Add a migration for native_stats_start_at (#2716)

priv/repo/migrations/20230301095227_add_native_stats_start_date.exs

@@ -0,0 +1,23 @@
+defmodule Plausible.Repo.Migrations.AddNativeStatsStartDate do
+  use Ecto.Migration
+
+  def up do
+    alter table(:sites) do
+      add :native_stats_start_at, :naive_datetime, null: true
+    end
+
+    execute """
+    UPDATE sites SET native_stats_start_at = inserted_at
+    """
+
+    alter table(:sites) do
+      modify :native_stats_start_at, :naive_datetime, null: false, default: fragment("now()")
+    end
+  end
+
+  def down do
+    alter table(:sites) do
+      remove :native_stats_start_at
+    end
+  end
+end