Struggling with real-time country code data validation for our tool?

hey everyone, we recently launched our 'Country Codes Directory' tool, which is basically an international phone, calling, dialing, and ISO codes reference. it's been pretty well received, but we're hitting a wall with maintaining absolute data consistency and real-time updates for what is essentially critical reference data.

the deep technical block for us is around efficient, low-latency data validation. we're dealing with a large dataset that changes surprisingly frequently – think new country codes, changes in dialing prefixes, ISO updates, etc. the challenge is how to reconcile multiple external authoritative sources without introducing significant latency or, worse, temporary inconsistencies for our users. we've got internal integrity checks, but syncing those with external APIs and ensuring our internal database always reflects the absolute latest, validated state without over-fetching or hitting rate limits is proving tricky. we're trying to avoid a situation where our internal validation logic gets out of sync with what's actually current globally.

i'm curious if anyone here has tackled similar problems with robust real-time reference data validation in large-scale web tools? what architectural patterns, caching strategies (maybe a distributed cache with TTLs tied to source update frequencies?), or specific technologies have you found effective for managing this kind of dynamic, high-integrity data? any insights on how to build a resilient validation pipeline for international codes would be super helpful. thanks in advance!