If you want encryption then someone has to have the key, otherwise you won't be able to decrypt the

If you want encryption then someone has to have the key, otherwise you won't be able to decrypt the data. You could in theory add a secret in your worker and "lose it" so that it's only in the worker dashboard, but then if you ever need to put that into a different worker, or decrypt the data outside of that worker you cannot do anything, so do NOT do this.
You could infer keys from something unique to each user that they anyway provide into your application, as an alternative.
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