guarded the
unlink, so no exception, no warning, just silent destruction. Listing
didn't change; only acting on the archive surfaced the 404.
Fix: clear_3mf_cache._maybe_unlink refuses to unlink any path outside
archive_dir/temp. Cache dict is still cleared (so re-cache continues
to work and /cover hits a fresh path next print), only the on-disk
delete is gated. Persistent locations — archive/<printer_id>/...,
archive/unassigned/... (VP-archived prints with printer_id=None),
library_files/..., is_external library mounts — all survive.
Regression test test_clear_does_not_delete_persistent_files pins the
contract end-to-end: archive 3mf, library 3mf, and temp 3mf all
cached for the same printer; after clear, all three cache entries
are dropped from the dict, but only the temp file is unlinked from
disk. Two existing tests updated to put fixtures under
archive_dir/temp.