feat: remove deposit in case zero coins

x/deposit/keeper/deposit.go

@@ -14,6 +14,12 @@ func (k *Keeper) SetDeposit(ctx sdk.Context, deposit v1.Deposit) {
 		panic(err)
 	}
 
+	deposit.Coins = sdk.NewCoins(deposit.Coins...)
+	if deposit.Coins.IsZero() {
+		k.DeleteDeposit(ctx, addr)
+		return
+	}
+
 	store := k.Store(ctx)
 	key := types.DepositKey(addr)
 	value := k.cdc.MustMarshal(&deposit)
@@ -53,6 +59,14 @@ func (k *Keeper) GetDeposits(ctx sdk.Context) (items v1.Deposits) {
 	return items
 }
 
+// DeleteDeposit removes a deposit from the module's KVStore based on the address.
+func (k *Keeper) DeleteDeposit(ctx sdk.Context, addr sdk.AccAddress) {
+	store := k.Store(ctx)
+	key := types.DepositKey(addr)
+
+	store.Delete(key)
+}
+
 // IterateDeposits iterates over all deposits stored in the module's KVStore and calls the provided function for each deposit.
 // The iteration stops when the provided function returns 'true'.
 func (k *Keeper) IterateDeposits(ctx sdk.Context, fn func(index int, item v1.Deposit) (stop bool)) {