Рабочая сборка второго executor'а

src/DAO/MySQLUserDAO.cpp

@@ -29,7 +29,7 @@ string MySQLUserDAO::Create(const User& created_user)
   return uuid_str;
 }
 
-optional<User> MySQLUserDAO::GetByUUID(string uuid)
+optional<User> MySQLUserDAO::GetByUUID(const string& uuid)
 {
   mysqlx::SqlResult sql_result = session_.
                                  sql("SELECT * FROM `up_and_down`.`users` WHERE (uuid = '" + uuid +
@@ -38,7 +38,7 @@ optional<User> MySQLUserDAO::GetByUUID(string uuid)
   return GetSingleUserBySQLResult(std::move(sql_result));
 }
 
-optional<User> MySQLUserDAO::GetByLogin(string login)
+optional<User> MySQLUserDAO::GetByLogin(const string& login)
 {
   mysqlx::SqlResult sql_result = session_.
                                  sql("SELECT * FROM `up_and_down`.`users` WHERE (login = '" + login
@@ -105,7 +105,7 @@ bool MySQLUserDAO::Update(const User& u)
   return !!res.getAffectedItemsCount();
 }
 
-bool MySQLUserDAO::Delete(string uuid)
+bool MySQLUserDAO::Delete(const string& uuid)
 {
   auto schema = session_.getSchema("up_and_down");
   auto table  = schema.getTable("users");