Add Ability to add updated/inserted time to UPSERT recipe

kevinr9

The new upsert recipe is great, and has alot of potential.

It would be awesome to have the ability to add an audit column to this recipe, updated_at if the row was updated, or created_at if its a new row.

If its a new row, updated_at would be left blank, created_at would be now()
if an update, updated_at would be now(), created_at would remain unchanged.