ripoul commented on issue #5333: my model definition and table created don't match URL: https://github.com/apache/incubator-superset/issues/5333#issuecomment-402621109 after I correct the problem, I migrate ("superset db migrate") : it works and generates a migration file. but when I upgrade the db ("superset db upgrade") I have the following error : "sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) near "ALTER": syntax error [SQL: 'ALTER TABLE clusters ALTER COLUMN changed_on DROP NOT NULL']"
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