DB接続失敗3(query). shift_tbl SQLSTATE[HY000]: General error: 2006 MySQL server has gone away||SELECT 
                        * 
                    FROM 
                        shift_tbl, 
                        admin_user_tbl 
                    where 
                        shift_tbl.admin_user_id = admin_user_tbl.admin_user_id AND 
                        date_format(shift_start,'%Y-%m-%d') = '2025-04-02' AND 
                        admin_user_tbl.admin_user_type_id in (3,4)