How to massive update/upload postcodes?

I would like to upload/update many “osm_id” by adding/correcting Postal Codes of Italy but I can’t manually update 2milions records of ways, nodes and relations…

Is there a way to do it in a somehow fastest/batched way?
I can do/test it locally on my own server by doing massive UPDATE Queries directly on the database, but for official Online Database is there a way?

Thx in advance.

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