Profiling support

[Yaraslaut]

Consider adding specific option for the build, to query what is the timing and amount of queries in some scope, for instance i want to measure how many queries i fired during some function call, and would like to see the timings for them as well as queries itself

[christianparpart]

That's what I initially planned with the trace logging. We already log individual sql query times. And we have a scoped logger as well.