[Django]-Django Redis appends same annotaion on key

This is actually part of the Django cache API. Specifically, the cache backend transforms the key with a cache prefix (in your case, the empty string) and a version number (in your case, 1).

The former allows servers to use a namespace to control collisions if they share the same cache backend, and the latter allows you to use versioning to avoid having to flush the database when you change the format of your cached data.