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docs: Phase 2c 设计文档补充 — @计数存储/系统消息格式/离线推送/错误常量

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- 新增 at_me_count 字段设计（im_conversation_members）
- 明确系统消息 content 格式为纯文本 + 12 种消息模板
- 群聊离线推送策略（沿用 Phase 2b OfflineMessagePusher）
- 文件上传策略（两步解耦，无需接口注入）
- 群聊错误常量规划（15 个业务错误）

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bujinyuan
2026-03-04 10:37:48 +08:00
parent 86f371cc5c
commit cc09b192a4
2 changed files with 89 additions and 1 deletions
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docs/plans/2026-03-04-phase2c-implementation.plan.md
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@@ -75,7 +75,7 @@
- `im_message_reads` 表
2. **ALTER 现有表**
- `im_conversation_members` 新增 5 字段：role, nickname, is_muted, is_do_not_disturb, joined_at
- `im_conversation_members` 新增 6 字段：role, nickname, is_muted, is_do_not_disturb, joined_at, at_me_count
- `im_messages` 新增 1 字段：at_user_ids (BIGINT[])
3. **Go Model 文件**