https://dba.stackexchange.com/questions/333660/orientdb-wont-start-after-upgrade-cannot-create-user-guest-role-guest-does-no rm -rf OPAL_HOME/data/orientdb/opal-config/databases/OSystem/
https://dba.stackexchange.com/questions/333660/orientdb-wont-start-after-upgrade-cannot-create-user-guest-role-guest-does-no rm -rf OPAL_HOME/data/orientdb/opal-config/databases/OSystem/