Where does the travis stall comes from???

tests/base.py

@@ -9,9 +9,9 @@ from ogn_python import db   # noqa: E402
 class TestBaseDB(unittest.TestCase):
     @classmethod
     def setUpClass(cls):
-        db.drop_all()
         db.session.execute('CREATE EXTENSION IF NOT EXISTS postgis;')
         db.session.commit()
+        db.drop_all()
         db.create_all()
 
     def setUp(self):