In-memory tree build (single SELECT + JS nesting); the folder tree is
small enough that a recursive CTE buys nothing. Sibling-name conflict
maps the Postgres unique-index 23505 to a typed ConflictError so the
UI can render a clean toast. Cross-port parentId rejected at the
service boundary. Also adds document_folders to the global teardown
CTE so test ports can be cleaned up without FK violations.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Matt
4b31f01a04