title: There are no pending changes for EF migration and still it complains that there are pending changes. How does EF keep track of this?
body: <p>I have several migration files in my project and since I made manual modifications to my last migration I don't want to re-generate it with the "package manager console". I only need to add 1 column. So Added this manually a previous migration (I can do this since no-one has upgraded yet).</p>
  
  <p>Now, when I start my project, the local database seems to create my new column fine but I do get an exception:
  "Unable to update database to match the current model because there are pending changes and automatic migration is disabled"</p>
  
  <p>It looks like the only way I can solve this is to generate an extra migration - even though, this migation generates exactly the same line of code that i wrote manually in a previous migration...</p>
  
  <p>I was wondering - how does EF keep track of this and is there a way to bypass it ? </p>
  
  <p>Also another question - is it wrong of me to want to limit the amount of migration files that I have ? I currently feel that in an ideal situation each Release of my software should only have 1 migration file at most in order to keep a better overview of my code...</p>
  
  <p>thank you,</p>