diff --git a/src/blackboard/operations.py b/src/blackboard/operations.py
index c2503ba..18e8135 100644
--- a/src/blackboard/operations.py
+++ b/src/blackboard/operations.py
@@ -27,8 +27,7 @@ from .db import (
 )
 from .models import (
     Task, Comment, Output, Decision, Observation, Event,
-    Review, Experience, Card,
-    CARD_VALID_STATUSES, CARD_MANUAL_STATUSES, CARD_TYPE_SET,
+    Review, Experience,
 )
 
 logger = logging.getLogger("moziplus-v2.blackboard")