title: Does RDS Instance Actually Exist within Subnet Group?
body: <p>I accidentally had an RDS instance associated with a subnet group in the wrong tier of subnets. I then changed the subnet group to include the correct subnets. I expected the instance to have to re-create itself since it was in the wrong subnet. I was surprised when it didn't have to, and the new subnet rules seem to have worked fine. </p>
  
  <p>This leads me to question if the instance actually exists with the subnets of the subnet group, as I can't see how it could change to entirely new subnets without re-deploying. Am I missing something here? </p>