Implement MIP-00 keypackage envelope validation

priv/repo/migrations/20260313205257_add_event_tags_i_lookup_index.exs

@@ -0,0 +1,13 @@
+defmodule Parrhesia.Repo.Migrations.AddEventTagsILookupIndex do
+  use Ecto.Migration
+
+  def up do
+    execute(
+      "CREATE INDEX event_tags_i_value_created_at_idx ON event_tags (value, event_created_at DESC) WHERE name = 'i'"
+    )
+  end
+
+  def down do
+    execute("DROP INDEX event_tags_i_value_created_at_idx")
+  end
+end