Migrate Changes from a Staging Site to Production

Note: This is more a comment than an answer, but I wanted to format it nicely.

I don’t know about recording, but I imagine something like the following in SQL could work.

INSERT INTO         DB1.Tbl1 ( id, x, y )
  SELECT            DB2.Tbl1.id, DB2.Tbl1.x, DB2.Tbl1.y
    FROM            DB2.Tbl1  
  ON DUPLICATE KEY  
    UPDATE          x=x, y=y;

Beware, this is completely untested. You have to test it and read up on the documentation yourself.