Donut Auction

Improvements

• Sell confirmation now uses atomic pending-sale transactions with unique IDs so an item is owned by only one state at a time (inventory, pending sale, or active auction)
• Confirm, cancel, inventory close, disconnect, and shutdown recovery are idempotent against double-clicks, lag, and repeated callbacks
• Cancel and collect actions on existing auctions use operation locks to prevent double item returns
• Failed listing validation now safely restores the item (with ground drop if the inventory is full)
• Added sampled debug logging for invalid/repeated pending-sale claims (debug.pending-sales)

Bug Fixes

• Fixed item duplication when cancelling /ah sell confirmation (Cancel, GUI close, duration/category re-open, double-click, or disconnect could return the item more than once)
• Pending sell items are now returned correctly on player quit and server shutdown

Configuration

• debug.pending-sales (default: false) — when true, logs every invalid/repeated pending-sale claim; when false, samples only