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Maybe it will be simpler to serialise all the data in a more compact data format, such as avro (its readme is in here), a row based format that seems to be able to use zstd/bzip/xz.
Shameless self-plug: You could have a look at https://github.com/heremaps/flatdata to see if it fits your needs: Read-only memory mapped flat data structures providing fast random access.
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