this.userId = userId;
    }

    /**
     * Gets the creation timestamp.
     *
     * @return the creation timestamp
     */
    public LocalDateTime getCreatedAt() {
        return createdAt;
    }

    /**
     * Sets the creation timestamp.
     *
     * @param createdAt the creation timestamp
     */

    public void test_defaultConstructor() {
        final ChatSession session = new ChatSession();
        assertNotNull(session.getSessionId());
        assertNull(session.getUserId());
        assertNotNull(session.getCreatedAt());
        assertNotNull(session.getLastAccessedAt());
        assertNotNull(session.getMessages());
        assertTrue(session.getMessages().isEmpty());
    }

    @Test

                        final UserInfo oldUserInfo = userInfoMap.get(code);
                        if (oldUserInfo != null) {
                            userInfo.setCreatedAt(oldUserInfo.getCreatedAt());
                        }
                        userInfoMap.put(code, userInfo);
                    });
                    searchLogList.add(searchLog);
                }
            }