Drop auction_orders Table

database/sql/V113__drop_auction_orders.sql

@@ -0,0 +1,6 @@
+-- Drop the redundant `auction_orders` junction table. Its data duplicated
+-- `competition_auctions.order_uids`; the order->auction lookup now uses the GIN
+-- index on that array (V112). The write path was removed in #4568, so this drop
+-- ships one release later to ensure no pod running the old code still writes to
+-- the table during the rollover.
+DROP TABLE IF EXISTS auction_orders;