fix: improve perf of _maybe_filter_foreign_keys method #667
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Optimizing a method to try and address the issue described here -> #665
A bit of a shot in the dark, but this optimization should help significantly. Unclear if it will address the memory-related issue, would have to dig deeper in the call stack to understand what it does.
I have to admit I don't actually understand what the code does, so this optimization is purely theoretical.