Modifying some contents in History

Hello,

We have users they have mentioned confidential information in RT.
Now I need just to anonymize these information in the Ticket History.

I’ve identified the transaction Id and now I how can I decode et re-encode the Content value located in the Attributes table

Example :

ConfidentialData  --> xxxxxxxxxx




Our config :

-      RT 4.2.12

-      MySQL



Thanks in advance for your help.
Horst


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