Hi Enrico Hofmann, Welcome to our discuss forum.
You can do without losing any data.
From:
<Rating_rates>: UID @reverse .
To:
<Rating_rates>: [UID] @reverse .
``
But for doing reverse you have you first drop the predicate , which will delete all data.
I guess you want to only keep latest value, let me check if there is way to do that.