From 21a12d182d08ad0b61e18cb493909e24c0302aca Mon Sep 17 00:00:00 2001
From: giuseppere <giuseppe.re@parity.io>
Date: Wed, 18 Dec 2024 14:41:59 +0100
Subject: [PATCH] Fix PR title in prdoc and migrations for old deprecated
 storage items

---
 prdoc/pr_6445.prdoc                       |  9 ++-------
 substrate/frame/staking/src/migrations.rs | 24 +++++++++++++++++++++++
 2 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/prdoc/pr_6445.prdoc b/prdoc/pr_6445.prdoc
index 79e3e6b7b034..36bb6d00fac2 100644
--- a/prdoc/pr_6445.prdoc
+++ b/prdoc/pr_6445.prdoc
@@ -1,4 +1,4 @@
-title: Add storage bounds for pallet `staking`
+title: Add storage bounds for pallet `staking` and clean up deprecated non paged exposure storages
 doc:
 - audience: Runtime Dev
   description: |-
@@ -17,18 +17,13 @@ doc:
         - Completing the task from #5986
     - Use `MaxExposurePageSize` to bound  `ErasStakersPaged` mapping to exposure pages: each `ExposurePage.others` Vec is turned into a `WeakBoundedVec` to allow easy and quick changes to this bound
     - Add `MaxBondedEras` to bound `BondedEras` Vec -> `BoundedVec`
-        - Set to `BondingDuration::get() + 1` everywhere to include both time interval endpoints in [`current_era - BondingDuration::get()`, `current_era`]
+        - Set to `BondingDuration::get() + 1` everywhere to include both time interval endpoints in [`current_era - BondingDuration::get()`, `current_era`]. Notice that this was done manually in every test and runtime.
     - Add `MaxRewardPagesPerValidator` to bound `ClaimedRewards` Vec of pages -> `WeakBoundedVec`
         - Set to constant 20 in the pallet. The vector of pages is now a `WeakBoundedVec` to allow easy and quick changes to this parameter
     - Remove `MaxValidatorsCount` optional storage item to add `MaxValidatorsCount` mandatory config parameter
         -  Using it to to bound `EraRewardPoints.individual` BTreeMap -> `BoundedBTreeMap`;
         -  Set to dynamic parameter in runtime westend so that changing it should not require migrations for it
 
-    **TO DO**
-    Slashing storage items will be bounded in another PR.
-
-    - `UnappliedSlashes`
-    - `SlashingSpans`
 crates:
 - name: pallet-staking
   bump: major
diff --git a/substrate/frame/staking/src/migrations.rs b/substrate/frame/staking/src/migrations.rs
index 35de7b429f30..7c66f629ce5e 100644
--- a/substrate/frame/staking/src/migrations.rs
+++ b/substrate/frame/staking/src/migrations.rs
@@ -71,6 +71,8 @@ pub mod v17 {
 			let mut migration_errors = false;
 
 			v16::MaxValidatorsCount::<T>::kill();
+			v16::ErasStakers::<T>::kill();
+			v16::ErasStakersClipped::<T>::kill();
 
 			let old_disabled_validators = v16::DisabledValidators::<T>::get();
 			// BoundedVec with MaxDisabledValidators limit, this should always work
@@ -254,6 +256,28 @@ pub mod v16 {
 	#[frame_support::storage_alias]
 	pub(crate) type MaxValidatorsCount<T: Config> = StorageValue<Pallet<T>, u32, OptionQuery>;
 
+	#[frame_support::storage_alias]
+	pub(crate) type ErasStakers<T: Config> = StorageDoubleMap<
+		Pallet<T>,
+		Twox64Concat,
+		EraIndex,
+		Twox64Concat,
+		<T as frame_system::Config>::AccountId,
+		Exposure<<T as frame_system::Config>::AccountId, BalanceOf<T>>,
+		ValueQuery,
+	>;
+
+	#[frame_support::storage_alias]
+	pub(crate) type ErasStakersClipped<T: Config> = StorageDoubleMap<
+		Pallet<T>,
+		Twox64Concat,
+		EraIndex,
+		Twox64Concat,
+		<T as frame_system::Config>::AccountId,
+		Exposure<<T as frame_system::Config>::AccountId, BalanceOf<T>>,
+		ValueQuery,
+	>;
+
 	pub struct VersionUncheckedMigrateV15ToV16<T>(core::marker::PhantomData<T>);
 	impl<T: Config> UncheckedOnRuntimeUpgrade for VersionUncheckedMigrateV15ToV16<T> {
 		#[cfg(feature = "try-runtime")]