title: Create a database migration to be applied before existing migrations (Yii 2)
body: <p>When creating migrations in the Yii 2 framework they have a timestamp. I want to create a migration, which should be executed before the other existing migrations. When using the create tool this isn't possible. Is there a safe way to create a new migration which will be executed before all other migrations?</p>
  
  <p>What I want to achieve is to create an initial migration that sets up the database. It has to be applied before all other migrations but it cannot because it will have a later time stamp.</p>