Persist telemetry data in local sqlite database

priv/telemetry_repo/migrations/20260305115929_create_telemetry_datapoints.exs

@@ -0,0 +1,15 @@
+defmodule MusicLibrary.TelemetryRepo.Migrations.CreateTelemetryDatapoints do
+  use Ecto.Migration
+
+  def change do
+    create table(:telemetry_datapoints) do
+      add :metric_key, :text, null: false
+      add :label, :text
+      add :measurement, :real, null: false
+      add :time, :integer, null: false
+    end
+
+    # Serves read queries (ORDER BY time) and prune subselect (ORDER BY id DESC)
+    create index(:telemetry_datapoints, [:metric_key, :time])
+  end
+end