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I have an "updated_at" attribute in a PostgreSQL table updated by a trigger, so I just want to read this attribute but I want to ignore it when writing an entry via Exposed. One solution would be having two classes, one read model and one write model. However, is there a solution with Exposed to exclude a non-nullable field when it comes to inserting data?

You could define some default value if your trigger changes value just after insert.

Thanks for your answer, your suggestion is perfectly valid. However I opted for having two different models: ReadModel and WriteModel as for me it felt a bit strange writing a value to database and having it overwritten by trigger.