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chore: 0.45.1 Release Notes (#11109) 

* 0.45.1 Release Notes

* Update RELEASE_NOTES.md

Co-authored-by: Amaury <1293565+amaurym@users.noreply.github.com>

Co-authored-by: Amaury <1293565+amaurym@users.noreply.github.com>
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## [Unreleased]
## [v0.45.1](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.45.1) - 2022-02-03
### Bug Fixes
* (grpc) [\#10985](https://github.com/cosmos/cosmos-sdk/pull/10992) The `/cosmos/tx/v1beta1/txs/{hash}` endpoint returns a 404 when a tx does not exist.
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### Improvements
* [\#10407](https://github.com/cosmos/cosmos-sdk/pull/10407) Add validation to `x/upgrade` module's `BeginBlock` to check accidental binary downgrades
* [\#10407](https://github.com/cosmos/cosmos-sdk/pull/10407) Added validation to `x/upgrade` module's `BeginBlock` to check accidental binary downgrades
* [\#10768](https://github.com/cosmos/cosmos-sdk/pull/10768) Extra logging in in-place store migrations.
## [v0.45.0](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.45.0) - 2022-01-18

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# Cosmos SDK v0.45.0 Release Notes
Cosmos SDK v0.45.0 is a logical continuation of the v0.44.\* series, but brings a couple of state- and API-breaking changes requested by the community.
This release introduces bug fixes and improvements on the Cosmos SDK v0.45 series:
### State-Breaking Changes
Highlights
+ Added the missing `iavl-cache-size` config parameter parsing to set a desired IAVL cache size. The default value is way to small for big chains, and causes OOM failures.
+ Added a check in `x/upgrade` module's `BeginBlock` preventing accidental binary downgrades
+ Fix: the `/cosmos/tx/v1beta1/txs/{hash}` endpoint returns correct return code (404) for a non existing tx.
There are few important changes in **gas consumption**, which improve the gas economics:
See the [Cosmos SDK v0.45.1 Changelog](https://github.com/cosmos/cosmos-sdk/blob/v0.45.1/CHANGELOG.md) for the exhaustive list of all changes and check other fixes in 0.45.x release series.
- We now charge gas in two new places: on `.Seek()` even if there are no entries, and for the key length (on top of the value length).
- When block gas limit is exceeded, we consume the maximum gas possible (to charge for the performed computation). We also fixed the bug when the last transaction in a block exceeds the block gas limit, it returns an error result, but the tx is actually committed successfully.
Finally, a small improvement in gov, we increased the maximum proposal description size from 5k characters to 10k characters.
### API-Breaking Changes
- The `BankKeeper` interface has a new `HasSupply` method to ensure that input denom actually exists on chain.
- The `CommitMultiStore` interface contains a new `SetIAVLCacheSize` method for a configurable IAVL cache size.
- `AuthKeeper` interface in `x/auth` now includes a function `HasAccount`.
- Moved `TestMnemonic` from `testutil` package to `testdata`.
**Full Diff**: https://github.com/cosmos/cosmos-sdk/compare/v0.45.0...v0.45.1
Finally, when using the `SetOrder*` functions in simapp, e.g. `SetOrderBeginBlocker`, we now require that all modules be present in the function arguments, or else the node panics at startup. We also added a new `SetOrderMigration` function to set the order of running module migrations.
### Improvements
- Speedup improvements (e.g. speedup iterator creation after delete heavy workloads, lower allocations for `Coins.String()`, reduce RAM/CPU usage inside store/cachekv's `Store.Write`) are included in this release.
- Upgrade Rosetta to v0.7.0 .
- Support in-place migration ordering.
- Copied and updated `server.GenerateCoinKey` and `server.GenerateServerCoinKey` functions to the `testutil` package. These functions in `server` package are marked deprecated and will be removed in the next release. In the `testutil.GenerateServerCoinKey` version we added support for custom mnemonics in in-process testing network.
See our [CHANGELOG](./CHANGELOG.md) for the exhaustive list of all changes, or a full [commit diff](https://github.com/cosmos/cosmos-sdk/compare/v0.44.5...v0.45.0).