Sql 如何创建一个已经安装了 hstore 扩展的新数据库

最近有I went into trouble人试图将hstore与Django一起使用.我是这样安装hstore的:

$ sudo -u postgres psql
postgres=# CREATE EXTENSION hstore;
WARNING:  => is deprecated as an operator name
DETAIL:  This name may be disallowed altogether in future versions of PostgreSQL.
CREATE EXTENSION
postgres=# \dx
                           List of installed extensions
  Name   | Version |   Schema   |                   Description                    
---------+---------+------------+--------------------------------------------------
 hstore  | 1.0     | public     | data type for storing sets of (key, value) pairs
 plpgsql | 1.0     | pg_catalog | PL/pgSQL procedural language
(2 rows)

天真地认为我的新数据库将包括hstore.事实并非如此:

$ createdb dbtest
$ psql -d dbtest -c '\dx'
                 List of installed extensions
  Name   | Version |   Schema   |         Description          
---------+---------+------------+------------------------------
 plpgsql | 1.0     | pg_catalog | PL/pgSQL procedural language
(1 row)

有没有办法在新创建的数据库中自动存储hstore？