Added an index to help speed up recent queries

src/main/java/org/qortal/repository/hsqldb/HSQLDBDatabaseUpdates.java

@@ -922,6 +922,8 @@ public class HSQLDBDatabaseUpdates {
 					stmt.execute("ALTER TABLE ArbitraryTransactions ADD compression INTEGER NOT NULL DEFAULT 0");
 					// For finding transactions by registered name
 					stmt.execute("CREATE INDEX ArbitraryNameIndex ON ArbitraryTransactions (name)");
+					// For finding transactions by registered name and service
+					stmt.execute("CREATE INDEX ArbitraryNameServiceIndex ON ArbitraryTransactions (name, service)");
 					break;
 
 				case 39: