diff --git a/lib/pinchflat/media/media_item.ex b/lib/pinchflat/media/media_item.ex
index 0f19bf2..8e9d5bf 100644
--- a/lib/pinchflat/media/media_item.ex
+++ b/lib/pinchflat/media/media_item.ex
@@ -7,6 +7,8 @@ defmodule Pinchflat.Media.MediaItem do
   @required_fields ~w(media_id channel_id)a
   @allowed_fields ~w(title media_id video_filepath channel_id)a
 
+  # TODO: consider making an attached `metadata` model to store the JSON response from whatever backend is used
+
   schema "media_items" do
     field :title, :string
     field :media_id, :string
@@ -22,5 +24,6 @@ defmodule Pinchflat.Media.MediaItem do
     media_item
     |> cast(attrs, @allowed_fields)
     |> validate_required(@required_fields)
+    |> unique_constraint([:media_id, :channel_id])
   end
 end
diff --git a/lib/pinchflat/media_client/backends/yt_dlp/channel.ex b/lib/pinchflat/media_client/backends/yt_dlp/channel.ex
index 39d7348..b83093e 100644
--- a/lib/pinchflat/media_client/backends/yt_dlp/channel.ex
+++ b/lib/pinchflat/media_client/backends/yt_dlp/channel.ex
@@ -15,7 +15,7 @@ defmodule Pinchflat.MediaClient.Backends.YtDlp.Channel do
 
   Returns {:ok, %ChannelDetails{}} | {:error, any, ...}.
   """
-  def get_channel_info(channel_url) do
+  def get_channel_details(channel_url) do
     opts = [print: "%(.{channel,channel_id})j", playlist_end: 1]
 
     with {:ok, output} <- backend_runner().run(channel_url, opts),
diff --git a/lib/pinchflat/media_client/channel_details.ex b/lib/pinchflat/media_client/channel_details.ex
index 3e952bf..0e30e43 100644
--- a/lib/pinchflat/media_client/channel_details.ex
+++ b/lib/pinchflat/media_client/channel_details.ex
@@ -21,7 +21,14 @@ defmodule Pinchflat.MediaClient.ChannelDetails do
   Returns {:ok, map()} | {:error, any, ...}.
   """
   def get_channel_details(channel_url, backend \\ :yt_dlp) do
-    channel_module(backend).get_channel_info(channel_url)
+    channel_module(backend).get_channel_details(channel_url)
+  end
+
+  @doc """
+  TODO: test
+  """
+  def get_video_ids(channel_url, backend \\ :yt_dlp) do
+    channel_module(backend).get_video_ids(channel_url)
   end
 
   defp channel_module(backend) do
diff --git a/lib/pinchflat/media_source.ex b/lib/pinchflat/media_source.ex
index 6b98bf7..33d0ec2 100644
--- a/lib/pinchflat/media_source.ex
+++ b/lib/pinchflat/media_source.ex
@@ -6,6 +6,7 @@ defmodule Pinchflat.MediaSource do
   import Ecto.Query, warn: false
   alias Pinchflat.Repo
 
+  alias Pinchflat.Media
   alias Pinchflat.MediaSource.Channel
   alias Pinchflat.MediaClient.ChannelDetails
 
@@ -32,6 +33,28 @@ defmodule Pinchflat.MediaSource do
     |> Repo.insert()
   end
 
+  @doc """
+  Given a media source, creates (indexes) the media by creating media_items for each
+  media ID in the source.
+
+  Returns [%MediaItem{}, ...] | [%Ecto.Changeset{}, ...]
+
+  TODO: test
+  """
+  def index_media_items(%Channel{} = channel) do
+    {:ok, media_ids} = ChannelDetails.get_video_ids(channel.original_url)
+
+    media_ids
+    |> Enum.map(fn media_id ->
+      attrs = %{channel_id: channel.id, media_id: media_id}
+
+      case Media.create_media_item(attrs) do
+        {:ok, media_item} -> media_item
+        {:error, changeset} -> changeset
+      end
+    end)
+  end
+
   @doc """
   Updates a channel. Returns {:ok, %Channel{}} | {:error, %Ecto.Changeset{}}
   """
diff --git a/priv/repo/migrations/20240125025325_create_media_items.exs b/priv/repo/migrations/20240125025325_create_media_items.exs
index c02e6e7..cfaa25f 100644
--- a/priv/repo/migrations/20240125025325_create_media_items.exs
+++ b/priv/repo/migrations/20240125025325_create_media_items.exs
@@ -12,6 +12,6 @@ defmodule Pinchflat.Repo.Migrations.CreateMediaItems do
     end
 
     create index(:media_items, [:channel_id])
-    create unique_index(:media_items, [:channel_id, :media_id])
+    create unique_index(:media_items, [:media_id, :channel_id])
   end
 end
diff --git a/test/pinchflat/media_client/backends/yt_dlp/channel_test.exs b/test/pinchflat/media_client/backends/yt_dlp/channel_test.exs
index 3e12a6c..14cc187 100644
--- a/test/pinchflat/media_client/backends/yt_dlp/channel_test.exs
+++ b/test/pinchflat/media_client/backends/yt_dlp/channel_test.exs
@@ -9,13 +9,13 @@ defmodule Pinchflat.MediaClient.Backends.YtDlp.ChannelTest do
 
   setup :verify_on_exit!
 
-  describe "get_channel_info/1" do
+  describe "get_channel_details/1" do
     test "it returns a %ChannelDetails{} with data on success" do
       expect(YtDlpRunnerMock, :run, fn _url, _opts ->
         {:ok, "{\"channel\": \"TheUselessTrials\", \"channel_id\": \"UCQH2\"}"}
       end)
 
-      assert {:ok, res} = Channel.get_channel_info(@channel_url)
+      assert {:ok, res} = Channel.get_channel_details(@channel_url)
       assert %ChannelDetails{id: "UCQH2", name: "TheUselessTrials"} = res
     end
 
@@ -26,19 +26,19 @@ defmodule Pinchflat.MediaClient.Backends.YtDlp.ChannelTest do
         {:ok, "{}"}
       end)
 
-      assert {:ok, _} = Channel.get_channel_info(@channel_url)
+      assert {:ok, _} = Channel.get_channel_details(@channel_url)
     end
 
     test "it returns an error if the runner returns an error" do
       expect(YtDlpRunnerMock, :run, fn _url, _opts -> {:error, "Big issue", 1} end)
 
-      assert {:error, "Big issue", 1} = Channel.get_channel_info(@channel_url)
+      assert {:error, "Big issue", 1} = Channel.get_channel_details(@channel_url)
     end
 
     test "it returns an error if the output is not JSON" do
       expect(YtDlpRunnerMock, :run, fn _url, _opts -> {:ok, "Not JSON"} end)
 
-      assert {:error, %Jason.DecodeError{}} = Channel.get_channel_info(@channel_url)
+      assert {:error, %Jason.DecodeError{}} = Channel.get_channel_details(@channel_url)
     end
   end
 end