database_connectedDatabase connection is opened. The database is not guaranteed to be initialized.
database_ready: Fired when database initialized and all fixtures have been loaded.
lino.utils.djangotest.TestCase.setUp(), i.e. at the beginning of each test case.
receiver: the standard Django receiver decorator
lino.ui.models also defines a handler which will fire
the database_connected signal
and call the
method on each of the following signals: