title: Update foreign keys on relationship when primary key changes
body: <p>Let's say I have two tables in MySQL: Branch and Banker</p>
  
  <p>Branch contains PK called ID and Banker has a FK for a branch he belongs to.</p>
  
  <p>Can I change Branch'es ID and have Banker's branch ID change with that?</p>
  
  <p>I want Banker to stay with the branch when I change the PK.</p>