Add api_token model and dao

tests/app/dao/test_tokens_dao.py

@@ -0,0 +1,16 @@
+import uuid
+
+from app.dao import api_tokens_dao
+from app.models import ApiToken
+
+
+def test_should_create_token(notify_api, notify_db, notify_db_session, sample_service):
+    token = uuid.uuid4()
+    api_token = ApiToken(**{'token': token, 'service_id': sample_service.id})
+
+    api_tokens_dao.save_token_model(api_token)
+
+    all_tokens = api_tokens_dao.get_model_api_tokens()
+
+    assert len(all_tokens) == 1
+    assert all_tokens[0].token == str(token)