Begin Block

At the start of each block, auctions that have reached EndTime are closed. The logic to close auctions is as follows:

var expiredAuctions []uint64
    k.IterateAuctionsByTime(ctx, ctx.BlockTime(), func(id uint64) bool {
        expiredAuctions = append(expiredAuctions, id)
        return false
    })

    for _, id := range expiredAuctions {
        err := k.CloseAuction(ctx, id)
        if err != nil {
            panic(err)
        }
  }