custom database perf

watch progress of core at `docker logs -f 09837b0d2288126ca6d4bf0aef915664337c8a5bb69d9e7c62f790ff506ae721`

   info | parallelism set to 200
   info | prefix uri set to http://core:8080/v1/Z777F5BE
  debug | starting tests
   info | discovering containers
>> bash | docker ps -a | grep performance | awk -F " " '{ print $2,$1 }'
          73 ms
   info | found transaction_core(1x)
  debug | waiting util services are UP
   info | start tests
  debug | reference test of http API
   info | preparing creation of 100 health check spams
   info | sending 100 requests
   pass | all passed                                                      
          699 ms ... 6 ms per unit
  debug | random accounts from scratch with random transactions
   info | preparing creation of 3332 accounts
   info | sending 3332 requests
   pass | all passed                                                      
          11 sec 572 ms  ... 3 ms per unit
   info | preparing creation of 18846 transactions with 1661 debit and 1671 credit accounts
   info | sending 18846 requests
   pass | all passed                                                      
          7 sec 755 ms  ... 2 ms per unit
   info | checking that sum of all balances is 0.0
   pass | all balances cancels out
          1 ms
  debug | reset core / verify rehydration
>> bash | docker container restart 09837b0d2288 2> /dev/null || :
          74 ms
  debug | waiting util service is ready
   info | preparing checking balance of 3332 accounts
   info | sending 3332 requests
   pass | all passed                                                      
          8 sec 442 ms  ... 2 ms per unit
  debug | ending tests


deleting core container 09837b0d2288126ca6d4bf0aef915664337c8a5bb69d9e7c62f790ff506ae721
deleting localfs volume 
deleting test container 09837b0d2288126ca6d4bf0aef915664337c8a5bb69d9e7c62f790ff506ae721