How is the process of creating migration scripts implemented in Alembic?

In Alembic, the process of creating migration scripts usually consists of the following steps:

1. Initializing Alembic — a directory with configuration files and migration templates is created (command alembic init).

2. Automatic migration creation — when models in SQLAlchemy are changed, a migration script can be generated with the command:

alembic revision --autogenerate -m "description of changes"

Alembic compares the current models with the database state and generates a script with the necessary changes.

3. Manual editing of migrations — sometimes automatic generation does not cover all cases, so scripts can be manually edited.

4. Applying migrations — the command alembic upgrade head applies all new migrations to the database.

Thus, creating migration scripts in Alembic involves generating with revision --autogenerate and subsequent review/editing before applying.