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By default, rails makes timestamp columns (`created_at` and `updated_at`) non-nullable, we also have some required core and plugins columns we wouldn't necessarily want to enforce in the intermediate DB schema. It'll be better to set the default values for these during import instead of enforcing these at the converter level. This change adds support for globally modifying a column’s `nullable` state, defaulting all `created_at` columns to be `nullable` while allowing for table level overrides. --------- Co-authored-by: Gerhard Schlager <gerhard.schlager@discourse.org>