[Answer]-Mezzanine: where is the database created by `manage.py createdb`

You didn’t find the LucidDB in postgres because it wasn’t created, you need to create it with the postgres shell see here for detailed description.
Faking a migration is marking it as complete without actually changing the database schema, it will simply add an entry in the migrationhistory database, see detailed description here.
On the Mezzanine docs it is stated that createdb is a shortcut for syncdb and migrate commands, see here for detailed description.

Hope this helps!

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