freedak
f7a720204a
- 移除 GovAI, nomifun-tauri, 算力盒子 的 submodule 引用 - 添加所有子项目的完整源代码 - 保留原始 .git 为 .git.bak 备份
23 lines
1.1 KiB
SQL
23 lines
1.1 KiB
SQL
-- Keyset (cursor) pagination for conversation message history.
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--
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-- An ever-growing single conversation — notably a desktop companion's ONE
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-- session, which now also absorbs every IM-channel turn — is loaded in
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-- newest-first windows via a (created_at, id) keyset cursor instead of one
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-- giant fetch:
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--
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-- SELECT * FROM messages
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-- WHERE conversation_id = ?
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-- AND type NOT IN ('cron_trigger','skill_suggest')
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-- AND (created_at < ? OR (created_at = ? AND id < ?))
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-- ORDER BY created_at DESC, id DESC
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-- LIMIT ?
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--
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-- The existing idx_messages_conv_created / idx_messages_conv_created_desc cover
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-- (conversation_id, created_at) but NOT the `id` tiebreaker, so the cursor's
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-- (created_at, id) comparison and the matching ORDER BY degrade to a sort. This
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-- composite covers both, keeping deep "load older" pages index-only and stable
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-- under concurrent streaming appends. `id` is msg_{uuidv7} (time-ordered), so it
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-- is a sound, monotonic tiebreaker for rows sharing a created_at millisecond.
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CREATE INDEX IF NOT EXISTS idx_messages_conv_created_id
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ON messages (conversation_id, created_at DESC, id DESC);
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