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they sell a database optimization service that happens to support PostgreSQL (and other databases like MySQL)

A ML program that automatically tunes your production database in real-time. What could possibly go wrong?

We are very careful to make sure that we don't allow the tuning algorithms to make changes that could be detrimental to the correctness or availability of the database. This blog article describes some of the safeguards that we employ:

https://ottertune.com/blog/prevent-machine-learning-from-wre...

We also advise our customers to not point OtterTune at a production database right away.

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