Criteria for Identity?

Hi,
I’m not getting an identity returned after inserting a record.

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My ID field is a uuid (created from a custom formatter). It’s database field is user_id (in this instance). After insert I have a single query to retrieve the user just created by identity. The database insert is created fine.

How does Wappler know the identity column to return and is there something in the insert above that stops it from being able to retrieve it?

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Thanks!