Add migration to fix coretime state (#458)

The `LeaseOffset` was not taken into consideration in the [Polkadot
migration](https://github.com/polkadot-fellows/runtimes/blob/e6b9132701df4311e7d6331e3a9e051ae8de0104/relay/polkadot/src/lib.rs#L1965)
that ran when [ref 1143](https://polkadot.subsquare.io/referenda/1143)
enacted and upgraded the relay chain, so the end timeslices of the
leases are short by about 64 days.

This PR adds a migration to fix the Coretime state, which currently
includes end timeslices which are incorrect.

Full notes and plan here: https://hackmd.io/kurv6rTXTF6yvaUJ9uSNoQ for
work to continue while I'm OOO

try-runtime tests are included in the PR and the HackMD linked above
includes steps to manually test the upgrade with chopsticks.

---------

Co-authored-by: Tsvetomir Dimitrov <tsvetomir@parity.io>
Co-authored-by: eskimor <eskimor@no-such-url.com>
Co-authored-by: eskimor <eskimor@users.noreply.github.com>
Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: fellowship-merge-bot[bot] <151052383+fellowship-merge-bot[bot]@users.noreply.github.com>

.github/workflows/runtimes-matrix.json

@@ -65,6 +65,7 @@
     "name": "coretime-polkadot",
     "package": "coretime-polkadot-runtime",
     "path": "system-parachains/coretime/coretime-polkadot",
+    "uri": "wss://polkadot-coretime-rpc.polkadot.io:443",
     "is_relay": false
   },
   {

CHANGELOG.md

@@ -16,6 +16,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Fixed
 
 - Chain-spec generator: propagate the `on_chain_release_build` feature to the chain-spec generator. Without this the live/genesis chain-specs contain a wrongly-configured WASM blob ([polkadot-fellows/runtimes#450](https://github.com/polkadot-fellows/runtimes/pull/450)).
+- Adds a migration to the Polkadot Coretime chain to fix an issue from the initial Coretime migration. ([polkadot-fellows/runtimes#458](https://github.com/polkadot-fellows/runtimes/pull/458))
 
 ### Added
 
@@ -25,7 +26,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Fixed
 
-- Kusama: Revert accidental changes to inflation formula ([polkadot-fellows/runtimes#445](tps://github.com/polkadot-fellows/runtimes/pull/445)).
+- Kusama: Revert accidental changes to inflation formula ([polkadot-fellows/runtimes#445](https://github.com/polkadot-fellows/runtimes/pull/445)).
 
 ## [1.3.1] 23.08.2024
 

system-parachains/coretime/coretime-polkadot/Cargo.toml

@@ -42,6 +42,7 @@ pallet-transaction-payment = { workspace = true }
 pallet-transaction-payment-rpc-runtime-api = { workspace = true }
 pallet-utility = { workspace = true }
 sp-api = { workspace = true }
+sp-arithmetic = { workspace = true }
 sp-block-builder = { workspace = true }
 sp-consensus-aura = { workspace = true }
 sp-core = { workspace = true }
@@ -131,6 +132,7 @@ std = [
 	"serde",
 	"serde_json/std",
 	"sp-api/std",
+	"sp-arithmetic/std",
 	"sp-block-builder/std",
 	"sp-consensus-aura/std",
 	"sp-core/std",

system-parachains/coretime/coretime-polkadot/src/lib.rs

@@ -23,6 +23,7 @@
 include!(concat!(env!("OUT_DIR"), "/wasm_binary.rs"));
 
 mod coretime;
+mod migrations;
 // Genesis preset configurations.
 pub mod genesis_config_presets;
 #[cfg(test)]
@@ -117,6 +118,7 @@ pub type UncheckedExtrinsic =
 pub type Migrations = (
 	// permanent
 	pallet_xcm::migration::MigrateToLatestXcmVersion<Runtime>,
+	migrations::FixMigration,
 );
 
 /// Executive: handles dispatch to the various modules.
@@ -140,7 +142,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("coretime-polkadot"),
 	impl_name: create_runtime_str!("coretime-polkadot"),
 	authoring_version: 1,
-	spec_version: 1_003_000,
+	spec_version: 1_003_003,
 	impl_version: 0,
 	apis: RUNTIME_API_VERSIONS,
 	transaction_version: 0,