create base useranswer class

generic/models.py

@@ -394,6 +394,34 @@ class ExamUserStatus(models.Model):
         return f"{self.datetime}: {user} - {self.status} ({self.extra})"
     
 
+class CidUserAnswerBase(models.Model):
+
+    cid = models.BigIntegerField(
+        blank=True,
+        null=True,
+        help_text="Candidate ID (limitied by BigIntegerField size)",
+    )
+
+    created = models.DateTimeField(auto_now_add=True)
+    updated = models.DateTimeField(auto_now=True)
+
+
+    class Meta:
+        abstract = True
+        ordering = ["cid"]
+
+    def get_candidate_name(self) -> str:
+        if self.cid is not None:
+            return str(self.cid)
+        else:
+            return self.user.username
+
+    def get_candidate_masked(self) -> str:
+        if self.cid is not None:
+            return str(self.cid)
+        else:
+            return str(self.user.id)
+
 class NoteType(models.Model):
     note_type = models.CharField(max_length=200)