diff --git a/boards/models/thread.py b/boards/models/thread.py
--- a/boards/models/thread.py
+++ b/boards/models/thread.py
@@ -1,7 +1,7 @@
 import logging
 from adjacent import Client
 
-from django.db.models import Count, Sum
+from django.db.models import Count, Sum, QuerySet
 from django.utils import timezone
 from django.db import models
 
@@ -72,7 +72,7 @@ class Thread(models.Model):
     bumpable = models.BooleanField(default=True)
     max_posts = models.IntegerField(default=get_thread_max_posts)
 
-    def get_tags(self) -> list:
+    def get_tags(self) -> QuerySet:
         """
         Gets a sorted tag list.
         """
@@ -118,7 +118,7 @@ class Thread(models.Model):
 
         return self.bumpable and not self.archived
 
-    def get_last_replies(self) -> list:
+    def get_last_replies(self) -> QuerySet:
         """
         Gets several last replies, not including opening post
         """
@@ -145,7 +145,7 @@ class Thread(models.Model):
                                  reply_count - 1)
         return reply_count - last_replies_count - 1
 
-    def get_replies(self, view_fields_only=False) -> list:
+    def get_replies(self, view_fields_only=False) -> QuerySet:
         """
         Gets sorted thread posts
         """
@@ -156,10 +156,10 @@ class Thread(models.Model):
             query = query.defer('poster_ip')
         return query.all()
 
-    def get_top_level_replies(self):
+    def get_top_level_replies(self) -> QuerySet:
         return self.get_replies().exclude(refposts__threads__in=[self])
 
-    def get_replies_with_images(self, view_fields_only=False) -> list:
+    def get_replies_with_images(self, view_fields_only=False) -> QuerySet:
         """
         Gets replies that have at least one image attached
         """
@@ -167,14 +167,6 @@ class Thread(models.Model):
         return self.get_replies(view_fields_only).annotate(images_count=Count(
             'images')).filter(images_count__gt=0)
 
-    # TODO Do we still need this?
-    def add_tag(self, tag: Tag):
-        """
-        Connects thread to a tag and tag to a thread
-        """
-
-        self.tags.add(tag)
-
     def get_opening_post(self, only_id=False) -> Post:
         """
         Gets the first post of the thread