* Migration failure message with context
## 2.2
* Add a `RawSql` instance for `Key`. This allows selecting primary keys using functions like `rawSql`. [#407](https://github.com/yesodweb/persistent/pull/407)
* SqlBackend support for an optimized `insertMany`
## 2.1.6
Important! If persistent-template is not upgraded to 2.1.3.3
you might need to make sure `Int64` is in scope for your model declarations.
* add showMigration function
* explicitly use Int64 for foreign key references
## 2.1.5
Add `dbIdColumnsEsc` to Sql.Utils.
Used in persistent-postgresql 2.1.5.2
## 2.1.4
* Fix getBy with a primary key. #342
## 2.1.3
* Break self-referencing cycles in the entity declarations
## 2.1.2
* Error with `Double`s without a decimal part [#378](https://github.com/yesodweb/persistent/issues/378)
* `runSqlPool` does not perform timeout checks.
## 2.1.1.6
* One extra feature for #939: use `logDebugN` instead
## 2.1.1.5
* Better SQL logging [Yesod issue #939](https://github.com/yesodweb/yesod/issues/939)
## 2.1.1.3
Parse UTCTime in 8601 format [#339](https://github.com/yesodweb/persistent/issues/339)
## 2.1.1.1
Support for monad-control 1.0