The restore flow accepted an unvalidated database.backup_file from
the manifest (absolute paths and traversal both worked, and no
containment check enforced the configured backup root), then
interpolated it unescaped into a `sqlite3 .restore '<path>'` command,
letting an attacker-chosen source file replace the live database.
Co-authored-by: Paul Nothaft <paul@MacStudio-von-Paul.local>
Paul Nothaft