from typing import Optional, Dict

def get_classement_by_tag(cur, classement_table: str, tag: str) -> Optional[Dict]:
    pattern = f"%*{tag}*%"
    sql = f"""
        SELECT cla_info_dossard, con_id, cla_list_tag
        FROM `{classement_table}`
        WHERE cla_list_tag LIKE %s
        LIMIT 1
    """
    cur.execute(sql, (pattern,))
    return cur.fetchone()