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https://scalegrid.io/blog/managing-high-availability-in-postgresql-part-1/%EF%BC%89%E4%B8%AD%E7%9A%84%E7%AC%AC%E4%B8%89%E6%96%B9%E5%B7%A5%E5%85%B7%E7%B3%BB%E5%88%97%E4%BA%86%E8%A7%A3%E5%88%B0%E6%9B%B4%E5%A4%9A%E5%BC%80%E6%BA%90%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88%E3%80%82