Hi @smurray
You would have to dig around in your application database to find the references. Have a look at Metabase Metadata SQL for some examples of general queries.
But it’s likely going to be very difficult, since if someone has created a question that queries a full table, then all columns are included - even if the user might not be looking at or interested in some of the columns.
Think the best thing you can do is to talk with everyone and figure out how you want your data looking from now on.
Hiding columns in Data Model should not break existing questions.
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