diff --git a/pallets/migrations/src/democracy_preimages.rs b/pallets/migrations/src/democracy_preimages.rs
deleted file mode 100644
index 47cb39a..0000000
--- a/pallets/migrations/src/democracy_preimages.rs
+++ /dev/null
@@ -1,192 +0,0 @@
-// Copyright Moonsong Labs
-// This file is part of Moonkit.
-
-// Moonkit is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-
-// Moonkit is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with Moonkit.  If not, see <http://www.gnu.org/licenses/>.
-
-use {
-	super::Error,
-	frame_support::{
-		pallet_prelude::*,
-		traits::{Currency, PalletInfo, StorageInstance},
-	},
-	frame_system::{pallet_prelude::*, Config as SystemConfig},
-	pallet_democracy::Config as DemocracyConfig,
-	pallet_preimage::{Config as PreimageConfig, RequestStatus},
-	parity_scale_codec::Input,
-	sp_std::prelude::*,
-};
-
-/// Maximum size of preimage we can store is 4mb.
-pub const MAX_SIZE: u32 = 4 * 1024 * 1024;
-
-pub type BalanceOf<T> = <<T as pallet_democracy::Config>::Currency as Currency<
-	<T as frame_system::Config>::AccountId,
->>::Balance;
-
-#[derive(Clone, Encode, Decode, RuntimeDebug, TypeInfo)]
-pub enum PreimageStatus<AccountId, Balance, BlockNumber> {
-	/// The preimage is imminently needed at the argument.
-	Missing(BlockNumber),
-	/// The preimage is available.
-	Available {
-		data: Vec<u8>,
-		provider: AccountId,
-		deposit: Balance,
-		since: BlockNumber,
-		/// None if it's not imminent.
-		expiry: Option<BlockNumber>,
-	},
-}
-
-// ---- Old storage ----
-
-pub struct DeprecatedDemocracyPreimagesPrefix<T>(PhantomData<T>);
-
-impl<T: DemocracyConfig> StorageInstance for DeprecatedDemocracyPreimagesPrefix<T> {
-	const STORAGE_PREFIX: &'static str = "Preimages";
-
-	fn pallet_prefix() -> &'static str {
-		T::PalletInfo::name::<pallet_democracy::Pallet<T>>()
-			.expect("there is pallet democracy installed")
-	}
-}
-
-/// Storage entry for preimages once stored in pallet_democracy.
-pub(crate) type DeprecatedDemocracyPreimages<T> = StorageMap<
-	DeprecatedDemocracyPreimagesPrefix<T>,
-	Identity,
-	<T as SystemConfig>::Hash,
-	PreimageStatus<<T as SystemConfig>::AccountId, BalanceOf<T>, <T as SystemConfig>::BlockNumber>,
->;
-
-// ---- New storage ----
-
-pub struct StatusForPrefix<T>(PhantomData<T>);
-
-impl<T: PreimageConfig> StorageInstance for StatusForPrefix<T> {
-	const STORAGE_PREFIX: &'static str = "StatusFor";
-
-	fn pallet_prefix() -> &'static str {
-		T::PalletInfo::name::<pallet_preimage::Pallet<T>>()
-			.expect("there is pallet preimage installed")
-	}
-}
-
-pub(crate) type StatusFor<T> = StorageMap<
-	StatusForPrefix<T>,
-	Identity,
-	<T as SystemConfig>::Hash,
-	RequestStatus<<T as SystemConfig>::AccountId, BalanceOf<T>>,
->;
-
-pub struct PreimageForPrefix<T>(PhantomData<T>);
-
-impl<T: PreimageConfig> StorageInstance for PreimageForPrefix<T> {
-	const STORAGE_PREFIX: &'static str = "PreimageFor";
-
-	fn pallet_prefix() -> &'static str {
-		T::PalletInfo::name::<pallet_preimage::Pallet<T>>()
-			.expect("there is pallet preimage installed")
-	}
-}
-
-pub(crate) type PreimageFor<T> = StorageMap<
-	PreimageForPrefix<T>,
-	Identity,
-	(<T as SystemConfig>::Hash, u32),
-	BoundedVec<u8, ConstU32<MAX_SIZE>>,
->;
-
-// ---- Call ----
-
-impl<T: super::Config> super::Pallet<T> {
-	pub(crate) fn migrate_democracy_preimage_inner(
-		origin: OriginFor<T>,
-		proposal_hash: T::Hash,
-		proposal_len_upper_bound: u32,
-	) -> DispatchResultWithPostInfo {
-		let _who = ensure_signed(origin);
-
-		// Check that this hash doesn't already exist in the new storage.
-		ensure!(
-			!StatusFor::<T>::contains_key(proposal_hash),
-			Error::<T>::PreimageAlreadyExists,
-		);
-
-		// Check bound is correct.
-		ensure!(
-			Self::pre_image_data_len(proposal_hash)? <= proposal_len_upper_bound,
-			Error::<T>::WrongUpperBound,
-		);
-
-		// Get the old preimage data.
-		let (data, provider, deposit) = <DeprecatedDemocracyPreimages<T>>::get(&proposal_hash)
-			.and_then(|m| match m {
-				PreimageStatus::Available {
-					data,
-					provider,
-					deposit,
-					..
-				} => Some((data, provider, deposit)),
-				_ => None,
-			})
-			.ok_or(Error::<T>::PreimageMissing)?;
-
-		// Insert data in new storages.
-		let data: BoundedVec<_, _> = data.try_into().map_err(|_| Error::<T>::PreimageIsTooBig)?;
-
-		let request_status = RequestStatus::Unrequested {
-			deposit: (provider, deposit),
-			len: data.len() as u32,
-		};
-
-		StatusFor::<T>::insert(proposal_hash, request_status);
-		PreimageFor::<T>::insert((proposal_hash, data.len() as u32), data);
-
-		// Clean old storage.
-		<DeprecatedDemocracyPreimages<T>>::remove(&proposal_hash);
-
-		Ok(().into())
-	}
-
-	fn pre_image_data_len(proposal_hash: T::Hash) -> Result<u32, DispatchError> {
-		// To decode the `data` field of Available variant we need:
-		// * one byte for the variant
-		// * at most 5 bytes to decode a `Compact<u32>`
-		let mut buf = [0u8; 6];
-		let key = <DeprecatedDemocracyPreimages<T>>::hashed_key_for(proposal_hash);
-		let bytes = sp_io::storage::read(&key, &mut buf, 0).ok_or(Error::<T>::PreimageMissing)?;
-		// The value may be smaller that 6 bytes.
-		let mut input = &buf[0..buf.len().min(bytes as usize)];
-
-		match input.read_byte() {
-			Ok(1) => (), // Check that input exists and is second variant.
-			Ok(0) => return Err(Error::<T>::PreimageMissing.into()),
-			_ => {
-				sp_runtime::print("Failed to decode `PreimageStatus` variant");
-				return Err(Error::<T>::PreimageMissing.into());
-			}
-		}
-
-		// Decode the length of the vector.
-		let len = parity_scale_codec::Compact::<u32>::decode(&mut input)
-			.map_err(|_| {
-				sp_runtime::print("Failed to decode `PreimageStatus` variant");
-				DispatchError::from(Error::<T>::PreimageMissing)
-			})?
-			.0;
-
-		Ok(len)
-	}
-}