title: Symfony 4: how to safely 'join' migrations together? / remove migrations in between the first and last?
body: <p>I was recently tweaking around with my DB and noticed that I made 5 migrations on top of my existing 2. So 7 in total, m1, m2, ..., m7. From these 5, I only want the latest version. So I was thinking I could remove m3, m4, m5, m6, m7 and migrate again, which will result in m3 that already contains the final version that I'm happy with. Now I have never done this before and was wondering what is the safest way to do it? </p>
  
  <p>I'm using PHPStorm. Could I manually remove them (right click in PHPStorm then Delete) and then go to the command line and do <code>php bin/console doctrine:migrations:migrate</code>? Or do I need to do <code>php bin/console doctrine:schema:update</code>? Or is this really a bad idea?</p>