Improve episode-level compatability with media center apps (#86)

* Add media profile presets (#85)

* Added presets for output templates

* Added presets for the entire media profile form

* Append `-thumb` to thumbnails when downloading (#87)

* Appended -thumb to thumbnails when downloading

* Added code to compensate for yt-dlp bug

* Squash all the commits from the other branch bc I broke things (#88)

lib/pinchflat/metadata/source_metadata.ex

@@ -0,0 +1,36 @@
+defmodule Pinchflat.Metadata.SourceMetadata do
+  @moduledoc """
+  The SourceMetadata schema.
+
+  Look. Don't @ me about Metadata vs. Metadatum. I'm very sensitive.
+  """
+
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  alias Pinchflat.Sources.Source
+
+  @allowed_fields ~w(metadata_filepath)a
+  @required_fields ~w(metadata_filepath)a
+
+  schema "source_metadata" do
+    field :metadata_filepath, :string
+
+    belongs_to :source, Source
+
+    timestamps(type: :utc_datetime)
+  end
+
+  @doc false
+  def changeset(source_metadata, attrs) do
+    source_metadata
+    |> cast(attrs, @allowed_fields)
+    |> validate_required(@required_fields)
+    |> unique_constraint([:source_id])
+  end
+
+  @doc false
+  def filepath_attributes do
+    ~w(metadata_filepath)a
+  end
+end