Authorization Reversal Holds

When a card is authorized, the issuer places a hold on the cardholder's funds until the merchant captures or reverses it. Process a list of events, each [type, auth_id, card, amount], in order:

• "auth": add amount to the open hold of authorization auth_id, which belongs to card. The first "auth" for an id opens it with a hold of 0 before adding; later "auth" events for the same id (incremental authorizations) add to the same hold.
• "reversal" or "capture": reduce the open hold of auth_id by amount. A hold never goes below 0; any excess is ignored.
• A "reversal" or "capture" for an auth_id that has not been opened by an earlier "auth" is ignored.

All events for the same auth_id carry the same card. A card can have several authorizations.

Return a list of [card, total_open_hold] rows, one per card that appeared in at least one "auth" event, where total_open_hold is the sum of the final holds of all its authorizations. Sort rows by card ascending. Cards whose total is 0 are still included.