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- Add maxKeys limit (10,000) to NodeCache to prevent unbounded memory growth - Skip caching undefined values when GeoIP/ASN lookups fail (e.g., when MaxMind DB not configured) - Add periodic cache statistics logging every 5 minutes for monitoring - Fixes memory leak where cache would grow indefinitely with high request volumes The maxKeys limit uses LRU eviction, so oldest entries are automatically removed when the limit is reached. With ~10k requests/day and 5min TTL, 10k keys provides ample headroom while preventing OOM issues. Fixes #2120