[AHM] Preimage migration

[ggwpez]

👉 To be merged into the AHM dev branch.

quote from Preimage.md:

The preimage pallet consists of three storage maps, one of which is a legacy item. The interesting one are RequestStatusFor and PreimageFor.

Storage: PreimageFor

Maps a hash and the length of a preimage to its preimage data. Preimages can be migrated rather easily by sending them in chunks from the Relay and appending them on the Asset Hub. The preimages are often used to store large governance calls.

Q: One question here would be whether or not we want to translate these calls. I think we can and should. But I am not sure about the best time point to do so.
We can translate the preimages calls upon arrival on the Asset Hub, although there is a small chance that a preimage that was not intended to be decoded as a call would be translated.
After all, the preimage pallet is a universal data storage without any implied semantics about its content. It could therefore be better to translate the preimages once we are migrating the Referenda pallet and then only translate all preimages that occur as hash lookups in a referenda. However, since the scheduler is the only way to request a preimage, all requested preimages should probably be valid calls. But the translation still needs to happen in accord with the Referenda pallet as to not invalidate its hashes.

Basically: loop referenda -> load referenda -> load preimage of referenda -> translate preimage -> calculate new preimage hash -> update preimage with new hash -> update referenda with new hash.

One further note on the preimage translation: If the length of a preimage is increased by the translation, then we should not reconsider the deposit but keep the original deposit as to not punish users for this. The cases that the translation increases the size of a preimage past the 4MiB hard limit should be negligible.

Storage: RequestStatusFor

This maps preimage hashes to RequestStatus. The RequestStatus contains a consideration that will be re-considered upon import. This would unreserve funds for all users that noted preimages. Possible up to 20 DOT per preimage.
The migration of this should be straighforward this but we need to remember that it must be updated if we start translating preimage calls.

Storage: StatusFor

Deprecated. Will not be migrated but funds will be unreserved.

User Impact

For anyone who has registered a preimage:

• If the preimage was in the new RequestStatusFor: Some unlocked funds 😎. We cannot calculate a list of affected accounts in advance since users can still influence this.
• If the preimage was in the old StatusFor: will be removed and funds unlocked. Exhaustive list of all 166 Polkadot accounts that are affected by this and will have UP TO these funds unlocked (not a legally binding statement):

Details

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• Does not require a CHANGELOG entry