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This data often (in the case of inventory updates) represents large data blobs (5+MB per job run). Storing it on the polymorphic base class table, `main_unifiedjob`, causes it to be automatically fetched on every query (and every polymorphic join) against that table, which can result in _very_ poor performance for awx across the board. Django offers `defer()`, but it's quite complicated to sprinkle this everywhere (and easy to get wrong/introduce side effects related to our RBAC and usage of polymorphism). This change moves the field definition to a separate unmanaged model (which references the same underlying `main_unifiedjob` table) and adds a proxy for fetching the data as needed see https://github.com/ansible/awx/issues/200