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@tt4g `core.h` header is in the commit, but after building the fmt library and installing it with make or cmake, it's not available in fmt folder.  and regarding `fmt.h`,...
@tt4g `spdlog/fmt/fmt.h` is installed. yes. but when I'm builing spdlog with external fmt, I still the same error.
I did. After a few hundred records read from Mongo, it failed again with the same error. BTW, all `PassedTime` values are greater than zero (`0`). P.S. How does nlohmann::json...
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