## 2.5

* changes for read/write typeclass split

## 2.2.2

* Postgresql primary key is Int4, not Int8 [#519](https://github.com/yesodweb/persistent/issues/519)

## 2.2.1.2

* Allow postgresql-simple 0.5

## 2.2.1.1

Query pg_catalog instead of information_schema for metadata.
This helps with permission issues as reported in issue #501

## 2.2.1

* Fix treatment of `NULL`s inside arrays.  For example, now you
  can use `array_agg` on a nullable column.

* New derived instances for `PostgresConf`: `Read`, `Data` and `Typeable`.

* New `mockMigration` function.  Works like `printMigration` but
  doesn't need a database connection.

* Fix typo on error message of the `FromJSON` instance of `PostgresConf`.

## 2.2

* Optimize the `insertMany` function to insert all rows and retrieve their keys in one SQL query. [#407](https://github.com/yesodweb/persistent/pull/407)

## 2.1.6

* Postgresql exceptions [#353](https://github.com/yesodweb/persistent/issues/353)

## 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`.