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chore: cache query misses to protect against DDoS (#6771)

## About the changes
This PR establishes a simple yet effective mechanism to avoid DDoS
against our DB while also protecting against memory leaks.

This will enable us to release the flag `queryMissingTokens` to make our
token validation consistent across different nodes

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Co-authored-by: Nuno Góis <github@nunogois.com>

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