revert removal of polkadot migration

runtime/polkadot/src/lib.rs

@@ -31,7 +31,7 @@ use authority_discovery_primitives::AuthorityId as AuthorityDiscoveryId;
 use beefy_primitives::crypto::AuthorityId as BeefyId;
 use frame_support::{
 	construct_runtime, parameter_types,
-	traits::{Contains, KeyOwnerProofSystem, LockIdentifier},
+	traits::{Contains, KeyOwnerProofSystem, LockIdentifier, OnRuntimeUpgrade},
 	weights::Weight,
 	PalletId, RuntimeDebug,
 };
@@ -1126,11 +1126,22 @@ pub type Executive = frame_executive::Executive<
 	frame_system::ChainContext<Runtime>,
 	Runtime,
 	AllPallets,
-	(),
+	MigratePalletVersionToStorageVersion,
 >;
 /// The payload being signed in transactions.
 pub type SignedPayload = generic::SignedPayload<Call, SignedExtra>;
 
+/// Migrate from `PalletVersion` to the new `StorageVersion`
+pub struct MigratePalletVersionToStorageVersion;
+
+impl OnRuntimeUpgrade for MigratePalletVersionToStorageVersion {
+	fn on_runtime_upgrade() -> frame_support::weights::Weight {
+		frame_support::migrations::migrate_from_pallet_version_to_storage_version::<
+			AllPalletsWithSystem,
+		>(&RocksDbWeight::get())
+	}
+}
+
 #[cfg(not(feature = "disable-runtime-api"))]
 sp_api::impl_runtime_apis! {
 	impl sp_api::Core<Block> for Runtime {