* Change order of object Manager declarations in the GeneratedCertificate model. Declaration order matters and It appears that having the "base" `objects` declaration after the other Custom Managers creates an issue where I cannot access `objects` in a migration without this change.
* As part of the manager migration there is a cleanup function that resets the `error_reason` field to an empty string for all certificates in the `downloadable` state that currently have an error listed in the record.
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