I suspect most of check-ins are happening in big cities such as NYC, SF etc. So some sort of "geo-based sharding" would be more helpful. Also I recommend givin

I suspect most of check-ins are happening in big cities such as NYC, SF etc. So some sort of "geo-based sharding" would be more helpful. Also I recommend giving @naveen a separate shard. The guy just keeps roaming around in the city. Thank you.