-`REDIRECT_URIS` this should be `APP_WEBSITE + "/users/OAuth2_login/"` . It can be multiple urls separated by `\n` , but not all Fediverse software support it well. Also note changing this later may invalidate app token granted previously
-`SEARCH_BACKEND` should be either `TYPESENSE` or `MEILISEARCH` so that search and index can function. `None` will use default database search, which is for development only and may gets deprecated soon.