feat(core): node rows name their parent by local id

Schema 40 adds nodes.parent_lid, backfilled from parent_uid. An upsert
and a new row's stub keep it in step, a folder's new row links the rows
stored before it, and a row merged into a landing folder hands its
children over. A restart places each node under its parent's row as it
is now, so a child whose stored node still names a landed folder's
placeholder lands under the folder's real uid.

docs/CHANGELOG.md

@@ -11,9 +11,10 @@ scratch (user data in `staging/` and `recovery/` is never touched by this).
 
 ## [Unreleased]
 
-Schema: **39**. The queue table is rebuilt so an id is never given out twice; queued changes
+Schema: **40**. The queue table is rebuilt so an id is never given out twice; queued changes
 are kept. Queued changes get a column for the reason Drive refused them, and name their file
-and folder by local id as well as by Drive's id.
+and folder by local id as well as by Drive's id. Stored files and folders name their parent
+folder by local id too.
 
 ### Added
 - **Sync issues.** A change Drive refuses because the storage is full, access was taken away,