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  • from logging.config import fileConfig
    
    from alembic import context
    from sqlalchemy import create_engine
    
    from clowm.core.config import settings
    from clowm.db.base import Base
    
    # this is the Alembic Config object, which provides
    # access to the values within the .ini file in use.
    config = context.config
    
    # Interpret the config file for Python logging.
    # This line sets up loggers basically.
    if config.config_file_name is not None:
        fileConfig(config.config_file_name)
    
    # add your model's MetaData object here
    # for 'autogenerate' support
    target_metadata = Base.metadata
    
    # 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.
    
    
    def run_migrations_offline() -> None:
        """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.
    
        """
        url = str(settings.db.dsn_sync)
        context.configure(
            url=url,
            target_metadata=target_metadata,
            literal_binds=True,
            dialect_opts={"paramstyle": "named"},
        )
    
        with context.begin_transaction():
            context.run_migrations()
    
    
    def run_migrations_online() -> None:
        """Run migrations in 'online' mode.
    
        In this scenario we need to create an Engine
        and associate a connection with the context.
    
        """
        connectable = create_engine(str(settings.db.dsn_sync), pool_pre_ping=True, pool_recycle=3600, echo=False)
    
        with connectable.connect() as connection:
            context.configure(connection=connection, target_metadata=target_metadata)
    
            with context.begin_transaction():
                context.run_migrations()
    
    
    if context.is_offline_mode():
        run_migrations_offline()
    else:
        run_migrations_online()