18 lines
612 B
SQL
18 lines
612 B
SQL
-- 消息表
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CREATE TABLE IF NOT EXISTS messages (
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id BIGSERIAL PRIMARY KEY,
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session_id UUID NOT NULL,
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role VARCHAR(16) NOT NULL, -- "user" | "assistant" | "system"
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content TEXT NOT NULL,
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tokens_used INTEGER NOT NULL DEFAULT 0,
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created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
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);
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-- 按会话查询消息（分页核心索引）
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CREATE INDEX IF NOT EXISTS idx_messages_session_id_created_at
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ON messages(session_id, created_at);
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-- 按会话查询最后一条消息
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CREATE INDEX IF NOT EXISTS idx_messages_session_id_id_desc
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ON messages(session_id, id DESC);
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