perf: suppression de répertoire incrémentale au lieu du re-scan complet #BUG-113

backend/routers/files_write.py

@@ -532,9 +532,10 @@ async def api_directory_delete(
     result = service_delete_directory(vault_name, path, recursive=True)
     file_count = result["deleted_count"]
 
-    # Update index
-    from backend.indexer import reload_single_vault
-    await reload_single_vault(vault_name)
+    # Update index — incremental subtree removal (no full vault re-scan, no
+    # global inverted-index rebuild).
+    from backend.indexer import remove_directory_from_index
+    await remove_directory_from_index(vault_name, result["path"])
 
     # Broadcast SSE event
     await sse_manager.broadcast("directory_deleted", {