Alembic is a database migrations tool written by the author of SQLAlchemy. A
migrations tool offers the following functionality:
• Can emit ALTER statements to a database in order to change the structure of
tables and other constructs
• Provides a system whereby "migration scripts" may be constructed; each script
indicates a particular series of steps that can "upgrade" a target database
to a new version, and optionally a series of steps that can "downgrade"
similarly, doing the same steps in reverse.
• Allows the scripts to execute in some sequential manner.
Documentation and status of Alembic is at https://alembic.sqlalchemy.org/
