Remove memory leak caused by accountCache, count batch size in bytes (#565)

* Lower cache sizes

* Add memory profiling over http

* No code cache

* Calculate db batch size in bytes

* Fixes

* Fixes

* Increase batch

* Fix linter

* Restore account caching, with copying

* Reintroduce code cache

* Add fixed overhead per key

* Print batch size

* Fix batch size

* Reduce batch size

* 50 Mb

* Fix linter