working but not passing test_analysis

rowers/models.py

@@ -3730,3 +3730,16 @@ class VideoAnalysis(models.Model):
 
     def __str__(self):
         return self.name
+
+
+
+class ShareKey(models.Model):
+    location = models.TextField() # absolute path
+    token = models.CharField(max_length=40, primary_key=True)
+    creation_date = models.DateTimeField(auto_now_add=True)
+    expiration_seconds = models.BigIntegerField()
+
+
+    @property
+    def expired(self):
+        return self.creation_date + datetime.timedelta(self.expiration_seconds) < timezone.now()