Dear @vagudets
From my side, the first version of this module is finished. I know there are many potential developments. For instance, the module doesn't work for future forecasts right now. However, new developments can be included in the future, while I think this is a good starting point.
I have run the unit tests and all were successful. I have been able to get all indices for decadal and seasonal hindcasts.
There are examples of recipes and the suite execution.
Please, let me know if I should do something else.
Thanks for all the help you provided to make this development.
Núria