add context notes

lib/memex/contexts/context_note.ex

@@ -0,0 +1,21 @@
+defmodule Memex.Contexts.ContextNote do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  @primary_key {:id, :binary_id, autogenerate: true}
+  @foreign_key_type :binary_id
+  schema "context_notes" do
+
+    field :context_id, :binary_id
+    field :note_id, :binary_id
+
+    timestamps()
+  end
+
+  @doc false
+  def changeset(context_note, attrs) do
+    context_note
+    |> cast(attrs, [])
+    |> validate_required([])
+  end
+end

priv/repo/migrations/20220726002129_create_context_notes.exs

@@ -0,0 +1,16 @@
+defmodule Memex.Repo.Migrations.CreateContextNotes do
+  use Ecto.Migration
+
+  def change do
+    create table(:context_notes, primary_key: false) do
+      add :id, :binary_id, primary_key: true
+      add :context_id, references(:contexts, on_delete: :nothing, type: :binary_id)
+      add :note_id, references(:notes, on_delete: :nothing, type: :binary_id)
+
+      timestamps()
+    end
+
+    create index(:context_notes, [:context_id])
+    create index(:context_notes, [:note_id])
+  end
+end