* Unique constraints are correctly generated. [#922](https://github.com/yesodweb/persistent/pull/922) @kderme
## 2.10.2
* Add a new `RawSqlite` type and `withRawSqliteConnInfo` function that allow access to the underlying Sqlite `Connection` type. [#772](https://github.com/yesodweb/persistent/pull/772)
* Expose the internals of `Connection` in an Internal module, allowing the user to call SQLite functions via the C FFI. [#772](https://github.com/yesodweb/persistent/pull/772)
* Add a flag for SQLITE_STAT4 and enable it by default, allowing for better query optimisation when using ANALYZE. This breaks the query planner stability guarantee, but the required flag for that isn't enabled or exposed by persistent. Only affects the vendored SQLite library, has no effect when using system SQLite.
* Add support for migrating entities with composite primary keys. Fixes [#669](https://github.com/yesodweb/persistent/issues/669)
* Fix a bug when using the `Filter` datatype directly. See [#915](https://github.com/yesodweb/persistent/pull/915) for more details.
* Add flag to enable full-text search extensions (enabled by default)
* Add flag to enable URI filename support (enabled by default)
* Add flag to enable using usleep (enabled by default)
- Enabling usleep allows sqlite to use a finer granularity when sleeping (reduces time between locks)
* Add flag to enable json1 extension (enabled by default)
* Update the vendored SQLite C library from 3.19.3 to 3.22.0. See [the SQLite changelog](https://sqlite.org/changes.html) for details.
* Updated `SqlBackend` definition to set `connPutManySql`. [#770](https://github.com/yesodweb/persistent/pull/770)
* Switch from `MonadBaseControl` to `MonadUnliftIO`
* Adds a new function `stepConn`, which uses an additional parameter to give more detailed error messages [#750](https://github.com/yesodweb/persistent/pull/750)
* Restores the previous function signature of `step`, which was accidentally changed in 2.6.3.2
* This release accidentally broke API, and is deprecated on Hackage.
* Provide more detailed error messages when using the `step` function [#730](https://github.com/yesodweb/persistent/pull/730)
* Fix migration to avoid creating foreign-key constraints in temporary tables [#736](https://github.com/yesodweb/persistent/pull/736)
* Add 'use-pkgconfig' flag to use pkg-config to find system SQLite library.
* Update the vendored SQLite C library from 3.12.1 to 3.19.3. See [the SQLite changelog](https://sqlite.org/changes.html) for details.
