add context notes

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