diff --git a/lib/philomena/forums.ex b/lib/philomena/forums.ex
index b904395c..00132382 100644
--- a/lib/philomena/forums.ex
+++ b/lib/philomena/forums.ex
@@ -581,4 +581,100 @@ defmodule Philomena.Forums do
   def change_poll_vote(%PollVote{} = poll_vote) do
     PollVote.changeset(poll_vote, %{})
   end
+
+  alias Philomena.Forums.TopicSubscription
+
+  @doc """
+  Returns the list of topic_subscriptions.
+
+  ## Examples
+
+      iex> list_topic_subscriptions()
+      [%TopicSubscription{}, ...]
+
+  """
+  def list_topic_subscriptions do
+    Repo.all(TopicSubscription)
+  end
+
+  @doc """
+  Gets a single topic_subscription.
+
+  Raises `Ecto.NoResultsError` if the Topic subscription does not exist.
+
+  ## Examples
+
+      iex> get_topic_subscription!(123)
+      %TopicSubscription{}
+
+      iex> get_topic_subscription!(456)
+      ** (Ecto.NoResultsError)
+
+  """
+  def get_topic_subscription!(id), do: Repo.get!(TopicSubscription, id)
+
+  @doc """
+  Creates a topic_subscription.
+
+  ## Examples
+
+      iex> create_topic_subscription(%{field: value})
+      {:ok, %TopicSubscription{}}
+
+      iex> create_topic_subscription(%{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def create_topic_subscription(attrs \\ %{}) do
+    %TopicSubscription{}
+    |> TopicSubscription.changeset(attrs)
+    |> Repo.insert()
+  end
+
+  @doc """
+  Updates a topic_subscription.
+
+  ## Examples
+
+      iex> update_topic_subscription(topic_subscription, %{field: new_value})
+      {:ok, %TopicSubscription{}}
+
+      iex> update_topic_subscription(topic_subscription, %{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def update_topic_subscription(%TopicSubscription{} = topic_subscription, attrs) do
+    topic_subscription
+    |> TopicSubscription.changeset(attrs)
+    |> Repo.update()
+  end
+
+  @doc """
+  Deletes a TopicSubscription.
+
+  ## Examples
+
+      iex> delete_topic_subscription(topic_subscription)
+      {:ok, %TopicSubscription{}}
+
+      iex> delete_topic_subscription(topic_subscription)
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def delete_topic_subscription(%TopicSubscription{} = topic_subscription) do
+    Repo.delete(topic_subscription)
+  end
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for tracking topic_subscription changes.
+
+  ## Examples
+
+      iex> change_topic_subscription(topic_subscription)
+      %Ecto.Changeset{source: %TopicSubscription{}}
+
+  """
+  def change_topic_subscription(%TopicSubscription{} = topic_subscription) do
+    TopicSubscription.changeset(topic_subscription, %{})
+  end
 end
diff --git a/lib/philomena/forums/topic_subscription.ex b/lib/philomena/forums/topic_subscription.ex
new file mode 100644
index 00000000..6c559abc
--- /dev/null
+++ b/lib/philomena/forums/topic_subscription.ex
@@ -0,0 +1,18 @@
+defmodule Philomena.Forums.TopicSubscription do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  @primary_key false
+
+  schema "topic_subscriptions" do
+    belongs_to :topic, Philomena.Forums.Topic, primary_key: true
+    belongs_to :user, Philomena.Users.User, primary_key: true
+  end
+
+  @doc false
+  def changeset(topic_subscription, attrs) do
+    topic_subscription
+    |> cast(attrs, [])
+    |> validate_required([])
+  end
+end
diff --git a/test/philomena/forums_test.exs b/test/philomena/forums_test.exs
index abd04e3d..9c2efffa 100644
--- a/test/philomena/forums_test.exs
+++ b/test/philomena/forums_test.exs
@@ -344,4 +344,61 @@ defmodule Philomena.ForumsTest do
       assert %Ecto.Changeset{} = Forums.change_poll_vote(poll_vote)
     end
   end
+
+  describe "topic_subscriptions" do
+    alias Philomena.Forums.TopicSubscription
+
+    @valid_attrs %{}
+    @update_attrs %{}
+    @invalid_attrs %{}
+
+    def topic_subscription_fixture(attrs \\ %{}) do
+      {:ok, topic_subscription} =
+        attrs
+        |> Enum.into(@valid_attrs)
+        |> Forums.create_topic_subscription()
+
+      topic_subscription
+    end
+
+    test "list_topic_subscriptions/0 returns all topic_subscriptions" do
+      topic_subscription = topic_subscription_fixture()
+      assert Forums.list_topic_subscriptions() == [topic_subscription]
+    end
+
+    test "get_topic_subscription!/1 returns the topic_subscription with given id" do
+      topic_subscription = topic_subscription_fixture()
+      assert Forums.get_topic_subscription!(topic_subscription.id) == topic_subscription
+    end
+
+    test "create_topic_subscription/1 with valid data creates a topic_subscription" do
+      assert {:ok, %TopicSubscription{} = topic_subscription} = Forums.create_topic_subscription(@valid_attrs)
+    end
+
+    test "create_topic_subscription/1 with invalid data returns error changeset" do
+      assert {:error, %Ecto.Changeset{}} = Forums.create_topic_subscription(@invalid_attrs)
+    end
+
+    test "update_topic_subscription/2 with valid data updates the topic_subscription" do
+      topic_subscription = topic_subscription_fixture()
+      assert {:ok, %TopicSubscription{} = topic_subscription} = Forums.update_topic_subscription(topic_subscription, @update_attrs)
+    end
+
+    test "update_topic_subscription/2 with invalid data returns error changeset" do
+      topic_subscription = topic_subscription_fixture()
+      assert {:error, %Ecto.Changeset{}} = Forums.update_topic_subscription(topic_subscription, @invalid_attrs)
+      assert topic_subscription == Forums.get_topic_subscription!(topic_subscription.id)
+    end
+
+    test "delete_topic_subscription/1 deletes the topic_subscription" do
+      topic_subscription = topic_subscription_fixture()
+      assert {:ok, %TopicSubscription{}} = Forums.delete_topic_subscription(topic_subscription)
+      assert_raise Ecto.NoResultsError, fn -> Forums.get_topic_subscription!(topic_subscription.id) end
+    end
+
+    test "change_topic_subscription/1 returns a topic_subscription changeset" do
+      topic_subscription = topic_subscription_fixture()
+      assert %Ecto.Changeset{} = Forums.change_topic_subscription(topic_subscription)
+    end
+  end
 end