Hi all.
I recall talks about sqlite-backed HLR being bottleneck and that it should be replaced with something more decent.
As far as I recall that idea is not materialized yet so I'd like to bring new db buzz-word I've stumbled upon recently: http://www.aerospike.com/press-releases/aerospike-open-sources-visionary-dat...
If you remove all the marketing junk it's essentially greatly revamped AlchemyDB with AGPL license for server (various language bindings for client library under apache license), transactions and claim for very-small latencies (approx 5 ms!) which grabbed my attention.
It's unlikely that I'll be able to allocate time to work on that ATM but maybe it'll spark interest in someone else :)