fix type error in code and test

lib/gc_index_relay/nostr/pub_event.ex

@@ -30,7 +30,8 @@ defmodule GcIndexRelay.Nostr.PubEvent do
   """
   @spec to_db(t()) :: Ecto.Schema.t()
   def to_db(%__MODULE__{tags: tags} = pub_event) do
-    %Event{to_event(pub_event) | tags: to_tags(tags)}
+    %Event{} = event = to_event(pub_event)
+    %{event | tags: to_tags(tags)}
   end
 
   @spec to_event(t()) :: Ecto.Schema.t()

test/gc_index_relay/nostr/pub_event_test.exs

@@ -152,7 +152,7 @@ defmodule GcIndexRelay.Nostr.PubEventTest do
       pub_event = valid_pub_event_fixture()
       invalid = %{pub_event | id: String.duplicate("zz", 32)}
 
-      assert_raise BadStructError, fn ->
+      assert_raise MatchError, fn ->
         PubEvent.to_db(invalid)
       end
     end
@@ -161,7 +161,7 @@ defmodule GcIndexRelay.Nostr.PubEventTest do
       pub_event = valid_pub_event_fixture()
       invalid = %{pub_event | pubkey: String.duplicate("zz", 32)}
 
-      assert_raise BadStructError, fn ->
+      assert_raise MatchError, fn ->
         PubEvent.to_db(invalid)
       end
     end
@@ -170,7 +170,7 @@ defmodule GcIndexRelay.Nostr.PubEventTest do
       pub_event = valid_pub_event_fixture()
       invalid = %{pub_event | sig: String.duplicate("zz", 64)}
 
-      assert_raise BadStructError, fn ->
+      assert_raise MatchError, fn ->
         PubEvent.to_db(invalid)
       end
     end