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diff --git a/app/lib/django_comments/models.py b/app/lib/django_comments/models.py
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+++ b/app/lib/django_comments/models.py
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+from six import python_2_unicode_compatible
+from django.conf import settings
+from django.db import models
+from django.utils import timezone
+from django.utils.translation import ugettext_lazy as _
+
+from .abstracts import (
+    COMMENT_MAX_LENGTH, BaseCommentAbstractModel, CommentAbstractModel,
+)
+
+
+class Comment(CommentAbstractModel):
+    class Meta(CommentAbstractModel.Meta):
+        db_table = "django_comments"
+
+
+@python_2_unicode_compatible
+class CommentFlag(models.Model):
+    """
+    Records a flag on a comment. This is intentionally flexible; right now, a
+    flag could be:
+
+        * A "removal suggestion" -- where a user suggests a comment for (potential) removal.
+
+        * A "moderator deletion" -- used when a moderator deletes a comment.
+
+    You can (ab)use this model to add other flags, if needed. However, by
+    design users are only allowed to flag a comment with a given flag once;
+    if you want rating look elsewhere.
+    """
+    user = models.ForeignKey(
+        settings.AUTH_USER_MODEL, verbose_name=_('user'), related_name="comment_flags",
+        on_delete=models.CASCADE,
+    )
+    comment = models.ForeignKey(
+        # Translators: 'comment' is a noun here.
+        Comment, verbose_name=_('comment'), related_name="flags", on_delete=models.CASCADE,
+    )
+    # Translators: 'flag' is a noun here.
+    flag = models.CharField(_('flag'), max_length=30, db_index=True)
+    flag_date = models.DateTimeField(_('date'), default=None)
+
+    # Constants for flag types
+    SUGGEST_REMOVAL = "removal suggestion"
+    MODERATOR_DELETION = "moderator deletion"
+    MODERATOR_APPROVAL = "moderator approval"
+
+    class Meta:
+        db_table = 'django_comment_flags'
+        unique_together = [('user', 'comment', 'flag')]
+        verbose_name = _('comment flag')
+        verbose_name_plural = _('comment flags')
+
+    def __str__(self):
+        return "%s flag of comment ID %s by %s" % (
+            self.flag, self.comment_id, self.user.get_username()
+        )
+
+    def save(self, *args, **kwargs):
+        if self.flag_date is None:
+            self.flag_date = timezone.now()
+        super(CommentFlag, self).save(*args, **kwargs)