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1. data Primary

   persistable-record	Database.Record.KeyConstraint

   Constraint type. Primary key.

2. type PrimaryColumnConstraint = ColumnConstraint Primary

   persistable-record	Database.Record.KeyConstraint

   Specialized primary constraint.

3. type PrimaryConstraint = KeyConstraint Primary

   persistable-record	Database.Record.KeyConstraint

   Specialized primary constraint.

4. module Database.Record.Persistable

   This module defines proposition interfaces for database value type and record type width.

5. type PersistableRecordWidth a = ProductConst Sum Int a

   persistable-record	Database.Record.Persistable

   Proposition to specify width of Haskell type a. The width is length of database value list which is converted from Haskell type a.

6. data PersistableSqlType q

   persistable-record	Database.Record.Persistable

   Proposition to specify type q is database value type, contains null value

7. class Eq q => PersistableType q

   persistable-record	Database.Record.Persistable

   Interface of derivation rule for PersistableSqlType.

8. class PersistableWidth a

   persistable-record	Database.Record.Persistable

   PersistableWidth a is implicit rule to derive PersistableRecordWidth a width proposition for type a. Generic programming (https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/glasgow_exts.html#generic-programming) with default signature is available for PersistableWidth class, so you can make instance like below:

   {-# LANGUAGE DeriveGeneric #-}
   import GHC.Generics (Generic)
   --
   data Foo = Foo { ... } deriving Generic
   instance PersistableWidth Foo
   

9. data ProductConst a b

   persistable-record	Database.Record.Persistable

   Restricted in product isomorphism record type b

10. module Database.Persist.Postgresql

    A postgresql backend for persistent.

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