Closes G9.
DELETE on a folder now flips is_trashed on every descendant folder
and file under it in a single CTE pipeline (lpath <@ root.lpath
covers the whole subtree via the GiST index). Previously only the
root row was flipped — descendants stayed live, directly addressable
via their full path, and confused desktop-sync tree walks that
expected the parent-collection 404 to imply the children were gone
too.
restore_from_trash mirrors the cascade: descendants where the
original_*_parent_id column is NULL are the ones we cascade-trashed,
so they get cascade-restored too. Descendants that were independently
trashed before the parent went to trash have original_*_parent_id
set, so they stay in trash and remain visible as top-level entries
in storage.trash_items.
No schema migration needed — both original_parent_id (folders) and
original_folder_id (files) were already nullable and already encoded
'where this came from when it was independently trashed'; using NULL
as the cascade-marker reuses that existing distinction cleanly.
Test G9 flipped from KNOWN BUG to assert every descendant 404s after
the parent DELETE; new G9b proves the inverse cascade by restoring
the trashed root and verifying every descendant comes back at its
original path.
Closes G4 / G5 / K5.
handle_move now resolves the destination once before the file/folder
dispatch and applies RFC 4918 §9.9.4:
- Overwrite: F on a collision → 412 Precondition Failed, source
untouched, destination untouched.
- Overwrite: T (or absent) on a collision → delete the existing
destination, then proceed → 204 No Content.
- No collision → 201 Created (unchanged).
The same destination lookup powers the 201-vs-204 status decision, so
adding the precondition guard adds zero extra DB hits on the happy
path.
handle_restore now catches the unique-index collision out of
restore_item and returns 412 instead of letting it bubble as 500.
Mirrors the G4 semantics for the trashbin surface (restore has no
Overwrite header so the refusal is unconditional; client resolves by
renaming the live file first).
Sabre/DAV's CorePlugin and our test pins agreed independently — NC
clients expect this exact behavior, and the new G5b/G5c positive-case
tests guard against a regression that hard-rejected every MOVE.
Edouard Vanbelle