Explore parallelizing transform-gisaid #448
Description
Originally proposed by @corneliusroemer in #446 (comment)
How hard is it to parallelize ~4h - transform-gisaid?
As this operates on ndjson lines, it might be parallelizable, or at least some part of it.
The obvious way to do so would be to have a split rule to divide input files into N chunks, run transform, and merge back.