feat: create standalone native fnOS repository
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-- 指标历史:按 (scope, metric) 纵向存点,避免「每加一个指标就改一次表结构」。
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-- scope 形如 host / server:3 / route:3:example.com;采样跟随巡检轮次(2 分钟)。
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-- 行量很小(本机 3 条指标约每天 2160 行),因此不做降采样表,查询时按桶取平均。
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CREATE TABLE IF NOT EXISTS metrics_samples (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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scope TEXT NOT NULL,
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metric TEXT NOT NULL,
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value REAL NOT NULL,
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at TEXT NOT NULL
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);
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CREATE INDEX IF NOT EXISTS idx_metrics_samples_lookup ON metrics_samples(scope, metric, at);
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