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There are several steps you can take to prevent Symfony Migrations Bundle from generating duplicate migrations repeatedly:

1. Always use the --no-interaction option: When running the migration command, use the --no-interaction option to prevent the migration generator from prompting you for a new migration name. This will ensure that each migration has a unique name.

2. Use version control: Ensure that your project is using version control (such as Git) and that you are committing your migrations after generating them. This will allow you to keep track of which migrations have already been generated, and prevent the generator from creating duplicates.

3. Check for existing migrations: Before generating a new migration, check to see if a migration with a similar name already exists. You can do this by running the command: php bin/console doctrine:migrations:status. This will show you a list of all the migrations in your project and their status.

4. Avoid renaming migrations: Once you have generated a migration, avoid renaming it. Renaming a migration can cause issues downstream and may confuse the migration generator.

By following these steps, you can prevent Symfony Migrations Bundle from generating duplicate migrations repeatedly.