Is it possible to store the alembic connect string outside of alembic.ini?

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I had the very same problem yesterday and found a following solution to work.
I do the following in alembic/env.py:

# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config

# this will overwrite the ini-file sqlalchemy.url path
# with the path given in the config of the main code
import config as ems_config
config.set_main_option('sqlalchemy.url', ems_config.config.get('sql', 'database'))

ems_config is an external module that holds my configuration data.

config.set_main_option(...) essentially overwrites the sqlalchemy.url key in the [alembic] section of the alembic.ini file. In my configuration I simply leave it black.

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