What is the method for verifying the existence of pending migrations while utilizing SQLAlchemy/Alembic?

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The method for verifying the existence of pending migrations while utilizing SQLAlchemy/Alembic is to use the following command:

alembic current

This command will display the current revision for the database and the latest revision available in the migrations folder. If there are any pending migrations, it will show the list of revisions that need to be applied to the database.

Another command that can be used to check for pending migrations is:

alembic upgrade --sql $(alembic current) head

This command will generate the SQL statements necessary to apply all pending migrations. If there are no pending migrations, it will generate an empty SQL script.