A bit background - we have a 0.13.55 daml app running on postgre database and our users have been doing some testings on it . We tried to upgrade it to 1.2.0 but found that the postgre database cannot be upgraded. To work with the old data schema, we can only run 1.2.0 sandbox using daml sandbox-classic.
Anyone can share some tips on how to move the data in 0.13.55 database to 1.2.0 database? Thanks.