As others have said, injecting fabricated data into prod wont give you any value. The only reason to test in prod these theys are to try your new feature on data with the breadth and level of detail that prod data has that you can never fabricate. (Hardware differences between prod and other envs really should not be a problem these days).

In almost every case you cannot test new functionality on actual prod data, at least not anything thats not strictly “read only”-functionality. If you have a new feature to send automated mail to someone foreclosing on their property you just do not test that on a real live system.

What you can do is setup a staging environment that is as close to prod config as possible, and then copy the prod database to the staging env. Do your tests in staging. It doesnt matter if data in stg is messed ud. There may well be legal or company policy or security restrictions preventing you from doing this, but its the only way to test on real life data without the risk of f**ing up data in the live system.

Then there are integration tests - to other systems that is, which are a much harder problem