Introduce separate search index

Uses a fts5 virtual table, kept up to date via triggers on the records
table.

lib/music_library/records/search_index.ex

@@ -0,0 +1,30 @@
+defmodule MusicLibrary.Records.SearchIndex do
+  use Ecto.Schema
+
+  @formats [:cd, :vinyl, :blu_ray, :dvd, :multi]
+  @types [:album, :ep, :live, :compilation, :single, :other]
+
+  # q = from s in MusicLibrary.Records.SearchIndex,
+  # where: fragment("records_index = 'lex*'"), select: s.id
+
+  @primary_key {:id, :binary_id, autogenerate: false}
+  schema "records_search_index" do
+    field :type, Ecto.Enum, values: @types
+    field :format, Ecto.Enum, values: @formats
+    field :title, :string
+    field :musicbrainz_id, Ecto.UUID
+    field :genres, {:array, :string}
+    field :release, :string
+    field :purchased_at, :utc_datetime
+    field :cover_hash, :string
+    field :release_ids, {:array, :string}, default: []
+    field :included_release_group_ids, {:array, :string}, default: []
+
+    embeds_many :artists, Artist do
+      field :name, :string
+      field :sort_name, :string
+      field :disambiguation, :string
+      field :musicbrainz_id, Ecto.UUID
+    end
+  end
+end