Registration and fixes

sql/get_folders.sql

@@ -5,7 +5,7 @@ SELECT
     created_at
 FROM
     folders f
-    JOIN permissions p ON f.folder_id = p.folder_id
+    LEFT JOIN permissions p ON f.folder_id = p.folder_id
 WHERE
     parent_folder_id = $1
-    AND p.user_id = $2
+    AND (p.user_id = $2 OR f.owner_id = $2)