keon94 commented on issue #2440:
URL: 
https://github.com/apache/incubator-devlake/issues/2440#issuecomment-1177849028

   If they decide not to drop their data then they can get in this split-brain 
state where the server code (devlake) is on the new version, but the existing 
data is old. So queries to the DB can end up throwing errors on server side 
because of Nils, or other deserialization problems.


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