Andrei Pozolotin Andrei-Pozolotin

	--- session=0 ---
	count=100000 time_diff=2.300 time_unit=23 micro
	--- session=1 ---
	count=100000 time_diff=2.262 time_unit=22 micro
	--- session=2 ---
	count=100000 time_diff=2.145 time_unit=21 micro

	--- session=0 ---
	count=100000 time_diff=0.179 time_unit=1 micro
	--- session=1 ---
	count=100000 time_diff=0.168 time_unit=1 micro
	--- session=2 ---
	count=100000 time_diff=0.168 time_unit=1 micro

	"""
	robust cluster connection pool
	"""

	import asyncio
	import logging
	from contextvars import ContextVar
	from typing import Awaitable
	from typing import List
	from typing import Mapping

	"""
	"""

	import tester
	import logging

	from logging.config import fileConfig

	from sqlalchemy import pool
	from sqlalchemy import engine_from_config

	//
	// https://github.com/bogde/HX711
	//
	// sensor setup:
	// * 5V supply (from nano)
	// * 128 gain (library config)
	// * +-20 mV input range (derived from gain)
	// * int32_t output range (library convention)
	// * 80 Hz (12.5 ms) sample rate (jumper on board)
	//