Type Definition pallet_referenda::pallet::MetadataOf

pub type MetadataOf<T: Config<I>, I: 'static = ()> = StorageMap<_GeneratedPrefixForStorageMetadataOf<T, I>, Blake2_128Concat, ReferendumIndex, PreimageHash>;

The metadata is a general information concerning the referendum. The PreimageHash refers to the preimage of the Preimages provider which can be a JSON dump or IPFS hash of a JSON file.

Consider a garbage collection for a metadata of finished referendums to unrequest (remove) large preimages.

Storage type is StorageMap with key type ReferendumIndex and value type PreimageHash.