The raw-SQL prefix rewrite from f4a03b6 used
`SUBSTRING(filepath FROM LENGTH(:old_prefix) + 1)`. asyncpg's type
inference miscategorises the LENGTH() result and rejects the
parameter as "$2: int (expected str)" at execute time, so every
directory-rename webhook 500'd in production despite the surrounding
logic being correct.
Switch to the same per-row Python loop the existing PATCH
/api/v1/folders/{id} endpoint already uses. Folder renames are rare
and span ≤1k photos typically — the cost of N row UPDATEs is fine.
End-to-end verified:
RenameTestA -> RenameTestA-FromNC (WebDAV MOVE outside mule):
nc-webhook renamed (dir): {photos: 2, folders: 2, source_roots: 0}
DB rows now at -FromNC ✓
-FromNC -> -ViaMule (PATCH /folders/{id} inside mule):
mule rewrites synchronously
webhook fires back ~30s later
nc-webhook renamed (dir): {photos: 0, folders: 0, source_roots: 0}
idempotent no-op against an already-updated DB ✓
f27f3cb820