upgrader 26 (1.0 ->1.0)

previous job: Create and run on example DB used 1 day Found problem: error msg of no-unique is not clear need to fix no-unique names improve standard upgrader to create/remove not-null constraint automatically reupgrade example db (est: 0.5day) transfer data from applicationdata to experiment (est: 0.5 day) Done in X2 reasons: (1) lack real testing data (2) the unchangeable role is not predicted (3)can not fully focus on this