code: def get_main_database() -> Database:
      db_uri = current_app.config["SQLALCHEMY_DATABASE_URI"]
      return get_or_create_db("main", db_uri)
  
file_path: superset/superset/utils/database.py
imports: from __future__ import annotations
  import logging
  from typing import TYPE_CHECKING
  from flask import current_app
  from superset.constants import EXAMPLES_DB_UUID
label_desc: Use image node_id 3 for calling a global function with example usage: get_main_database() and returns: get_or_create_db