the relevant data is in the [your_table_prefix]_usermeta table stored with a meta key of wppizza_rewards_x (where ‘x’ is your blogid – typically 1 if it’s not a multisite setup) associated to the user id .
it’s a serialized array

that will look *something like* this – depending on your settings:

(
    [points] => Array
        (
            [first_order] => Array
                (
                    [timestamp] => 1643293592
                    [points_expire] => 1674829592
                    [value_per_point] => 0.01
                    [points_total] => 250
                    [points_value] => 2.5
                    [points_redeemed] => Array
                        (
                        )

                    [points_unredeemed] => 250
                    [points_value_unredeemed] => 2.5
                    [settings] => Array
                        (
                            [points_type] => cart_subtotal
                            [points_per_unit] => 1
                            [points_per_unit_pickup] => 0
                            [points_rounding] => natural
                            [value_per_point] => 0.01
                            [award_points_user_registration] => 125
                            [award_points_first_order] => 250
                            [points_expire_days] => 365
                        )

                )

            [order_7] => Array
                (
                    [timestamp] => 1643293592
                    [points_expire] => 1674829592
                    [value_per_point] => 0.01
............. more data ................

i suppose you could amend the point total and related (points (un)redeemed, (un)redeemed value etc ) for the “first_order” array but I would strongly advise you to make a backup first before doing anything there – it’s entirely at your own risk editing this. This thing is not really that trivial