code: def run_migrations_online():
      """Run migrations in 'online' mode.
  
      In this scenario we need to create an Engine
      and associate a connection with the context.
  
      """
      sqlalchemy_url = os.environ.get("AIM_RUN_META_DATA_DB_URL")
      connectable = create_engine(sqlalchemy_url)
  
      with connectable.connect() as connection:
          context.configure(
              connection=connection, target_metadata=target_metadata
          )
  
          with context.begin_transaction():
              context.run_migrations()
  
file_path: aim/aim/storage/migrations/env.py
imports: import os
  from logging.config import fileConfig
  from sqlalchemy import create_engine
  from alembic import context
  from alembic.config import Config
  from aim.web.configs import AIM_ENV_MODE_KEY
  from aim.storage.structured.sql_engine.models import *
  from aim.storage.structured.db import DB
label_desc: Use image node_id 2 for calling a global function with example usage: run_migrations_online() without return types