andrijapanicsb commented on issue #3892: Add if not exists constraint to create table on upgrade paths URL: https://github.com/apache/cloudstack/pull/3892#issuecomment-587892895 To further explain myself - if you attempt the upgrade on top of DB which previously failed to be upgraded, you might end up with duplicate entries trying to be inserted and that would be chaos. The only "normal" way (acceptable in production) to proceed with the failed upgrade, is to start clean (drop DB, restore DB) and try again.
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