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A Database-wide 'System' auto-number attribute already exists (it is guaranteed to be unique within an Info Database).
You can see it by setting the ItemID system attribute to display @ Tools | Options | Attributes.
Of course this won't start with 1 at each indent of the Data Explorer Pane, but will increment chronologically.
There is another system 'auto-number' attribute that does start at 0 for each indent level (that currently can't be displayed) but it only gets populated when the children of an Info Item are manually sorted (in the Data Explorer Pane or Search Pane). Would this be helpful? If so we can look at exposing this as a new System attribute.
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