* Change copyright year to 2023 from 2022

* Fix incorrect update of copyright year

* Remove years from copy right header

* Fix remaining files

* Fix typo in a header and remove update-copyright.sh

* [Fix] Try-state feature-gated for BagsList

* fix comment

* fix try_state remote-tests

* feature-gate try-state remote test for bags-list

* remove try-state from a migration

* more SortedListProvider fixes

* more fixes

* more fixes to allow do_try_state usage in other crates

* do-try-state for fuzz

* more fixes

* more fixes

* remove feature-flag

* do-try-state

* fix review comments

* Update frame/bags-list/src/mock.rs

Co-authored-by: Anton <[email protected]>

---------

Co-authored-by: parity-processbot <>
Co-authored-by: Anton <[email protected]>

* delete releases

* use standard pallet storage version

* migrate to standard storage version for staking

* not compiling

* keep old releases enum around for decoding

* fix releases

* rename old releases

* retriggering ci

* fix migration comments

* doc update

Co-authored-by: parity-processbot <>

Causing issues on Kusama...

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

Co-authored-by: parity-processbot <>

* replace pallet level unboundedness to individual storage items

* bound structs

* bounding history depth

* defensive error

* use the era history depth from config

* clean up history depth from storage in v11

* keep the name HistoryDepth for the new configuration value

* use u32 for history depth in node runtime

* improve doc comments

* add HistoryDepth to mock runtimes with pallet-staking

* rustfmt

* refactor and doc improve

* apply re-benchmarked weight for staking

* pr feedback improvements

* test for claimed rewards following the expected bounds

* refactor test to calculate first and last reward era programmatically

* verify previous eras cannot be claimed

* add migration v12

* ".git/.scripts/bench-bot.sh" pallet dev pallet_staking

* fix compiler error

* corrupting history depth does not lead to catastrophic issue

* fix new line

* remove unused import

* fmt

* add test to document scenario where history depth is reduced without migration

* fmt

* Update frame/staking/src/lib.rs

Co-authored-by: Kian Paimani <[email protected]>

* Update frame/staking/src/migrations.rs

Co-authored-by: Kian Paimani <[email protected]>

* doc for all storage items bounded by HistoryDepth

* Update frame/staking/src/pallet/mod.rs

Co-authored-by: Kian Paimani <[email protected]>

* Update frame/staking/src/tests.rs

Co-authored-by: Kian Paimani <[email protected]>

* pr feedback fixes

* Update frame/staking/src/tests.rs

Co-authored-by: Kian Paimani <[email protected]>

* remove extra checks

* fix merge

* fmt

Co-authored-by: command-bot <>
Co-authored-by: Kian Paimani <[email protected]>
Co-authored-by: kianenigma <[email protected]>

* Put type constraint at the end

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

* Fix rust features

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

* Use new OnRuntimeUpgrade hooks

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

* Use new OnRuntimeUpgrade hooks

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

* update interfaces of OnRuntimeUpgrade & Hooks

Signed-off-by: linning <[email protected]>

* remove try-runtime for PreStateDigest

Signed-off-by: linning <[email protected]>

* remove the Default bound of PreStateDigest

Signed-off-by: linning <[email protected]>

* remove try-runtime for PreStateDigest & pre_upgrade

Signed-off-by: linning <[email protected]>

* remove tmp storage between upgrade hooks

Signed-off-by: linning <[email protected]>

* ensure hooks are storage noop

Signed-off-by: linning <[email protected]>

* remove OnRuntimeUpgradeHelpersExt

Signed-off-by: linning <[email protected]>

* cargo check & fmt

Signed-off-by: linning <[email protected]>

* rename PreStateDigest to PreUpgradeState

Signed-off-by: linning <[email protected]>

* replace associate type with codec & vec

Signed-off-by: linning <[email protected]>

* add helper strcut to help encode/decode tuple

Signed-off-by: linning <[email protected]>

* update comment

Signed-off-by: linning <[email protected]>

* fix

Signed-off-by: linning <[email protected]>

* add test

Signed-off-by: linning <[email protected]>

* address comment

Signed-off-by: linning <[email protected]>

* fix doc

Signed-off-by: linning <[email protected]>

* fix ci

Signed-off-by: linning <[email protected]>

* address comment

Signed-off-by: linning <[email protected]>

* add more test cases

Signed-off-by: linning <[email protected]>

* make clippy happy

Signed-off-by: linning <[email protected]>

* fmt

Signed-off-by: linning <[email protected]>

* update comment

Signed-off-by: linning <[email protected]>

* fmt

Signed-off-by: linning <[email protected]>

Signed-off-by: linning <[email protected]>

* [Feature] Part 1: add TargetList for validator ranking

* remove redundant todo

* remove typo

* cleanup

* implement score

* more fixes

* fix thresholds

* fmt

* Remove the stuff that has to come in the next PR, some fixes

* extended balance import

* Change all the references from VoteWeight to Self::Score

* Add a migration for VoterBagsList

* fix score

* add targetList to nomination-pools tests

* fix bench

* address review comments

* change get_npos_targets

* address more comments

* remove thresholds for the time being

* fix instance reference

* VoterBagsListInstance

* reus

* remove params that are not used yet

* Introduced pre/post upgrade try-runtime checks

* fix

* fixes

* fix migration

* fix migration

* fix post_upgrade

* change

* Fix

* eloquent PhantomData

* fix PD

* more fixes

* Update frame/staking/src/pallet/impls.rs

Co-authored-by: Squirrel <[email protected]>

* is_nominator now works

* fix test-staking

* build fixes

* fix remote-tests

* Apply suggestions from code review

Co-authored-by: parity-processbot <>
Co-authored-by: kianenigma <[email protected]>
Co-authored-by: Squirrel <[email protected]>
Co-authored-by: Kian Paimani <[email protected]>

* add missing version to dependencies

* Huh

* add features more

* more fixing

* last touches

* it all finally works

* remove some feature gates

* remove unused

* fix old macro

* make it work again

* fmt

* remove unused import

* ".git/.scripts/fmt.sh" 1

* Cleanup more

* fix and rename everything

* a few clippy fixes

* Add try-runtime feature

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

* small fixes

* fmt

* Update bin/node-template/runtime/src/lib.rs

* fix build

* Update utils/frame/try-runtime/cli/src/lib.rs

Co-authored-by: David <[email protected]>

* Update utils/frame/try-runtime/cli/src/commands/execute_block.rs

Co-authored-by: David <[email protected]>

* address all review comments

* fix typos

* revert spec change

* last touches

* update docs

* fmt

* remove some debug_assertions

* fmt

Signed-off-by: Oliver Tale-Yazdi <[email protected]>
Co-authored-by: command-bot <>
Co-authored-by: Oliver Tale-Yazdi <[email protected]>
Co-authored-by: David <[email protected]>

* Fix slashing migration to v10

* add some logs

* Fix default version

* fmt

* Move doc to struct

Co-authored-by: Wilfried Kopp <[email protected]>

* initial draft of fixing slashing

* fix test

* Update frame/staking/src/tests.rs

Co-authored-by: Piotr Mikołajczyk <[email protected]>

* last touches

* add more detail about unbonding

* add migration

* fmt

Co-authored-by: Piotr Mikołajczyk <[email protected]>
Co-authored-by: parity-processbot <>

* generate_storage_alias: Rewrite as proc macro attribute

This rewrites the `generate_storage_alias!` declarative macro as proc-macro attribute. While doing
this the name is changed to `storage_alias`. The prefix can now also be the name of a pallet. This
makes storage aliases work in migrations for all kind of chains and not just for the ones that use
predefined prefixes.

* Fix compilation and FMT

* Moare fixes

* 🤦

* ......

* Rework the syntax and support instancing

* FMT

* Prefix variants with `Storage`

* Make it compile

* Fix where clause on rust stable

* Implement the new validator-in-bags-list scenario + migration

* Apply suggestions from code review

Co-authored-by: Zeke Mostov <[email protected]>

* some review comments

* guard the migration

* some review comments

* Fix tests 🤦

‍♂️

* Fix build

* fix weight_of_fn

* reformat line width

* make const

* use weight of fn cached

* SortedListProvider -> VoterList

* Fix all build and docs

* check post migration

Co-authored-by: Zeke Mostov <[email protected]>

* Removed counters and used CountedStorageMap instead.

* Little refactoring

* Update frame/staking/src/migrations.rs

Co-authored-by: Shawn Tabrizi <[email protected]>

* Removed redundant code to update counter for validator & nominator.

* Removed redundant code to update counter for validator & nominator.

* Removed unreachable code to inject the hashed prefix for nominator & validator.

* Removed redundant check for nominator & validator count.

* Generated `fn prefix_hash` for `CountedStorageMap`.

* Applied changes from `cargo fmt`

* Possible correct implementation of migration code

* Implemented fn module_prefix, storage_prefix and prefix_hash.

* Removed counted_map.rs

* Renamed `fn storage_prefix` to `storage_counter_prefix`.

* Update frame/support/src/storage/types/counted_map.rs

* Update frame/bags-list/remote-tests/src/snapshot.rs

* Update frame/support/src/storage/types/counted_map.rs

* Fixed errors.

Co-authored-by: Shawn Tabrizi <[email protected]>
Co-authored-by: Guillaume Thiolliere <[email protected]>

* fix bags list

* improve doc

* doc

* inner doc

* fix test

* Update docs in frame/election-provider-support/src/lib.rs

* fix staking impl

* prepend unsafe to clear and regenerate

* fix test

Co-authored-by: Keith Yeung <[email protected]>
Co-authored-by: Shawn Tabrizi <[email protected]>

* remove extra whitespace

Co-authored-by: Kian Paimani <[email protected]>

* only emit rebag event on success

* add doc explaining the term voter

* revamp/simplify rebag test

* ensure genesis accounts are placed into the correct nodes/bags

* bond_extra implicitly rebags

* types at top; doc public type

* start sketching out adjustable thresholds

* add integrity test for voter bag threshold requirements

* get rid of BagIdx

This reorganizes bag storage such that bags are always referred to
by their upper threshold. This in turn means that adding and removing
bags is cheaper; you only need to migrate certain voters, not all of them.

* implement migration logic for when the threshold list changes

* start sketching out threshold proc macros

* further refine macro signatures

* WIP: implement make_ratio macro

* start rethinking the process of producing threshold lists

The macro approach seems to be a non-starter; that only really works
if we're throwing around numeric literals everywhere, and that's just
not nice in this case.

Instead, let's write helper functions and make it really easy to
generate the tables in separate, permanent files, which humans
can then edit.

* write helper functions to emit voter bags module

* WIP: demo generating voter bags for a realistic runtime

This isn't yet done, becuase it seems to take a Very Long Time to run,
and it really shouldn't. Need to look into that.

Still, it's a lot closer than it was this morning.

* rm unnecessary arg_enum

* fix voter bags math

Turns out that when you're working in exponential space, you need
to divide, not subtract, in order to keep the math working properly.

Also neaten up the output a little bit to make it easier to read.

* add computed voter bags thresholds to node

* fixup some docs

* iter from large bags to small, fulfuilling the contract

* make tests compile

* add VoterBagThresholds to some configs

* ensure that iteration covers all voters even with implied final bag

* use sp_std::boxed::Box;

* fix unused import

* add some more voter bags tests

* file_header.txt

* integrity test to ensure min bag exceeds existential weight

* add more debug assertions about node list length

* rm unused imports

* Kian enters

* Update frame/election-provider-support/src/onchain.rs

Co-authored-by: Zeke Mostov <[email protected]>

* Suggestions for #9081 (Store voters in unsorted bags) (#9328)

* Add some debug asserts to node::get and remove_node

* Improve the debug asserts in remove_node

* improve debug asserts

* Space

* Remove bad assertions

* Tests: WIP take_works

* Take test

* Doc comment

* Apply suggestions from code review

Co-authored-by: Kian Paimani <[email protected]>

* Test storage is cleaned up;

* formatting

* Switch to simpler thresholds

* Update the storage cleanup test

* Remove hardcoded values from benchmark to make it more robust

* Fix tests to acces bags properly

* Sanity check WIP; tests failing

* Update sanity checks to be more correct

* Improve storage cleanup tests

* WIP remote_ext_tests

* Some notes on next steps

* Remove some stuff that was for remote-ext tests

* Some more cleanup to reduce diff

* More :clean:

* Mo cleanin

* small fix

* A lot of changes from kian

Co-authored-by: Kian Paimani <[email protected]>
Co-authored-by: kianenigma <[email protected]>

* merge fallout

* Run cargo +nightly fmt

* Fix a bunch of stuff, remove not needed runtime arg of make-bags

* add logs

* Glue the new staking bags to the election snapshot (#9415)

* Glue the new staking bags to the election snapshot

* add CheckedRem (#9412)

* add CheckedRem

* fix

* Run fmt

* Test comment

Co-authored-by: Xiliang Chen <[email protected]>
Co-authored-by: emostov <[email protected]>

* Update node runtime with VoterSnapshotPerBlock

* Unit test for pallet-staking unsorted bags feature (targets #9081) (#9422)

* impl notional_bag_for_works

* Add tests: insert_as_works & insert_works

* Impl test: remove_works

* Trivial cleaning

* Add test: update_position_for_works

* Write out edge case; probably can delete later

* Add test: bags::get_works

* Add test: remove_node_happy_path_works

* Add test: remove_node_bad_paths_documented

* WIP: voting_data_works

* done

* Improve test voting_data_works

* Add comment

* Fill out test basic_setup_works

* Update: iteration_is_semi_sorted

* Improve remove_works

* Update update_position_for_works; create set_ledger_and_free_balance

* Improve get_works

* Improve storage clean up checks in remove test

* Test: impl rebag_works + insert_and_remove_works

* forgot file -  Test: impl rebag_works + insert_and_remove_works

* Small tweak

* Update voter_bags test to reflect unused bags are removed

* Unbond & Rebond: do_rebag

* Prevent infinite loops with duplicate tail insert

* Check iter.count on voter list in pre-migrate

* undo strang fmt comment stuff

* Add in todo

Co-authored-by: kianenigma <[email protected]>

* Try prepare for master merge

* Reduce diff

* Add comment for test to add

* Add in code TODO for update_position efficiency updates

* Initial impl compiles

* impl StakingVoterListStub

* Sample impl<T: Config> VoterListProvider<T> for VoterList<T>

* impl VoterListProvider for voter-bags

* WIP integrate pallet-voter-bags to staking mock

* the trait `pallet_staking::pallet::pallet::Config` is not implemented for `mock::Test`

* random

* pushing my stuff

* Mock working

* WIP voter list tests

* Add bag insert, remove tests

* Add test for bag insert and remove

* Add remaining tests for VoterList

* Add tests for node

* Add rebag works

* Add rebag extrinsic tests

* Rename to bags-list and name the list .. list!

* Rename VoterBagThresholds => BagThresholds

* Add test count_works

* Test on_update_works

* test sanity check

* a round of test fixes

* push a lot of changes

* my last changes

* all bags-list test work; fmt

* Beautify some tests

* Doc comment for bags-list

* Add insert warnings

* Setup initial benchmark

* Wire up WeightInfo

* is_terminal wip; everything broken!

* Is terminal working

* add TODOs for remove_node

* clean up remoe_node

* Fix all staking tests

* retire VoterBagFor

* commit

* bring in stashed changes

* save

* bench pipeline works now, but I can't run stuff

* sabe

* benchmarks now run, but we have a failure

* WIP: Wire up make_bags

* bags-thresholds compiles

* Fix most build issues

* This will fix all the tests

* move bag thresholds to bags-list

* Move bag-thresholds bin to within pallet-bags

* Remove some unnescary TODOs

* Impl tets wrong_rebag_is_noop

* assert remove is a noop with bad data

* Assert integrity test panics

* Return an error when inserting duplicates

* Update to handle error in staking pallet when inserting to list

* Test contains and on_insert error

* Test re-nominate does not mess up list or count

* Everything builds and works, only the benchmark...

* fuck yeah benchmarks

* more cleanup, more hardening.

* use the bags list again

* fix benhc

* Some questions and changs for List::migration

* Fix migration removed_bags and new_bags usage

* Some trivial aesthetic changes

* Some more trivial changes

* tiny changes/

* mega rename

* fix all tests and ci build

* nit

* Test and fix migration

* nit

* fmt

* cargo run --quiet --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_staking --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/staking/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* fmt

* remove unused

* make a few things pub

* make node also pub.. for remote-ext test

* Fix all tests again

* Force bag changes in relevant benchmarks (targets #9507) (#9529)

* force rebag for unbond, rebond, and bond_extra

* nit

* Improve utils

* fmt

* nits

* Move generate_bags to its own pallet

* Get runtime-benchmarks feature setup with prepare_on_update_benchmark

* Withdraw unbonded kill working

* Nominate bench working

* some cleanup

* WIP

* update to check head pre & post conditions

* Add some post condition verification stuff for on_remove

* Update nominate

* fmt

* Improvements

* Fix build

* fix build with polkadot companion

* Update frame/bags-list/src/list/tests.rs

Co-authored-by: Kian Paimani <[email protected]>

* move generate-bag from frame to utils

* wip

* refactor WIP

* WIP save

* Refactor working

* some variable renaming

* WIP: prepare to remove head checks

* Finish MvP refactor

* Some cleanup

* Soem more cleanup

* save

* fix a lot of stuff

* Update client/db/src/bench.rs

Co-authored-by: Shawn Tabrizi <[email protected]>

* Apply suggestions from code review

* Apply suggestions from code review

* Fix some issues that came from trying to merge comments on github

* some small changes

* simplify it

Co-authored-by: Kian Paimani <[email protected]>
Co-authored-by: kianenigma <[email protected]>
Co-authored-by: Shawn Tabrizi <[email protected]>

* Build works

* Apply suggestions from code review

Co-authored-by: Guillaume Thiolliere <[email protected]>

* Apply suggestions from code review

Co-authored-by: Guillaume Thiolliere <[email protected]>

* Remove commented out debug assert

* Remove some unused deps and some unused benchmarking stuff

* Fix stakings ElectionDataProvider clear

* cargo run --quiet --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_bags_list --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/bags-list/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* cargo run --quiet --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_bags_list --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/bags-list/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* cargo run --quiet --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_bags_list --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/bags-list/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* cargo run --quiet --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_bags_list --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/bags-list/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* Improving staking pallet-bags-list migration

* fix build and some comments;

* comment

* Reduce visibility in bags list components

* make node.bag_upper only accesible to benchmarks

* Address some feedback; comments updates

* use nominator map comment

* fix vec capacity debug assert

* Apply suggestions from code review

Co-authored-by: Guillaume Thiolliere <[email protected]>

* clarify VoterSnapshotPerBlock

* Reduce diff on create_validators by wrapping with_seed

* Some small improvements to staking benches

* Soem comment updates

* fix vec capacity debug assert ... for real this time

* Reduce ListBags viz

* cargo run --quiet --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_staking --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/staking/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* cargo run --quiet --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_staking --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/staking/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* Remove supports_eq_unordered & Support eq_unordered

* Update utils/frame/generate-bags/src/lib.rs

Co-authored-by: Guillaume Thiolliere <[email protected]>

* Make total-issuance & minimium-balance CLI args; Dont use emptry ext

* Improve docs for generate bags CLI args

* Apply suggestions from code review

Co-authored-by: Kian Paimani <[email protected]>

* Apply suggestions from code review

Co-authored-by: Kian Paimani <[email protected]>

* Don't use default bags weight in node runtime

* Feature gating sanity_check not working

* Feature gate sanity check by creating duplicate fns

* Fix line wrapping

* Document VoteWeightProvider

* Make bags ext-builder not a module

* Apply suggestions from code review

Co-authored-by: Kian Paimani <[email protected]>

* use pallet_bags_list instead of crate in mock

* Make get_bags test helper fn live in List

* use remove_from_storage_unchecked for node removal

* Remove count of ids removed in remove_many

* Add node sanity check, improve list sanity check

* Do a list sanity check after on_update

* List::migrate: clean up debug assert, exit early when no change in thresholds

* Improve public doc comments for pallet_bags_list::list::List

* Improve public doc comments for pallet_bags_list::list::List

* Update generate bags docs

* Fix grammar in bags-list benchmark

* Add benchmark case for `rebag` extrinsic

* Add count parameter to List::clear; WIP adding MaxEncodedLen to list'

* MaxEncodeLen + generate_storage_info not working for Bag or Node

* Get MaxEncodeLen derive to work

* Try to correctly feature gate SortedListProvider::clear

* Use u32::MAX, not u32::max_value

* Get up to nominators_quota noms

* SortedListProvider::clear takes an Option

* Eplicitly ignore SortedListProvider return value

* Fix doc comment

* Update node-runtime voter snapshot per block

* Add test get_max_len_voters_even_if_some_nominators_are_slashed

* Add test only_iterates_max_2_times_nominators_quota

* Fix generate bags cargo.toml

* use sp_std vec

* Remove v8 migration hooks from pallet-staking

* Update npos trait

* Try respect line width

* cargo run --quiet --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_bags_list --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/bags-list/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* Update frame/bags-list/src/benchmarks.rs

* Unwrap try-runtime error; remove sortedlistprovider pre upgrade len  check

* trigger ci

* restore

* trigger ci

* restore

* trigger ci

* revert

* trigger ci

* revert

Co-authored-by: Peter Goodspeed-Niklaus <[email protected]>
Co-authored-by: Kian Paimani <[email protected]>
Co-authored-by: Peter Goodspeed-Niklaus <[email protected]>
Co-authored-by: kianenigma <[email protected]>
Co-authored-by: Xiliang Chen <[email protected]>
Co-authored-by: Parity Benchmarking Bot <[email protected]>
Co-authored-by: Shawn Tabrizi <[email protected]>
Co-authored-by: Guillaume Thiolliere <[email protected]>

* Reorg migration and pallet and pallet impls

* Fix imports in untouched modules

* Add file headers

* Add header for migrations

* Improve comment

* Move OnOffenceHandler impl for Pallet to impl.rs

* fmt