Check whether a NOT NULL check constraint has been validated

Hello,

I have several NOT NULL check constraints in my schema that were originally
added as NOT VALID. I would like to determine whether they have all since
been validated, or not.

I thought maybe pg_constraint.convalidated might help, but it seems like
the version of Postgres I'm using (16) doesn't store not null constraints
in that table. And even in later versions, maybe it doesn't hold the
information I need.

Is there another way to discover this?

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