When updating the tags for a dag for upper-case to lower-case the scheduler give the following info and the Dag does not appear on the UI.

sqlalchemy.exc.PendingRollbackError: This Session's transaction has been rolled back due to a previous exception during flush. To begin a new transaction with this Session, first issue Session.rollback(). Original exception was: (MySQLdb._exceptions.IntegrityError) (1062, "Duplicate entry 'pacman-Campaign-711_PRD-1671' for key 'dag_tag.PRIMARY'") [parameters: (('pacman', 'Campaign-711_PRD-1671'), ('pu', 'Campaign-711_PRD-1671'))]