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maziggy
58ea7a360d
print_archives.library_file_id -> library_files.folder_id -> library_folders.archive_id -> print_archives. Three nullable SET NULL links, each reasonable alone, that together made a loop metadata.sorted_tables could not sort: it dropped those edges, warned on every backup and every restore, and could return an order placing a child before its parent -- which once imported library_files ahead of library_folders and killed a restore on a ForeignKeyViolation. The restore no longer depends on that order (it strips every foreign key before importing and adds them back after), but the backup export sorts the same way, and the warning ends with "may raise an error in a future release" -- which would break backup and restore on one upgrade. Marking one edge use_alter removes it from the sort graph, not from the database: PostgreSQL emits it as ALTER TABLE ADD CONSTRAINT, as it already did for every constraint on these three tables, and SQLite inlines it into CREATE TABLE, so ON DELETE SET NULL holds on both. Verified against PostgreSQL 16 and SQLite.
