This would really be a job for a processor. Even though there is no such processor yet, we have have been discussing designing one in the past. Or possibly a nice job for anyone from the community?
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Also waiting for @Martin Fiser111 to chime in but I do believe the processor is the way to go here (as yes, the data would land in the docker container unencrypted, but only encrypted data would then go to SAPI to be saved while the container ceases to exist).