Foreign keys not generated properly on SQLite

[Florian Apolloner]

Depending on the order of apps in INSTALLED_APPS and what is already in the db ForeignKeys are not generated as foreign keys but only as the datatype which the foreign key should refer to:

$ rm bla.sqlite3 # Get rid of the database
$ ./manage.py syncdb
Creating tables ...
Creating table auth_permission ### auth is first in INSTALLED_APPS
Creating table auth_group_permissions
Creating table auth_group
Creating table auth_user_groups
Creating table auth_user_user_permissions
Creating table auth_user
Creating table django_content_type
Creating table django_session
Creating table django_site
Creating table testapp_test1 ### testapp is last in INSTALLED_APPS
Creating table testapp_test2

$ sqlite3 bla.sqlite3 
SQLite version 3.7.15.2 2013-01-09 11:53:05
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> .schema testapp_test1
CREATE TABLE "testapp_test1" (
    "id" integer NOT NULL PRIMARY KEY,
    "fk_id" integer NOT NULL REFERENCES "auth_user" ("id") ### foreign key is created properly
);
CREATE INDEX "testapp_test1_256ac373" ON "testapp_test1" ("fk_id");
sqlite> 
$ vim djtest/settings.py 
$ ### ^ moved testapp to top in INSTALLED_APPS
$ rm  bla.sqlite3 # Clean database again.
$ ./manage.py syncdb
Creating tables ...
Creating table testapp_test1 ### Now testapp is create before auth
Creating table testapp_test2
Creating table auth_permission ### Auth creation starts here
Creating table auth_group_permissions
Creating table auth_group
Creating table auth_user_groups
Creating table auth_user_user_permissions
Creating table auth_user
Creating table django_content_type
Creating table django_session
Creating table django_site

$ sqlite3 bla.sqlite3 
SQLite version 3.7.15.2 2013-01-09 11:53:05
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> .schema testapp_test1
CREATE TABLE "testapp_test1" (
    "id" integer NOT NULL PRIMARY KEY,
    "fk_id" integer NOT NULL ### foreign key is not generated
);
CREATE INDEX "testapp_test1_256ac373" ON "testapp_test1" ("fk_id");
sqlite> 

Can we do something against this? Can this also happen with other databases and as such threaten referential integrity?

EDIT:// MySQL and postgres seem to do what they should, we could enable ​http://www.sqlite.org/foreignkeys.html for SQLite versions which does support that :)