pallet-mmr: fix offchain db for sync from zero (#12498)
* pallet-mmr: cosmetic improvements * pallet-mmr: fix offchain storage for initial sync * address review comments * pallet-mmr: change offchain fork-resistant key to `(prefix, pos, parent_hash)` Do this so that both canon and fork-resitant keys have the same `(prefix, pos).encode()` prefix. Might be useful in the future if we'd be able to to "get" offchain db entries using key prefixes as well. Signed-off-by: acatangiu <[email protected]> Signed-off-by: acatangiu <[email protected]>
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