text: import os
  import sys
  import asyncio
  import debugpy
  
  from sqlalchemy import engine_from_config
  from sqlalchemy import pool
  from sqlalchemy.ext.asyncio import AsyncEngine
  from sqlalchemy.ext.asyncio import create_async_engine
  
  from alembic import context
  from alembic.config import Config
  
  # debugpy.listen(5678)
  # print("Waiting for debugger attach")
  # debugpy.wait_for_client()
  # debugpy.breakpoint()
  # print('break on this line')
  # print("==== start alembic ==")
  
  # https://stackoverflow.com/a/66772223/6652082
  if sys.platform.startswith("win"):
      asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
  
  
  sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
  sys.path.append(
      os.path.dirname(
          os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
      )
  )
  
  from app.models.base import Base
  from app import create_app
  
  try:
      config = context.config  # noqa
  except Exception:
      ini_path = os.path.join(
          os.path.dirname(os.path.abspath(__file__)), "../alembic.ini"
      )
      ini_path = os.path.abspath(ini_path)
      config = Config(ini_path)
  
  # add your model's MetaData object here
  # for 'autogenerate' support
  # from myapp import mymodel
  # target_metadata = mymodel.Base.metadata
  target_metadata = None
  
  # other values from the config, defined by the needs of env.py,
  # can be acquired:
  # my_important_option = config.get_main_option("my_important_option")
  # ... etc.
  
  # https://gist.github.com/utek/6163250
  def exclude_tables_from_config(config_):
      tables_ = config_.get("tables", None)
      if tables_ is not None:
          tables = tables_.split(",")
      else:
          tables = []
      new_tables = []
      for table in tables:
          table = table.strip()
          new_tables.append(table)
      return new_tables
  
  
  # [alembic:exclude]
  # table_col = products.create_at, users.updated_at
  def exclude_colum_from_config(config_):
      columns_ = config_.get("table_col")
      if columns_ is not None:
          columns = columns_.split(",")
      else:
          columns = []
      new_columns = []
      for column in columns:
          column = column.strip()
          new_columns.append(column)
      return new_columns
  
  
  exclude_tables = exclude_tables_from_config(
      config.get_section("alembic:exclude")
  )
  exclude_table_cols = exclude_colum_from_config(
      config.get_section("alembic:exclude")
  )
  
  
  def include_object(object, name, type_, *args, **kwargs):
      ret_table = not (type_ == "table" and name in exclude_tables)
      ret_col = not (type_ == "column" and name in exclude_table_cols)
      return ret_table and ret_col
  
  
  application = create_app(os.getenv("FASTAPI_CONFIG") or "default")
  target_metadata = Base.metadata
  
  
  def get_url():
      global application
      url = application.config["DATABASE_URI"]
      return url
  
  
  def run_migrations_offline():
      """Run migrations in 'offline' mode.
  
      This configures the context with just a URL
      and not an Engine, though an Engine is acceptable
      here as well.  By skipping the Engine creation
      we don't even need a DBAPI to be available.
  
      Calls to context.execute() here emit the given string to the
      script output.
  
      """
      print("offline mode")
      global configure
      url = get_url()
      context.configure(
          url=url,
          target_metadata=target_metadata,
          literal_binds=True,
          include_object=include_object,
          dialect_opts={"paramstyle": "named"},
      )
  
      with context.begin_transaction():
          context.run_migrations()
  
  
  def do_run_migrations(connection):
      context.configure(
          connection=connection,
          target_metadata=target_metadata,
          include_object=include_object,
      )
  
      with context.begin_transaction():
          context.run_migrations()
  
  
  async 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.
  
      """
      print("online mode")
      url = get_url()
      # connectable = AsyncEngine(
      #     engine_from_config(
      #         config,
      #         url=url,
      #         prefix="sqlalchemy.",
      #         poolclass=pool.NullPool,
      #         future=True,
      #     )
      # )
      connectable = create_async_engine(url, future=True, echo=True)
  
      async with connectable.connect() as connection:
          await connection.run_sync(do_run_migrations)
  
  
  if __name__ == "__main__":
      # run_migrations_offline()
      asyncio.run(run_migrations_online())
  else:
      if context.is_offline_mode():
          run_migrations_offline()
      else:
          asyncio.run(run_migrations_online())
  
  print("==== end alembic ==")
  