`aUST` is not migratable

[tkowalczyk]

How are going to deal with Columbus-5 when smart contract of aUST is not migratable?
https://finder.terra.money/columbus-4/address/terra1hzh9vpxhsk8253se0vv5jj6etdvxu3nv8z07zu

[yun-yeo]

The columbus-5 migration is using code migration, which will be introduced as new feature for hardfork.
All contract code uploader can use this feature to upgrade one's code to latest CosmWasm compatible version.

This operation can be executed only once only from the contract code uploader after hardfork.
https://github.com/terra-money/core/blob/7ed34ed945fb0cb54d6d5fdcb23f959a95435952/x/wasm/types/msgs.go#L13