cleanups

lib/db_revision.py

@@ -255,7 +255,7 @@ class DBRevision:
         self._files.sort(key=lambda x: x["name"])
         return self._files
 
-    def calc_delta(self, current_rev: Optional[DBRevision]):
+    def calc_delta(self, current_rev: DBRevision | None):
         """Calculate the list of files to download and to delete.
         Param current_rev is the revision that's currently checked out.
         If it's None, the repository is empty.