I have a query returning:

name | product_id
Bob | 1
Bob | 2
Charles | 1
Charles | 4

To make it compatible with a legacy app, I need to convert it to this form:
name | product_ids
Bob | "1,2"
Charles | "1,4"

(Before you jump "That's not normal!" - I know.  I didn't write the
app.  I just need to meet its interface.)

What's the best way to do this in Postgres? Is there a way to do it
via pure SQL?

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