Self-hosted v4: ClickHouse guardrail errors are retried while still running, and several UI queries ignore the selected time range

这个问题出现在自托管 Langfuse v4(events-only 写入模式、ClickHouse 资源有限)的日常使用中:会话表、评估器列表和 Dashboard 会返回资源护栏报错,同时点击重查询还会在自托管 ClickHouse 上持续运行并被重试放大。优先排查两点:前端对 422 查询的重
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