This can be in any language, even PHP if the programmer is comfortable with it. Someone doesn’t need to be a Discourse expert or even a Ruby/Rails expert. This is just an automated task, not a full-fledged web app. They would only need to know Discourse’s API, its endpoints and how to work the PostgreSQL database. Also curl.
We have a marketplace category here on Meta. There’s other places where you can post a bounty too such as Bountify.
EDIT: Maybe not even Discourse’s API. Just the ability to query the PostgreSQL database.