fix race condition on 43 msg creation/closure. Speed up game object insert to db (from 10-12s to 1-2s)

db/migrations/000002_create_game.up.sql

@@ -268,7 +268,7 @@ CREATE TABLE IF NOT EXISTS ownership_string (
     key_ VARCHAR(128) NOT NULL,
     value INTEGER NOT NULL,
 
-    card_deck_id TEXT UNIQUE,
+    card_deck_id TEXT,
     FOREIGN KEY (card_deck_id) REFERENCES card_deck(id) ON DELETE CASCADE
 );