## 2.1.5.3
Migrations for custom primary keys
## 2.1.5.2
Support foreign key references to composite primary keys #389
## 2.1.5
* Allow timestamp value in database to be serialized (presumes UTC timezone) [Yesod #391](https://github.com/yesodweb/persistent/issues/391)
## 2.1.4
* Treat unknown extension types as PersistDbSpecific values [#385](https://github.com/yesodweb/persistent/pull/385)
## 2.1.3
* Added a `Show` instance for `PostgresConf`.
* `createPostgresqlPoolModified` added, see [relevant mailing list discussion](https://groups.google.com/d/msg/yesodweb/qUXrEN_swEo/O0pFwqwQIdcJ)
## 2.1.2.1
Documentation typo fix
## 2.1.1
Added `FromJSON` instance for `PostgresConf`.