move files into folders

backend/internal/db/queries/files.sql

@@ -5,7 +5,7 @@ WHERE id = $1 LIMIT 1;
 -- name: ListFiles :many
 SELECT * FROM files
 WHERE parent_file_id IS NULL
-ORDER BY created_at DESC;
+ORDER BY is_folder DESC, created_at DESC;
 
 -- name: ListFolders :many
 SELECT * FROM files
@@ -32,6 +32,11 @@ SELECT * FROM files
 WHERE parent_file_id = $1
 ORDER BY is_folder DESC, created_at DESC;
 
+-- name: MoveFiles :exec
+UPDATE files
+SET parent_file_id = $1, updated_at = CURRENT_TIMESTAMP
+WHERE id = ANY($2::text[]);
+
 -- name: UpdateFile :exec
 UPDATE files
 SET name = $1, mime_type = $2, ocr_text = $3, updated_at = CURRENT_TIMESTAMP