set lease start on auction finalization

x/cosmostest/keeper/auction_state.go

@@ -69,6 +69,9 @@ func (k Keeper) FinalizeExpiredAuctions(ctx sdk.Context) {
 				}
 			}
 
+			// lease period starts now
+			auction.LeaseStart = uint64(ctx.BlockTime().Unix())
+
 			// end auction
 			k.SetAuction(ctx, auction)
 		}

x/cosmostest/keeper/msg_server_new_auction.go

@@ -32,7 +32,9 @@ func (k msgServer) NewAuction(goCtx context.Context, msg *types.MsgNewAuction) (
 		Denom:    msg.Denom,
 		Owner:    msg.Creator,
 		Ceiling:  msg.Ceiling,
-		LeaseStart: uint64(ctx.BlockTime().Unix()),
+		// lease start -> null
+		// instead, initialize when auction is finalized
+		// LeaseStart: uint64(ctx.BlockTime().Unix()),
 		LeaseEnd: msg.LeaseEnd,
 		// remaining payout -> null
 		// Remaining:  "0",