feat: Reset an user's memory (quicker approach to delete all memories)

[audreycs]

Pre-submission checklist | 提交前检查

• I have searched existing issues and this hasn't been mentioned before | 我已搜索现有问题，确认此问题尚未被提及
• I have read the project documentation and confirmed this issue doesn't already exist | 我已阅读项目文档并确认此问题尚未存在
• This issue is specific to MemOS and not a general software issue | 该问题是针对 MemOS 的，而不是一般软件问题

Problem Statement | 问题陈述

Hi, I wonder if there is a feature to remove all memories of an user by the user_id, or removing a conversation memories by conversation id. Currently, if I want to remove all memories (a.k.a. reset user's memory), I need to:

1. search for all memories and get their memory id. get_memory()
2. delete memory by its memory id one by one. delete_memory()

The first step "search" takes a long time. For example, it can take 142 seconds to search 793 memories then delete them. I wonder if there is a quicker approach to reset a user's memory.

Thanks!

Willingness to Implement | 实现意愿

• I'm willing to implement this myself | 我愿意自己解决
• I would like someone else to implement this | 我希望其他人来解决