Database technology startup ClickHouse Inc. has nearly tripled its valuation to $6.35 billion in a new funding round, according to a person familiar with the matter — underscoring investors’ enthusiasm for companies that will power the use of artificial intelligence. Khosla Ventures led the $350 million financing, ClickHouse plans to announce Thursday. The startup’s data platform, which targets fast and cheap responses to queries, will help companies run and build AI tools, in addition to other ...