code: def build_storage():
      """Build storage from scratch"""
      null_db_instances()
      return experiment_builder.setup_storage()
  
imports: import os
  import shutil
  import subprocess
  import pytest
  from pymongo import MongoClient
  import orion.core.cli
  import orion.core.io.experiment_builder
  from orion.client import create_experiment
  from orion.core.io.database import database_factory
  from orion.storage.base import storage_factory
label_desc: Use image node_id 15 for calling a global function with example usage: build_storage() and returns: experiment_builder