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create: Checkpoint 2026-09-29 15:55:01 UTC [a883cdb54c]

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MemRelay-Operation: checkpoint-save:nixmsg-ckpt-20260929-1555
MemRelay-Resource: 4b8a0222-20d3-4531-98b1-4b735b3ef70e
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memrelay
2026-09-29 23:55:03 +08:00
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---
title: Checkpoint 2026-09-29 15:55:01 UTC [a883cdb54c]
type: checkpoint
permalink: main/projects/25464650-ed5d-440e-b362-190f2852d451/checkpoint-2026-09-29-15-55-01-utc-a883cdb54c
stable_id: 4b8a0222-20d3-4531-98b1-4b735b3ef70e
scope: project
memory_type: checkpoint
project_id: 25464650-ed5d-440e-b362-190f2852d451
usage_profile_id: 0c9feb46-d06e-43cd-9ef0-c5813c84a998
status: active
revision: 1
request_id: nixmsg-ckpt-20260929-1555
created_at: '2026-09-29T15:55:01.068377+00:00'
updated_at: '2026-09-29T15:55:01.068377+00:00'
tags:
- nixmsg
- design
---
完成：用户询问离线邮箱能否改用 Redis。已回复建议：单机、1000 设备以内，离线消息是唯一副本，继续用 SQLite。Redis 只能替换邮箱存储，在线传输仍然是 Mosquitto；若改用必须开 AOF，每条消息的 TTL 仍要自己扫，代码量差不多，多一个服务。仅当机器已有 Redis，或管理服务要多进程共享邮箱时再换。
原因：用户对 SQLite 选型有疑问。
验证：未写代码。
下一步：等用户确认邮箱用 SQLite 还是 Redis，再说是否开工。未确认前不要把 Redis 写成已裁定决定。
给下个会话：项目 ID 25464650-ed5d-440e-b362-190f2852d451，目录 e:/code/NixMsg，需求记忆 9cea62eb-5435-4fb1-af51-9699bb182b1a revision 2。