feat(bookings): allow cancelling booking confirmations

Add API endpoint to revert confirmed bookings to pending status
Add unconfirm buttons to the bookings list and confirmation page
Update inventory summary when a confirmation is cancelled

server/utils/booking-repository.ts

@@ -859,3 +859,30 @@ export async function confirmBookingByConfirmationToken(confirmationToken: strin
 
   return await getBookingByConfirmationToken(confirmationToken)
 }
+
+export async function cancelBookingConfirmationByConfirmationToken(confirmationToken: string): Promise<PublicBooking | null> {
+  await ensureDatabaseReady()
+  const sql = getSqlClient()
+
+  const [row] = await sql<DbBookingRow[]>`
+    with updated_booking as (
+      update bookings
+      set
+        status = 'pending',
+        confirmed_at = null,
+        updated_at = now()
+      where confirmation_token = ${confirmationToken}
+        and status = 'confirmed'
+      returning *
+    )
+    select ${bookingSelectColumns(sql)}
+    from updated_booking as bookings
+    ${bookingJoins(sql)}
+  `
+
+  if (row) {
+    return mapBooking(row)
+  }
+
+  return await getBookingByConfirmationToken(confirmationToken)
+}